*Memo:
starmap() can return the iterator which does function with the elements of iterable one by one to returns the result one by one as shown below:
*Memo:
- The 1st argument is
function(Required-Type:Callable):
- Don't use
function=.
- Don't use
- The 2nd argument is
iterable(Required-Type:Iterable):
- Don't use
iterable=.
- Don't use
from itertools import starmap
x = starmap(lambda: None, [])
print(x)
# <itertools.starmap object at 0x000001BE9A289CF0>
print(next(x))
# StopIteration:
from itertools import starmap
from operator import add
x = starmap(lambda a, b: a+b, [(2, 5), (3, 2), (10, 3)])
x = starmap(add, [(2, 5), (3, 2), (10, 3)])
print(next(x)) # 7
print(next(x)) # 5
print(next(x)) # 13
print(next(x)) # StopIteration:
from itertools import starmap
from operator import mul
for x in starmap(lambda a, b: a*b, [(2, 5), (3, 2), (10, 3)]):
# for x in starmap(mul, [(2, 5), (3, 2), (10, 3)]):
print(x)
# 10
# 6
# 30
from itertools import starmap
for x in starmap(lambda a, b: a**b, [(2, 5), (3, 2), (10, 3)]):
# for x in starmap(pow, [(2, 5), (3, 2), (10, 3)]):
print(x)
# 32
# 9
# 1000
tee() can return a tuple of the iterators which each return the elements of iterable one by one as shown below:
*Memo:
- The 1st argument is
iterable(Required-Type:Iterable):
- Don't use
iterable=.
- Don't use
- The 2nd argument is
n(Optional-Default:2-Type:int):
- It's the number of iterators.
- It must be
0 <= x. - Don't use
n=.
from itertools import tee
v = tee('ABC')
v = tee('ABC', 2)
v = tee(['A', 'B', 'C'])
print(v)
# (<itertools._tee object at 0x000001BE99D6E3C0>,
# <itertools._tee object at 0x000001BE99F85440>)
print(next(v[0])) # A
print(next(v[0])) # B
print(next(v[0])) # C
print(next(v[1])) # A
print(next(v[1])) # B
print(next(v[1])) # C
print(next(v[0])) # StopIteration:
print(next(v[1])) # StopIteration:
from itertools import tee
for x in tee('ABC'):
# for x in tee(['A', 'B', 'C']):
for y in x:
print(y)
# A
# B
# C
# A
# B
# C
from itertools import tee
for x in tee('ABC', 3):
# for x in tee(['A', 'B', 'C'], 3):
for y in x:
print(y)
# A
# B
# C
# A
# B
# C
# A
# B
# C
zip_longest() can return the iterator which aggregates the elements of *iterables one by one to returns a tuple of one or more elements one by one as shown below:
*Memo:
- The 1st arguments are
*iterables(Optional-Default:()-Type:Iterable):
- Don't use any keywords like
*iterables=,iterables=, etc.
- Don't use any keywords like
- The 2nd argument is
fillvalue(Optional-Default:None-Type:Any or NoneType):
- It's the value to fill the zero or more missing elements of a returned tuple.
fillvalue=must be used.
from itertools import zip_longest
v = zip_longest()
v = zip_longest((), fillvalue=None)
print(v)
# <itertools.zip_longest object at 0x000001BE99F29FD0>
print(next(v))
# StopIteration:
from itertools import zip_longest
v = zip_longest('ABC')
v = zip_longest(['A', 'B', 'C'])
print(next(v)) # ('A',)
print(next(v)) # ('B',)
print(next(v)) # ('C',)
print(next(v)) # StopIteration:
from itertools import zip_longest
v = zip_longest('ABC', 'vwxyz')
v = zip_longest(['A', 'B', 'C'], ['v', 'w', 'x', 'y', 'z'])
print(next(v)) # ('A', 'v')
print(next(v)) # ('B', 'w')
print(next(v)) # ('C', 'x')
print(next(v)) # (None, 'y')
print(next(v)) # (None, 'z')
print(next(v)) # StopIteration:
from itertools import zip_longest
v = zip_longest('ABC', 'vwxyz', fillvalue='Abscent')
v = zip_longest(['A', 'B', 'C'], ['v', 'w', 'x', 'y', 'z'],
fillvalue='Abscent')
print(next(v)) # ('A', 'v')
print(next(v)) # ('B', 'w')
print(next(v)) # ('C', 'x')
print(next(v)) # ('Abscent', 'y')
print(next(v)) # ('Abscent', 'z')
print(next(v)) # StopIteration:
from itertools import zip_longest
for x in zip_longest('ABC', 'vwxyz', [10, 20], fillvalue='Abscent'):
# for x in zip_longest(['A', 'B', 'C'], ['v', 'w', 'x', 'y', 'z'],
# [10, 20], fillvalue='Abscent'):
print(x)
# ('A', 'v', 10)
# ('B', 'w', 20)
# ('C', 'x', 'Abscent')
# ('Abscent', 'y', 'Abscent')
# ('Abscent', 'z', 'Abscent')
from itertools import zip_longest
for x in zip_longest('ABC', 'vwxyz', [10, 20], fillvalue='Abscent'):
# for x in zip_longest(['A', 'B', 'C'], ['v', 'w', 'x', 'y', 'z'],
# [10, 20], fillvalue='Abscent'):
for y in x:
print(y)
# A
# v
# 10
# B
# w
# 20
# C
# x
# Abscent
# Abscent
# y
# Abscent
# Abscent
# z
# Abscent
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