mirror of
https://github.com/m-lamonaca/dev-notes.git
synced 2025-04-05 18:36:41 +00:00
72 lines
2.5 KiB
Markdown
72 lines
2.5 KiB
Markdown
# Itertools Module
|
||
|
||
``` py
|
||
# accumulate ([1,2,3,4,5]) -> 1, 3 (1 + 2), 6 (1 + 2 + 3), 10 (1 + 2 + 3 + 6), 15 (1+ 2 + 3 + 4 + 5)
|
||
# accumulate (iter, func (,)) -> iter [0], func (iter [0] + iter [1]) + func (prev + iter [2]), ...
|
||
accumulate (iterable, func (_, _))
|
||
|
||
# iterator returns elements from the first iterable,
|
||
# then proceeds to the next until the end of the iterables
|
||
# does not work if there is only one iterable
|
||
chain (* iterable)
|
||
|
||
# concatenates elements of the single iterable even if it contains sequences
|
||
chain.from_iterable (iterable)
|
||
|
||
# returns sequences of length r starting from the iterable
|
||
# items treated as unique based on their value
|
||
combinations (iterable, r)
|
||
|
||
# # returns sequences of length r starting from the iterable allowing the repetition of the elements
|
||
combinations_with_replacement (iterable, r)
|
||
|
||
# iterator filters date elements returning only those that have
|
||
# a corresponding element in selectors that is true
|
||
compress (data, selectors)
|
||
|
||
count (start, step)
|
||
|
||
# iterator returning values in infinite sequence
|
||
cycle (iterable)
|
||
|
||
# iterator discards elements of the iterable as long as the predicate is true
|
||
dropwhile (predicate, iterable)
|
||
|
||
# iterator returning values if predicate is false
|
||
filterfalse (predicate, iterable)
|
||
|
||
# iterator returns tuple (key, group)
|
||
# key is the grouping criterion
|
||
# group is a generator returning group members
|
||
groupby (iterable, key = None)
|
||
|
||
# iterator returns slices of the iterable
|
||
isslice (iterable, stop)
|
||
isslice (iterable, start, stop, step)
|
||
|
||
# returns all permutations of length r of the iterable
|
||
permutations (iterable, r = None)
|
||
|
||
# Cartesian product of iterables
|
||
# loops iterables in order of input
|
||
# [product ('ABCD', 'xy') -> Ax Ay Bx By Cx Cy Dx Dy]
|
||
# [product ('ABCD', repeat = 2) -> AA AB AC AD BA BB BC BD CA CB CC CD DA DB DC DD]
|
||
product (* iterable, repetitions = 1)
|
||
|
||
# returns an object infinite times if repetition is not specified
|
||
repeat (object, repetitions)
|
||
|
||
# iterator compute func (iterable)
|
||
# used if iterable is pre-zipped sequence (seq of tuples grouping elements)
|
||
starmap (func, iterable)
|
||
|
||
# iterator returning values from iterable as long as predicate is true
|
||
takewhile (predicate, iterable)
|
||
|
||
# returns n independent iterators from the single iterable
|
||
tee (iterable, n = 2)
|
||
|
||
# produces an iterator that aggregates elements from each iterable
|
||
# if the iterables have different lengths the missing values are filled according to fillervalue
|
||
zip_longest (* iterable, fillvalue = None)
|
||
```
|