With the CLI command bumpver, you can search for and update version strings in your project files. It has a flexible pattern syntax to support many version schemes (SemVer, CalVer or otherwise). BumpVer features:

• Configurable version patterns
• Optional Git or Mercurial integration
• Works with plaintext, so you can use it with any project.

Project/Repo:

Code Quality/CI:

• Overview
  • Search and Replace
  • Name Change PyCalVer -> BumpVer
  • Related Projects/Alternatives
• Example Usage
  • Testing a version_pattern
  • Using MAJOR/MINOR/PATCH (SemVer Parts)
  • Auto Increment Parts: BUILD/INC0/INC1
  • Persistent Parts: BUILD/TAG/PYTAG
  • Searching for Patterns with grep
• Reference
  • Command Line
  • Part Overview
  • Normalization Caveats
  • Pattern Examples
  • Week Numbering
• Configuration
  • Configuration Setup
  • Debugging Configuration
• Bump It Up
  • Version State
  • The Current Version
  • Dry Mode
  • VCS Parameters (git/mercurial)

With bumpver, you configure a single version_pattern which is then used to

1. Search for version strings in your project files
2. Replace these with an updated/bumped version number.

Your configuration might look something like this:

# pyproject.toml
[bumpver]
current_version = "1.5.2"
version_pattern = "MAJOR.MINOR.PATCH"

[bumpver.file_patterns]
"setup.py" = [
    'version="{version}",$',
]
"src/mymodule/__init__.py" = [
    '^__version__ = "{version}"$',
]

Using this configuration, the output of bumpver update --dry might look something like this:

$ bumpver update --patch --dry
INFO    - Old Version: 1.5.2
INFO    - New Version: 1.5.3
--- setup.py
+++ setup.py
@@ -63,7 +63,7 @@
     name="mymodule",
-    version="1.5.2",
+    version="1.5.3",
     description=description,

--- src/mymodule/__init__.py
+++ src/mymodule/__init__.py
@@ -3,3 +3,3 @@

-__version__ = "1.5.2"
+__version__ = "1.5.3"

This project was originally developed under the name PyCalVer, with the intent to support various CalVer schemes. The package has since been renamed from PyCalVer to BumpVer and the CLI command from pycalver to bumpver.

This name change is to reduce confusion that this project is only suitable for Python projects or only for CalVer versioning schemes, neither of which is the case.

If you are looking for an alternative, BumpVer was heavily influenced by bumpversion/bump2version. You may also wish to take a look at their list of related projects: bump2version/RELATED.md

You can override the date used by bumpver with the --date=<isodate> option. Adding this every time would be distracting, so the examples assume the following date:

$ date --iso
2020-10-15

To test a version_pattern and how to increment it, you can use bumpver test:

$ bumpver test 'v2020.37' 'vYYYY.WW'
New Version: v2020.41

A version_pattern consists of three kinds of characters:

• Literal text, such as v, ., and -, typically used as delimiters.
• A valid part such as YYYY/WW in the previous example.
• Square brackets [] to mark an optional segment.

The following example uses all three: vYYYY.WW[-TAG]

               vYYYY.WW[-TAG]
literal text   ^    ^   ^

$ bumpver test 'v2020.37-beta' 'vYYYY.WW[-TAG]'
New Version: v2020.41-beta
PEP440     : 2020.41b0

Here we see the week number changed from 37 to 41. The test command also shows the normalized version pattern according to PEP440. This removes the "v" prefix and shortens the release tag from -beta to b0.

To remove the release tag, use the option --tag=final.

$ bumpver test 'v2020.37-beta' 'vYYYY.WW[-TAG]' --tag=final
New Version: v2020.41
PEP440     : 2020.41

A CalVer version_pattern may not require any flags to determine which part should be incremented, so long as the date has changed. With SemVer you must always specify one of --major/--minor/--patch.

