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Misc improvement to the docs for itertools #119529

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Merged
rhettinger merged 16 commits into from
May 24, 2024
Merged

Misc improvement to the docs for itertools #119529

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ed59bc4
Simplify takewhile()
rhettinger May 23, 2024
acd55be
Tighter sentence
rhettinger May 23, 2024
376b376
Remove redundant batched() example. Improve variable name.
rhettinger May 23, 2024
ac27f16
Grammar nits.
rhettinger May 23, 2024
ded2660
Grammar nits.
rhettinger May 23, 2024
2a53903
Improve comress() text and code equivalent.
rhettinger May 23, 2024
83a4c37
Improve dropwhile() example with unique data elements
rhettinger May 23, 2024
a1a864e
Improve filterfalse() example with clearer predicate
rhettinger May 23, 2024
8fc899c
Clearer generator version of the rough code equivalent
rhettinger May 23, 2024
9724d5e
Better argument ordering in islice() equivalent
rhettinger May 23, 2024
3b8195b
Improve clarity of takewhile() example using unique inputs
rhettinger May 23, 2024
19de882
.
rhettinger May 23, 2024
743d5c2
Use map() to build the list of iterators
rhettinger May 23, 2024
163428a
.
rhettinger May 24, 2024
0b19fb6
.
rhettinger May 24, 2024
f297933
Sync the filterfalse() example with the dropwhile() example
rhettinger May 24, 2024
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Clearer generator version of the rough code equivalent
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@rhettinger
rhettinger committed May 23, 2024
commit 8fc899c8676105dd6ead86fd6dda825a1b9dd2d6
53 changes: 27 additions & 26 deletions Doc/library/itertools.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -437,36 +437,37 @@ loops that truncate the stream.

:func:`groupby` is roughly equivalent to::

class groupby:
def groupby(iterable, key=None):
# [k for k, g in groupby('AAAABBBCCDAABBB')] → A B C D A B
# [list(g) for k, g in groupby('AAAABBBCCD')] → AAAA BBB CC D

def __init__(self, iterable, key=None):
if key is None:
key = lambda x: x
self.keyfunc = key
self.it = iter(iterable)
self.tgtkey = self.currkey = self.currvalue = object()

def __iter__(self):
return self

def __next__(self):
self.id = object()
while self.currkey == self.tgtkey:
self.currvalue = next(self.it) # Exit on StopIteration
self.currkey = self.keyfunc(self.currvalue)
self.tgtkey = self.currkey
return (self.currkey, self._grouper(self.tgtkey, self.id))

def _grouper(self, tgtkey, id):
while self.id is id and self.currkey == tgtkey:
yield self.currvalue
try:
self.currvalue = next(self.it)
except StopIteration:
keyfunc = (lambda x: x) if key is None else key
iterator = iter(iterable)
exhausted = False

def _grouper(target_key):
nonlocal curr_value, curr_key, exhausted
yield curr_value
for curr_value in iterator:
curr_key = keyfunc(curr_value)
if curr_key != target_key:
return
self.currkey = self.keyfunc(self.currvalue)
yield curr_value
exhausted = True

try:
curr_value = next(iterator)
except StopIteration:
return
curr_key = keyfunc(curr_value)

while not exhausted:
target_key = curr_key
curr_group = _grouper(target_key)
yield curr_key, curr_group
if curr_key == target_key:
for _ in curr_group:
pass


.. function:: islice(iterable, stop)
Expand Down