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[compat] Replace deficient ChainMap class in Py3.3 and earlier

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This commit is contained in:
dirkf 2022-08-26 10:17:56 +01:00
parent 4c6fba3765
commit 0f6422590e
1 changed files with 5 additions and 1 deletions
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6
youtube_dl/compat.py
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@ -3004,8 +3004,11 @@ except ImportError:
# new class in collections
try:
from collections import ChainMap as compat_collections_chain_map
# Py3.3's ChainMap is deficient
if sys.version_info <= (3, 3):
raise ImportError
except ImportError:
# Py < 3.3
# Py <= 3.3
class compat_collections_chain_map(compat_collections_abc.MutableMapping):
maps = [{}]
@ -3060,6 +3063,7 @@ except ImportError:
def parents(self):
return compat_collections_chain_map(*(self.maps[1:]))
# Pythons disagree on the type of a pattern (RegexObject, _sre.SRE_Pattern, Pattern, ...?)
compat_re_Pattern = type(re.compile(''))