$ bumpver test '1.2.3' 'MAJOR.MINOR.PATCH[PYTAGNUM]' --major
New Version: 2.0.0

$ bumpver test '1.2.3' 'MAJOR.MINOR.PATCH[PYTAGNUM]' --minor
New Version: 1.3.0

$ bumpver test '1.2.3' 'MAJOR.MINOR.PATCH[PYTAGNUM]' --patch
New Version: 1.2.4

$ bumpver test '1.2.3' 'MAJOR.MINOR.PATCH[PYTAGNUM]' --patch --tag=beta
New Version: 1.2.4b0

$ bumpver test '1.2.4b0' 'MAJOR.MINOR.PATCH[PYTAGNUM]' --tag-num
New Version: 1.2.4b1

These non date based parts also make sense for a CalVer version_pattern, so that you can create multiple releases in the same month. It is common to include e.g. a PATCH part.

$ bumpver test '2020.10.0' 'YYYY.MM.PATCH' --patch
New Version: 2020.10.1

Without this flag, we would get an error if the date is still in October.

$ date --iso
2020-10-15

$ bumpver test '2020.10.0' 'YYYY.MM.PATCH'
ERROR   - Invalid arguments or pattern, version did not change.
ERROR   - Version did not change: '2020.10.0'. Invalid version and/or pattern 'YYYY.MM.PATCH'.
INFO    - Perhaps try: bumpver test --patch

Once the date is in November, the PATCH part will roll over back to zero. This happens whenever parts to the left change (in this case the year and month), just as it does if MAJOR or MINOR were incremented in SemVer.

$ bumpver test '2020.10.1' 'YYYY.MM.PATCH' --date 2020-11-01
New Version: 2020.11.0

The rollover to zero will happen even if you use the --patch argument, so that your first release in a month will always have a PATCH set to 0 instead of 1. You can make the PATCH part optional with [.PATCH] and always supply the --patch flag in your build script. This will cause the part to be omitted when 0 and added when > 0.

$ bumpver test '2020.9.1' 'YYYY.MM[.PATCH]' --patch
New Version: 2020.10

$ bumpver test '2020.10' 'YYYY.MM[.PATCH]' --patch
New Version: 2020.10.1

$ bumpver test '2020.10.1' 'YYYY.MM[.PATCH]' --patch
New Version: 2020.10.2

With CalVer, the version is based on a calendar date, so you only have to specify such flags if you've already published a release for the current date. Without such a flag, BumpVer will show the error, that the "version did not change".

$ bumpver test 'v2020.41-beta0' 'vYYYY.WW[-TAGNUM]'
ERROR   - Invalid arguments or pattern, version did not change.
ERROR   - Invalid version 'v2020.41-beta0' and/or pattern 'vYYYY.WW[-TAGNUM]'.

In this case you have to change one of the parts that are not based on a calendar date.

$ bumpver test 'v2020.41-beta0' 'vYYYY.WW[-TAGNUM]' --tag-num
New Version: v2020.41-beta1
PEP440     : 2020.41b1

$ bumpver test 'v2020.41-beta0' 'vYYYY.WW[-TAGNUM]' --tag=final
New Version: v2020.41
PEP440     : 2020.41

If a pattern is not applicable to a version string, then you will get an error message.

$ bumpver test '2020.37' 'YYYY.MM'     # expected to fail because 37 is not valid for part MM
ERROR   - Incomplete match '2020.3' for version string '2020.37' with pattern 'YYYY.MM'/'(?P<year_y>[1-9][0-9]{3})\.(?P<month>1[0-2]|[1-9])'
ERROR   - Invalid version '2020.37' and/or pattern 'YYYY.MM'.

This illustrates that each pattern is internally translated to a regular expression which must match the version string. The --verbose flag will show a verbose form of the regular expression, which may help to debug the discrepancy between the pattern and the version.

$ bumpver test 'v2020.37' 'YYYY.WW' --verbose  # missing "v" prefix
INFO    - Using pattern YYYY.WW
INFO    - regex = re.compile(r"""
    (?P<year_y>[1-9][0-9]{3})
    \.
    (?P<week_w>5[0-2]|[1-4][0-9]|[0-9])
""", flags=re.VERBOSE)
ERROR   - Invalid version string 'v2020.37' for pattern ...

To fix the above, you can either remove the "v" prefix from the version or add it to the pattern.

