Thread by @Pythonista92

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Day 8 of #100DaysOfCode.

Python
Type 2 of itertools
remember you have to import them using
from itertools import name_of_itertool

1)takewhile
Take values from iterable while the predicate function remains true,once predicate function returns false it will no
longer take values.
example:
lis=[2,4,1,8,6,14]
lis_even=list(takewhile(lambda x:x % 2 == 0,lis))
returns lis_even=[2,4]

2)accumulate
Returns a running total of values in iterable.
lis=[0,1,2,3]
lis_new=list(accumulate(lis))
returns lis_new=[0,1,3,6]

3)chain
combines several iterables into one long one.
example:
lis_1 =[0,1,2]
lis_2 =[3,4]
lis_3 = list(chain(lis_1,lis_2))
returns lis_3=[0,1,2,3,4]

Type 3:Combination Generators

4)Product
Returns Cartesian Product of iterables
exmaple:
lis1=[1,2]
lis2=[3,4]
lis3=list(product(lis1,lis2))
returns lis3 = [(1, 3), (1, 4), (2, 3), (2, 4)]

5)Permutations
can be used to find permutations.
Syntax:
permutations(iterable,r=no_of_elements_in_one_arrangement)
exmaple
lis=[1,2]
lis1=list(permutations(lis,r=2))
returns lis1=[(1,2),(2,1)]

6)Combinations
Syntax:
combinations(iterable,r=no_of_elements_in_one_arrangement)
exmaple
lis=[1,2]
lis1=list(combinations(lis,r=2))
returns lis1=[(1,2)]

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