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Document.__init__() got an unexpected keyword argument 'encoding' #4746
Description
Description of the bug
doc.subset_fonts(verbose=True, fallback=True)raise
Traceback (most recent call last):
doc.subset_fonts(verbose=True, fallback=True) # build subset fonts to reduce file size
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "venv\Lib\site-packages\pymupdf\__init__.py", line 7710, in subset_fonts
new_buffer = build_subset(old_buffer, subsets[0], subsets[1])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "venv\Lib\site-packages\pymupdf\__init__.py", line 7562, in build_subset
with open(f"{tmp_dir}/uncfile.txt", "w", encoding='utf8') as unc_file:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: Document.__init__() got an unexpected keyword argument 'encoding'
How to reproduce the bug
This issue seems to be caused by the open attr is override in pymupdf.init.py
PyMuPDF version
1.26.6
Operating system
Windows
Python version
3.11
Activity
DeltaFlyerW commentedon Oct 15, 2025
Temporory fix:
julian-smith-artifex-com commentedon Oct 15, 2025
Thanks for reporting this. I have a fix in my tree.
We will close this issue when the fix is released.
julian-smith-artifex-com commentedon Nov 5, 2025
Fixed in pymupdf-1.26.6.