$ bumpver test 'v2020.37' 'vYYYY.WW'   # added "v" prefix
New Version: v2020.41
PEP440     : 2020.41

These parts are incremented automatically, and do not use/require a CLI flag: BUILD/INC0/INC1.

$ bumpver test '2020.10.1' 'YYYY.MM.INC0'
New Version: 2020.10.2

$ bumpver test '2020.10.2' 'YYYY.MM.INC0' --date 2020-11-01
New Version: 2020.11.0

You can make the part optional using the [PART] syntax and it will be added/removed as needed.

$ bumpver test '2020.10' 'YYYY.MM[.INC0]'
New Version: 2020.10.1

$ bumpver test '2020.10.1' 'YYYY.MM[.INC0]' --date 2020-11-01
New Version: 2020.11

You can the BUILD part to maintain lexical ordering of version numbers. This means that the expression older < newer will always be true, whether you are dealing with integers or strings, whether you are using software that understands how to parse version numbers or not.

$ bumpver test '2020.1001' 'YYYY.BUILD'
New Version: 2020.1002

$ bumpver test '2020.1002' 'YYYY.BUILD'
New Version: 2020.1003

$ bumpver test '2020.1999' 'YYYY.BUILD'
New Version: 2020.22000

The BUILD and TAG parts will not rollover/reset. Instead they are carried forward from one version to the next.

$ bumpver test 'v2020.1051-beta' 'vYYYY.BUILD[-TAG]'
New Version: v2020.1052-beta
PEP440     : 2020.1052b0

$ bumpver test 'v2020.1051-beta' 'vYYYY.BUILD[-TAG]' --date 2021-01-01
New Version: v2021.1052-beta
PEP440     : 2021.1052b0

$ bumpver test 'v2020.1051-beta' 'vYYYY.BUILD[-TAG]' --tag=rc
New Version: v2020.1052-rc
PEP440     : 2020.1052rc0

To remove a release tag, mark it as final with --tag=final.

$ bumpver test 'v2020.1051-beta' 'vYYYY.BUILD[-TAG]' --tag=final
New Version: v2020.1052
PEP440     : 2020.1052

If the various automatic version incrementing methods don't work for you, you can explicitly do --set-version=<version>.

$ bumpver update --dry --set-version="v2020.1060"
INFO    - Old Version: v2020.1051-beta
INFO    - New Version: v2020.1060
--- setup.py
+++ setup.py
@@ -63,7 +63,7 @@
     name="mymodule",
-    version="2020.1051b0",
+    version="2020.1060",
     description=description,

--- src/mymodule/__init__.py
+++ src/mymodule/__init__.py
@@ -3,3 +3,3 @@

-__version__ = "v2020.1051-beta"
+__version__ = "v2020.1060"

You can use bumpver grep to test and debug entries for your configuration.

$ bumpver grep \
	'__version__ = "YYYY.MM[-TAGNUM]"' \
	src/module/__init__.py

 3:
 4: __version__ = "2020.9-beta1"
 5:

When searching your project files for version strings, there are some limitations to keep in mind:

1. A version string cannot span multiple lines.
2. Brackets [] can be escaped with backslash: \[\].
3. There is no way to escape a valid part (so you cannot match the literal text YYYY).

Note that everything in the pattern is treated as literal text, except for a valid part (in all caps).

              __version__ = "YYYY.MM[-TAGNUM]"
literal text  ^^^^^^^^^^^^^^^    ^   ^       ^

When you write your configuration, you can avoid repeating your version pattern in every search pattern, by using these placeholders

• {version}
• {pep440_version}

Applied to the above example, you can instead write this:

$ bumpver grep \
  --version-pattern "YYYY.MM[-TAGNUM]"  \
  '__version__ = "{version}"' \
  src/module/__init__.py

 3:
 4: __version__ = "2020.9-beta1"
 5:

The corresponding configuration would look like this.

[bumpver]
current_version = "2020.9-beta1"
version_pattern = "YYYY.MM[-TAGNUM]"
...

[bumpver:file_patterns]
src/module/__init__.py
  __version__ = "{version}"
...

