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Fix 'BytesWarning: Comparison between bytes and string' in PdfDict

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When bytes warnings are enabled with the '-b' argument, the PdfDict
class would emit a warning.
https://docs.python.org/3/using/cmdline.html#miscellaneous-options

> -b
>
> Issue a warning when comparing bytes or bytearray with str or bytes
> with int.

Object attributes are always type str, so can safely encode them without
a type check. Observe:

    $ python3
    >>> o = object()
    >>> setattr(o, b'foo', b'bar')
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    TypeError: attribute name must be string, not 'bytes'
This commit is contained in:
Jon Dufresne 2019-01-13 09:17:51 -08:00
parent b62ff510aa
commit c41ec5b115
1 changed files with 3 additions and 8 deletions
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11
src/PIL/PdfParser.py
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@ -269,18 +269,13 @@ class PdfDict(UserDict):
else: else:
self.__dict__[key] = value self.__dict__[key] = value
else: else:
if isinstance(key, str): self[key.encode("us-ascii")] = value
key = key.encode("us-ascii")
self[key] = value
def __getattr__(self, key): def __getattr__(self, key):
try: try:
value = self[key] value = self[key.encode("us-ascii")]
except KeyError: except KeyError:
try: raise AttributeError(key)
value = self[key.encode("us-ascii")]
except KeyError:
raise AttributeError(key)
if isinstance(value, bytes): if isinstance(value, bytes):
value = decode_text(value) value = decode_text(value)
if key.endswith("Date"): if key.endswith("Date"):