New submission from Борис Верховский <[email protected]>:
pickle.load() and pickle.dump() take a file object as an argument. That file
object must be opened in binary mode ("rb" or "wb"). If it's not, pickle raises
a confusing error message.
When pickle.dump()'ing to a file opened in "w" mode instead of "wb" mode it'll
raise a TypeError:
TypeError: write() argument must be str, not bytes
I thought it might be getting this because I was pickling bytes objects.
For pickle.load()'ing from a file opened in "r" mode instead of "rb" mode,
it'll raise a UnicodeDecodeError
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 0: invalid
start byte
There are a couple pages on the internet (just search "pickle" followed by
either error message) with people being confused about this.
pickle should catch these errors and report something more useful.
----------
components: Library (Lib)
messages: 352813
nosy: boris
priority: normal
severity: normal
status: open
title: pickle.dump and load error message when file isn't opened in binary mode
are not useful
versions: Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue38226>
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