If you use a version pattern that is not in the PEP440 normalized form (such as the one above), you can nonetheless match version strings in your project files which are in the PEP440 normalized form. To do this, you can use the placeholder {pep440_version} instead of the {version} placeholder.

$ bumpver grep --version-pattern "YYYY.MM[-TAGNUM]" 'version="{pep440_version}"' setup.py
setup.py
  65:     url="https://github.com/org/project",
  66:     version="2020.9b1",
  67:     description=description,

The placeholder {version} matches 2020.9-beta1, while the placeholder {pep440_version} matches 2020.9b1 (excluding the "v" prefix, the "-" separator and with a short form release tag "b1" instead of "beta1"). These two placeholders make it possible to mostly use your preferred format for version strings, but use a PEP440 compliant/normalized version string where appropriate.

As a neat trick further illustration of how the search and replace works, you might wish to keep the year of your copyright headers up to date.

$ bumpver grep 'Copyright (c) 2018-YYYY' src/mymodule/*.py | head
src/mymodule/__init__.py
   3:
   4: # Copyright (c) 2018-2020 Vandelay Industries - All rights reserved.
   5:

src/mymodule/config.py
   3:
   4: # Copyright (c) 2018-2020 Vandelay Industries - All rights reserved.
   5:

The corresponding configuration for this pattern would look like this.

[bumpver:file_patterns]
...
src/mymodule/*.py
  Copyright (c) 2018-YYYY Vandelay Industries - All rights reserved.

Note that there must be a match for every entry in file_patterns. If there is no match, bumpver will show an error. This ensures that a pattern is not skipped when your project changes. In this case the side effect is to make sure that every file has a copyright header.

$ bumpver update --dry
ERROR   - No match for pattern 'Copyright (c) 2018-YYYY Vandelay Industries - All rights reserved.'
ERROR   -
# https://regex101.com/?flavor=python&flags=gmx&regex=Copyright%5B%20%5D%5C%28c%5C%29%0A%5B%20%5D2018%5C-%0A%28%3FP%3Cyear_y%3E%5B1-9%5D%5B0-9%5D%7B3%7D%29%0A%5B%20%5DVandelay%5B%20%5DIndustries%5B%20%5D%5C-%5B%20%5DAll%5B%20%5Drights%5B%20%5Dreserved%5C.
regex = re.compile(r"""
    Copyright[ ]\(c\)
    [ ]2018\-
    (?P<year_y>[1-9][0-9]{3})
    [ ]Vandelay[ ]Industries[ ]\-[ ]All[ ]rights[ ]reserved\.
""", flags=re.VERBOSE)
ERROR   - No patterns matched for file 'src/mymodule/utils.py'

$ bumpver --help
Usage: bumpver [OPTIONS] COMMAND [ARGS]...

  Automatically update version strings in plaintext files.

Options:
  --version      Show the version and exit.
  -v, --verbose  Control log level. -vv for debug level.
  -h, --help     Show this message and exit.

Commands:
  grep    Search file(s) for a version pattern.
  init    Initialize [bumpver] configuration.
  show    Show current version of your project.
  test    Increment a version number for demo purposes.
  update  Update project files with the incremented version string.

$ bumpver update --help
Usage: bumpver update [OPTIONS]

  Update project files with the incremented version string.

Options:
  -d, --dry                       Display diff of changes, don't rewrite
                                  files.
  -f, --fetch / -n, --no-fetch    Sync tags from remote origin.
  -v, --verbose                   Control log level. -vv for debug level.
  --allow-dirty                   Commit even when working directory is has
                                  uncomitted changes. (WARNING: The commit
                                  will still be aborted if there are
                                  uncomitted to files with version strings.
  --ignore-vcs-tag                Ignore VCS tag invariant and update version
                                  anyway.
  --set-version <VERSION>         Set version explicitly.
  --date <ISODATE>                Set explicit date in format YYYY-0M-0D (e.g.
                                  2023-07-10).
  --pin-date                      Leave date components unchanged.
  --pin-increments                Leave the auto-increments INC0 and INC1
                                  unchanged.
  --tag-num                       Increment release tag number (rc1, rc2,
                                  rc3..).
  -t, --tag <NAME>                Override release tag of current_version.
                                  Valid options are: alpha, beta, dev, rc,
                                  post, final.
  -p, --patch                     Increment PATCH component.
  -m, --minor                     Increment MINOR component.
  --major                         Increment MAJOR component.
  -c, --commit-message <TMPL>     Set commit message template.
  --tag-message <TMPL>            Set tag message template.
  --commit / --no-commit          Create a commit with all updated files.
  --tag-commit / --no-tag-commit  Tag the newly created commit.
  --push / --no-push              Push to the default remote.
  --tag-scope [default|global|branch]
                                  Tag scope for the current version.
  --pre-commit-hook <PATH>        Custom script that runs before the commit
                                  step
  --post-commit-hook <PATH>       Custom script that runs after the commit
                                  step is completed
  -h, --help                      Show this message and exit.

