Let the class variable assignments are done by the class method, not …

…the write_seq function.

pypulseq/Sequence/sequence.py

@@ -1839,5 +1839,19 @@ def write(self, name: str, create_signature: bool = True, remove_duplicates: boo
  Boolean flag to indicate if the file has to be signed.
  remove_duplicates : bool, default=True
  Remove duplicate events from the sequence before writing
+ 
+ Returns
+ -------
+ signature or None : If create_signature is True, it returns the written .seq file's signature as a string, 
+ otherwise it returns None. Note that, if remove_duplicates is True, signature belongs to the 
+ deduplicated sequences signature, and not the Sequence that is stored in the Sequence object.
  """
- return write_seq(self, name, create_signature, remove_duplicates)
+ signature = write_seq(self, name, create_signature, remove_duplicates)
+
+ if signature is not None:
+ self.signature_type = "md5"
+ self.signature_file = "text"
+ self.signature_value = signature
+ return signature
+ else:
+ return None

pypulseq/Sequence/write_seq.py

@@ -21,6 +21,12 @@ def write(self, file_name: Union[str, Path], create_signature, remove_duplicates
  remove_duplicates : bool
  Before writing, remove and remap events that would be duplicates after
  the rounding done during writing
+ 
+ Returns
+ -------
+ md5 or None : If create_signature is True, it returns the written .seq file's signature as a string, 
+ otherwise it returns None. Note that, if remove_duplicates is True, signature belongs to the 
+ deduplicated sequences signature, and not the Sequence that is stored in the Sequence object.
 
  Raises
  ------
@@ -258,9 +264,6 @@ def write(self, file_name: Union[str, Path], create_signature, remove_duplicates
  buffer = output_file.read()
 
  md5 = hashlib.md5(buffer.encode("utf-8")).hexdigest()
- self.signature_type = "md5"
- self.signature_file = "text"
- self.signature_value = md5
 
  # Write signature
  with open(file_name, "a") as output_file: