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Add defaultdict to collections; add pprint.py #1134

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Merged
merged 2 commits into from
Jul 11, 2019
Merged

Add defaultdict to collections; add pprint.py #1134

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5e5d726
Add defaultdict to collections
coolreader18 Jul 11, 2019
bf3f09c
Add pprint.py
coolreader18 Jul 11, 2019
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6 changes: 6 additions & 0 deletions Lib/collections/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1277,3 +1277,9 @@ def translate(self, *args):
return self.__class__(self.data.translate(*args))
def upper(self): return self.__class__(self.data.upper())
def zfill(self, width): return self.__class__(self.data.zfill(width))

# FIXME: try to implement defaultdict in collections.rs rather than in Python
# I (coolreader18) couldn't figure out some class stuff with __new__ and
# __init__ and __missing__ and subclassing built-in types from Rust, so I went
# with this instead.
from ._defaultdict import *
20 changes: 20 additions & 0 deletions Lib/collections/_defaultdict.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
class defaultdict(dict):
def __new__(cls, *args, **kwargs):
if len(args) >= 1:
default_factory = args[0]
args = args[1:]
else:
default_factory = None
self = dict.__new__(cls, *args, **kwargs)
self.default_factory = default_factory
return self

def __missing__(self, key):
if self.default_factory:
return self.default_factory()
else:
raise KeyError(key)

def __repr__(self):
return f"defaultdict({self.default_factory}, {dict.__repr__(self)})"

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