"Parametric sweep" in demo/demo.ipynb fails (v0.4.1)

[jpmorgan98]

Describe the bug
Using MontePy 0.4.1 when running the example script (demo/demo.ipynb) fails in the final cell when attempting to open a file that does not exist: parametric/pin_cell_0.35r_1.0p.imcnp. The sub-directory parametric does not exist, if that sub-directory is manually generated by the user then things proceed without a hitch.

My guess is this is a Mac only bug

To Reproduce

Run the final cell in in /demo/demo.ipynb

Error Message (if any)

---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
Cell In[10], line 17
     15 for plane in box_walls:
     16     plane.location = (pitch / 2) * (-1 if plane.location < 0 else 1)
---> 17 problem.write_to_file(f\"parametric/pin_cell_{pin_radius}r_{pitch}p.imcnp\")

File /opt/homebrew/Caskroom/mambaforge/base/envs/mcdc-env/lib/python3.11/site-packages/montepy/mcnp_problem.py:529, in MCNP_Problem.write_to_file(self, file_path, overwrite)
    514 def write_to_file(self, file_path, overwrite=False):
    515     \"\"\"
    516     Writes the problem to a file.
    517 
   (...)
    527     :raises IsADirectoryError: if the path given is actually a directory.
    528     \"\"\"
--> 529     return self.write_problem(file_path, overwrite)

File /opt/homebrew/Caskroom/mambaforge/base/envs/mcdc-env/lib/python3.11/site-packages/montepy/mcnp_problem.py:507, in MCNP_Problem.write_problem(self, destination, overwrite)
    505 elif isinstance(destination, (str, os.PathLike)):
    506     new_file = MCNP_InputFile(destination, overwrite=overwrite)
--> 507     with new_file.open(\"w\") as fh:
    508         self._write_to_stream(fh)
    509 else:

File /opt/homebrew/Caskroom/mambaforge/base/envs/mcdc-env/lib/python3.11/site-packages/montepy/input_parser/input_file.py:133, in MCNP_InputFile.open(self, mode, encoding, replace)
    129     if os.path.isdir(self.path):
    130         raise IsADirectoryError(
    131             f\"{self.path} is a directory, and cannot be overwritten.\"
    132         )
--> 133 self._fh = open(self.path, mode, encoding=encoding)
    134 return self

FileNotFoundError: [Errno 2] No such file or directory: 'parametric/pin_cell_0.35r_1.0p.imcnp'"

Version

• Version 0.4.1
• Python 3.12.6

Additional context

This is part of the PyOpenSci review!

[MicahGale]

Thanks for the bug report. The demos need some attention.