Plot labels do not allow spaces

[seismomomo]

(Sorry for multiple edits) The label string does not allow for two words to be separated by a space.

Full code that generated the error

fig.plot(x=df_mis.lon, y=df_mis.lat, 
         pen=f'0.5p,{c_pen}', style='s0.15', color=c_mis, transparency=50, 
         label='Mining events')

Full error message

plot [ERROR]: Cannot find file events
---------------------------------------------------------------------------
GMTCLibError                              Traceback (most recent call last)
Input In [279], in <module>
     22 fig.plot(x=df_eq.lon, y=df_eq.lat, 
     23          pen=f'0.5p,{c_pen}', style='c0.1', color=c_eq, transparency=50, 
     24          label='Earthquake')
     25 fig.plot(x=df_ex.lon, y=df_ex.lat, 
     26          pen=f'1p,{c_ex}', style='x0.15', transparency=40, 
     27          label='Explosion')
---> 28 fig.plot(x=df_mis.lon, y=df_mis.lat, 
     29          pen=f'0.5p,{c_pen}', style='s0.15', color=c_mis, transparency=50, 
     30          label='Mining events')
     31 fig.legend()
     33 # right plot

File [path to env]/lib/python3.10/site-packages/pygmt/helpers/decorators.py:805, in deprecate_parameter.<locals>.deprecator.<locals>.new_module(*args, **kwargs)
    803     warnings.warn(msg, category=FutureWarning, stacklevel=2)
    804     kwargs[newname] = kwargs.pop(oldname)
--> 805 return module_func(*args, **kwargs)

File [path to env]/lib/python3.10/site-packages/pygmt/helpers/decorators.py:805, in deprecate_parameter.<locals>.deprecator.<locals>.new_module(*args, **kwargs)
    803     warnings.warn(msg, category=FutureWarning, stacklevel=2)
    804     kwargs[newname] = kwargs.pop(oldname)
--> 805 return module_func(*args, **kwargs)

File [path to env]/lib/python3.10/site-packages/pygmt/helpers/decorators.py:873, in check_data_input_order.<locals>.data_input_order_checker.<locals>.new_module(*args, **kwargs)
    865     msg = (
    866         "The function parameters has been re-ordered as 'data, x, y, [z]' "
    867         f"since {deprecate_version} but you're passing positional arguments. "
   (...)
    870         f"in {remove_version}."
    871     )
    872     warnings.warn(msg, category=FutureWarning, stacklevel=2)
--> 873 return module_func(*args, **kwargs)

File [path to env]/lib/python3.10/site-packages/pygmt/helpers/decorators.py:586, in use_alias.<locals>.alias_decorator.<locals>.new_module(*args, **kwargs)
    581         msg = (
    582             f"Short-form parameter ({short_param}) is not recommended. "
    583             f"Use long-form parameter '{long_alias}' instead."
    584         )
    585         warnings.warn(msg, category=SyntaxWarning, stacklevel=2)
--> 586 return module_func(*args, **kwargs)

File [path to env]/lib/python3.10/site-packages/pygmt/helpers/decorators.py:726, in kwargs_to_strings.<locals>.converter.<locals>.new_module(*args, **kwargs)
    724             kwargs[arg] = separators[fmt].join(f"{item}" for item in value)
    725 # Execute the original function and return its output
--> 726 return module_func(*args, **kwargs)

File [path to env]/lib/python3.10/site-packages/pygmt/src/plot.py:275, in plot(self, data, x, y, size, direction, **kwargs)
    273 with file_context as fname:
    274     arg_str = " ".join([fname, build_arg_string(kwargs)])
--> 275     lib.call_module("plot", arg_str)

File [path to env]/lib/python3.10/site-packages/pygmt/clib/session.py:500, in Session.call_module(self, module, args)
    496 status = c_call_module(
    497     self.session_pointer, module.encode(), mode, args.encode()
    498 )
    499 if status != 0:
--> 500     raise GMTCLibError(
    501         f"Module '{module}' failed with status code {status}:\n{self._error_message}"
    502     )

GMTCLibError: Module 'plot' failed with status code 72:
plot [ERROR]: Cannot find file events

System information

PyGMT information:
  version: v0.5.0
System information:
  python: 3.10.2 | packaged by conda-forge | (main, Jan 14 2022, 08:02:19) [GCC 9.4.0]
  executable: [path to env]/bin/python
  machine: Linux-3.10.0-1160.36.2.el7.x86_64-x86_64-with-glibc2.17
Dependency information:
  numpy: 1.21.5
  pandas: 1.3.5
  xarray: 0.19.0
  netCDF4: 1.5.8
  packaging: 21.3
  ghostscript: 9.54.0
  gmt: 6.3.0
GMT library information:
  binary dir:[path to env]/bin
  cores: 64
  grid layout: rows
  library path: [path to env]/lib/libgmt.so
  padding: 2
  plugin dir: [path to env]/lib/gmt/plugins
  share dir: [path to env]/share/gmt
  version: 6.3.0

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[weiji14]

Hi @seismomomo, this space issue has been fixed in #1487 and is available in the latest version of PyGMT (v0.6.0), so you can upgrade to get the fix.

Alternatively if you want to stay on PyGMT v0.5.0, use label='"Some label"' (double quotes inside single quotes). See #247 or #1632 for a longer explanation.