To help with shell script automation, you can use bumpver show --env.

$ bumpver show -n --env
YEAR_Y=2020
YEAR_G=
...
TAG=final
...

$ eval $(bumpver show -n --env)
$ echo $TAG
final

Where possible, these patterns match the conventions from CalVer.org.

The following are also available, but you should review the Normalization Caveats before you decide to use them.

• ¹ Monday is the first day of the week.
• ² Sunday is the first day of the week.
• ³ ISO 8601 week. Week 1 contains Jan 4th.

Package managers and installation tools will parse your version numbers. When doing so, your version number may go through a normalization process and may not be exactly as you specified. In the case of Python, the packaging tools (such as pip, twine, setuptools) follow PEP440 normalization rules.

According to these rules (among other things):

• Any non-numerical prefix (such as v) is removed
• Leading zeros in delimited parts are truncated XX.08 -> XX.8
• Tags are converted to a short form (-alpha -> a0)

For example:

• Pattern: vYY.0M.0D[-TAG]
• Version: v20.08.02-beta
• PEP440 : 20.8.2b0

I am not aware of any technical reason to use a normalized representation everywhere in your project. However, if you choose a pattern which is always in a normalized form, it will help to avoid confusion. For example, it may not be obvious at a glance, that v20.08.02-beta is the same as 20.8.2b0 .

A further consideration for the choice of your version_pattern is that it may be processed by tools that do not interpret it as a version number, but treat it just like any other string. It may also be confusing to your users if they a list of version numbers, sorted lexicographically by some tool (e.g. from git tags) and versions are not listed in order of their release:

$ git tag
18.6b4
18.9b0
19.10b0
19.3b0
20.8b0
20.8b1

If you wish to avoid this, you should use a pattern which maintains lexicographical ordering.

• ¹ If PATCH > 9
• ² For the year 2100, the part YY will produce 0

Week numbering is a bit special, as it depends on your definition of "week":

• First day of the week is either Monday or Sunday.
• Range either from 0-52 or 1-53.
• At the beginning/end of the year, you either have partial weeks or a week that spans multiple years.

If you use VV/0V, be aware that you cannot also use YYYY. Instead use GGGG. This is to avoid an edge case where your version number would run backwards if it was created around New Year.

                   YYYY WW UU  GGGG VV
2020-12-26 (Sat):  2020 51 51  2020 52
2020-12-27 (Sun):  2020 51 52  2020 52
2020-12-28 (Mon):  2020 52 52  2020 53
2020-12-29 (Tue):  2020 52 52  2020 53
2020-12-30 (Wed):  2020 52 52  2020 53
2020-12-31 (Thu):  2020 52 52  2020 53
2021-01-01 (Fri):  2021 00 00  2020 53
2021-01-02 (Sat):  2021 00 00  2020 53
2021-01-03 (Sun):  2021 00 01  2020 53
2021-01-04 (Mon):  2021 01 01  2021 01

The create an initial configuration for project with bumpver init.

$ pip install bumpver
...
Installing collected packages: click toml lexid bumpver
Successfully installed bumpver-2023.1127

$ cd myproject
~/myproject/

$ bumpver init --dry
Exiting because of '-d/--dry'. Would have written to bumpver.toml:

    [bumpver]
    current_version = "2020.1001a0"
    version_pattern = "YYYY.BUILD[PYTAGNUM]"
    commit_message = "bump version to {new_version}"
    tag_message = "{new_version}"
    tag_scope = "default"
    pre_commit_hook = ""
    post_commit_hook = ""
    commit = true
    tag = true
    push = true

    [bumpver.file_patterns]
    "README.md" = [
        "{version}",
        "{pep440_version}",
    ]
    "bumpver.toml" = [
        'current_version = "{version}"',
    ]

If you already have configuration file in your project (such as setup.cfg or pyproject.toml), then bumpver init will update that file instead.

~/myproject
$ bumpver init
Updated pyproject.toml

Your pyproject.toml may now look something like this:

[bumpver]
current_version = "2019.1001-alpha"
version_pattern = "YYYY.BUILD[-TAG]"
commit_message = "bump version to {new_version}"
tag_message = "{new_version}"
tag_scope = "default"
pre_commit_hook = ""
post_commit_hook = ""
commit = true
tag = true
push = true

[bumpver.file_patterns]
"pyproject.toml" = [
    'current_version = "{version}"',
]
"setup.py" = [
    'version="{pep440_version}",',
]
"README.md" = [
    '{version}',
    '{pep440_version}',
]

For the entries in [bumpver:file_patterns] you can expect two failure modes:

• False negative: A pattern will not match a version number in the associated file which it should match.
• False positive: A pattern will match something it should not match (less likely).

Most obviously you will see such cases when you first attempt to use bumpver update:

$ bumpver update --dry --no-fetch
INFO    - Old Version: 2020.1001-alpha
INFO    - New Version: 2020.1002-alpha
ERROR   - No match for pattern 'version="YYYY.BUILD[PYTAGNUM]",'
ERROR   -
# https://regex101.com/?flavor=python&flags=gmx&regex=version%3D%5C%22%0A%28%3FP%3Cyear_y%3E%5B1-9%5D%5B0-9%5D%7B3%7D%29%0A%5C.%0A%28%3FP%3Cbid%3E%5B1-9%5D%5B0-9%5D%2A%29%0A%28%3F%3A%0A%20%20%20%20%28%3FP%3Cpytag%3Epost%7Crc%7Ca%7Cb%29%0A%20%20%20%20%28%3FP%3Cnum%3E%5B0-9%5D%2B%29%0A%29%3F%0A%5C%22%2C
regex = re.compile(r"""
    version=\"
    (?P<year_y>[1-9][0-9]{3})
    \.
    (?P<bid>[1-9][0-9]*)
    (?:
        (?P<pytag>post|rc|a|b)
        (?P<num>[0-9]+)
    )?
    \",
""", flags=re.VERBOSE)
ERROR   - No patterns matched for file 'setup.py'

The internally used regular expression is also shown, which you can use to debug the issue, for example on regex101.com.

To debug such issues, you can simplify your pattern and see if you can find a match with bumpver grep .

$ bumpver grep 'YYYY.BUILD[PYTAGNUM]' setup.py
 45:    name='myproject',
 46:    version='2019.1001b0',
 47:    license='MIT',

Here we can see that the pattern for setup.py should be changed to used single quotes instead of doublequotes.

As with bumpver update, if your pattern is not found, bumpver grep will show an error message with the regular expression it uses, to help you debug the issue.

$ bumpver grep 'YYYY.BUILD[PYTAGNUM]' setup.py
ERROR   - Pattern not found: 'YYYY.BUILD[PYTAGNUM]'
# https://regex101.com/...

An example of a more complex pattern is one where you want to keep a version badge in your README up to date.

$ bumpver grep 'shields.io/badge/CalVer-YYYY.BUILD[--TAG]-blue' README.md
  61:
  62: [img_version]: https://img.shields.io/badge/CalVer-2020.1001--beta-blue
  63: [url_version]: https://pypi.org/org/package/

The current_version is considered global state and must be stored somewhere. Typically this might be in a VERSION file, or some other file which is part of the repository. This creates the risk that parallel branches can have different states. If the current_version were defined only by files in the local checkout, the same version might be generated on different systems for different commits.

To avoid this issue, bumpver treats Git/Mercurial tags as a second source, depending on the tag_scope option, for the most recent version and attempts to change this state in the most atomic way possible. This is why some actions of the bumpver command can take a few seconds, as it is synchronizing with the remote repository to get the most recent versions and to push any new version tags as soon as possible.

The current version depends on the configured tag_scope and is either

• Before any tags have been created bumpver will always default to the value of current_version in bumpver.toml / setup.cfg / pyproject.toml.
• Only Git/Mercurial tags which matches the version_pattern from your config will be considered and sorted using pkg_resources.parse_version.

As part of doing bumpver update and bumpver show, your local tags are updated using git fetch --tags/hg pull.

$ bumpver show -vv
2020-10-18T20:20:58.062 DEBUG   bumpver.cli       - Logging configured.
2020-10-18T20:20:58.065 DEBUG   bumpver.config    - Config Parsed: Config(
    ...
2020-10-18T20:20:58.067 DEBUG   bumpver.vcs       - vcs found: git
2020-10-18T20:20:58.067 INFO    bumpver.vcs       - fetching tags from remote (to turn off use: -n / --no-fetch)
2020-10-18T20:20:58.068 DEBUG   bumpver.vcs       - git fetch
2020-10-18T20:21:00.886 DEBUG   bumpver.vcs       - git tag --list
2020-10-18T20:21:00.890 INFO    bumpver.cli       - Latest version from git tag: 2020.1019
Current Version: 2020.1019

Here we see that:

• Git had a newer version than we had locally (2020.1019 vs 2020.1018).
• It took 2 seconds to fetch the tags from the remote repository.

The approach of fetching tags before the version is bumped/incremented, helps to reduce the risk that the newest tag is not known locally. This means that it less likely for the same version to be generated by different systems for different commits. This would result in an ambiguous version tag, which may not be the end of the world, but is better to avoid. Typically this might happen if you have a build system where multiple builds are triggered at the same time.

For a small project (with only one maintainer and no automated packaging) this is a non-issue and you can always use -n/--no-fetch to skip fetching the tags.

Once you have a valid configuration, you can use bumpver update --dry to see the changes it would make (and leave your project files untouched).

$ bumpver update --dry --no-fetch
INFO    - Old Version: 2019.1001-beta
INFO    - New Version: 2019.1002-beta
--- README.md
+++ README.md
@@ -11,7 +11,7 @@

 [![Supported Python Versions][pyversions_img]][pyversions_ref]
-[![Version 2019.1001-beta][version_img]][version_ref]
+[![Version 2019.1002-beta][version_img]][version_ref]
 [![PyPI Releases][pypi_img]][pypi_ref]

--- src/mymodule_v1/__init__.py
+++ src/mymodule_v1/__init__.py
@@ -1,1 +1,1 @@
-__version__ = "2019.1001-beta"
+__version__ = "2019.1002-beta"

--- src/mymodule_v2/__init__.py
+++ src/mymodule_v2/__init__.py
@@ -1,1 +1,1 @@
-__version__ = "2019.1001-beta"
+__version__ = "2019.1002-beta"

--- setup.py
+++ setup.py
@@ -44,7 +44,7 @@
     name="myproject",
-    version="2019.1001b0",
+    version="2019.1002b0",
     license="MIT",

The individual steps performed by bumpver update:

1. Fetch VCS tags from origin.
2. Get most recent version.
3. Generate the updated version string.
4. Check that you have no local changes that are uncommitted.
5. Replace version strings in all files configured in file_patterns.
6. Run pre-commit hook.
7. Commit the updated files.
8. Run post-commit hook.
9. Tag the new commit.
10. Push the new commit and tag.

The configuration for these steps can be done with the following parameters:

• ¹ Available template placeholders: {new_version}, {old_version}, {new_version_pep440}, {old_version_pep440}
• ² Requires commit = True

An example configuration might look like this:

[bumpver]
...
commit_message = "bump version to {new_version}"
tag_message = "{new_version}"
tag_scope = "default"
pre_commit_hook = "scripts/run_checks.sh"
post_commit_hook = "scripts/update_changelog.sh"
commit = True
tag = True
push = True

If everything looks OK, you can do bumpver update.

$ bumpver update --verbose
INFO    - fetching tags from remote (to turn off use: -n / --no-fetch)
INFO    - Old Version: 2020.1005
INFO    - New Version: 2020.1006
INFO    - Run pre-commit hook: scripts/run_checks.sh
INFO    - 	...
INFO    - git commit --message 'bump version to 2020.1006'
INFO    - Run post-commit hook: scripts/update_changelog.sh
INFO    - 	...
INFO    - git tag --annotate 2020.1006 --message 2020.1006
INFO    - git push origin --follow-tags 2020.1006 HEAD

You can also override the config values by passing these command line flags to bumpver update:

In addition to the commit_message configuration, you can also override the string used as the the commit message template with the -c/--commit-message=<TMPL> parameter:

$ bumpver update --tag final --commit-message 'bump version {old_version} -> {new_version} [ci-publish]' --verbose
INFO    - Old Version: 2021.1005b0
INFO    - New Version: 2021.1006
INFO    - git commit --message 'bump version 2020.1005b0 -> 2021.1006 [ci-publish]'
INFO    - git tag --annotate 2020.1006 --message '2020.1006'
INFO    - git push origin --follow-tags 2020.1006 HEAD

As this is a manual operation (rather than a long lived configuration option), you can use the placeholders OLD and NEW for convenience, instead of the more verbose {old_version} and {new_version}.

$ bumpver update -f -t final -c '[final-version] OLD -> NEW'
...
INFO    - Old Version: 1.2.0b2
INFO    - New Version: 1.2.0
INFO    - git commit --message '[final-version] 1.2.0b2 -> 1.2.0'
...

Similarly to --commit-message you can provide a tag message template by using the --tag-message=<TMPL> parameter or the tag_message configuration:

$ bumpver update -f -t final --tag-message 'release NEW'
INFO    - Old Version: 1.2.0b2
INFO    - New Version: 1.2.0
...
INFO    - git tag --annotate 1.2.0 --message 'release 1.2.0'
...

You can use the same placeholders as in the --commit-message template.

If an empty tag message is provided, bumpver uses a lightweight tag in Git. Otherwise, it utilizes an annotated Git tag. You can read more about Git tagging here.

$ bumpver update -f -t final --tag-message ''
INFO    - Old Version: 1.2.0b2
INFO    - New Version: 1.2.0
...
INFO    - git tag 1.2.0
...

Bumpver allows you to run custom scripts before and after the commit step using the --pre-commit-hook=<PATH> and --post-commit-hook=<PATH> parameter, respectively their configuration counterparts pre_commit_hook and post_commit_hook. Both options require commit=True to be set and the <PATH> must be either absolute or relative to the working dir.

If a script fails (exits with a return_code!=0) bumpver aborts and all subsequent steps won't be executed, e.g. commit, tag and push.

For your convenience there are two environment variables available which can be used in the scripts: BUMPVER_OLD_VERSION and BUMPVER_NEW_VERSION.

Example:

#!/usr/bin/env python
# File path: scripts/print_new_version.py
from os import environ
print("The new version is " + environ.get('BUMPVER_NEW_VERSION', ''))

$ bumpver update --post-commit-hook scripts/print_new_version.py
INFO    - fetching tags from remote (to turn off use: -n / --no-fetch)
INFO    - Old Version: 2023.1001-alpha
INFO    - New Version: 2023.1002-alpha
INFO    - git commit --message 'bump version 2023.1001-alpha -> 2023.1002-alpha'
INFO    - Run post-commit hook: scripts/print_new_version.py
INFO    - 	The new version is 2023.1002-alpha
INFO    - git tag --annotate 2023.1002-alpha --message '2023.1002-alpha'
INFO    - git push origin --follow-tags 2023.1002-alpha HEAD

Make sure your script is executable, otherwise you might be greeted with:

$ bumpver update --post-commit-hook scripts/print_new_version.py
...
INFO    - Run post-commit hook: scripts/print_new_version.py
ERROR   - 	[Errno 13] Permission denied: 'scripts/print_new_version.py'
ERROR   - Script exited with an error. Stopping