*Memo:
combinations() can return the iterator which uniquely combines the elements of iterable one by one to return a tuple of zero or more elements one by one as shown below:
*Memo:
- The 1st argument is
iterable(Required-Type:Iterable). - The 2nd argument is
r(Required-Type:int):- It's the length of the returned tuple.
- It must be
0 <= x.
from itertools import combinations
v = combinations(iterable='', r=0)
v = combinations(iterable=[], r=0)
print(v)
# <itertools.combinations object at 0x0000026906D95CB0>
print(next(v)) # ()
print(next(v)) # StopIteration:
from itertools import combinations
v = combinations(iterable='ABCD', r=1)
v = combinations(iterable=['A', 'B', 'C', 'D'], r=1)
print(next(v)) # ('A',)
print(next(v)) # ('B',)
print(next(v)) # ('C',)
print(next(v)) # ('D',)
print(next(v)) # StopIteration:
from itertools import combinations
for x in combinations(iterable='ABCD', r=2):
# for x in combinations(iterable=['A', 'B', 'C', 'D'], r=2):
print(x)
# ('A', 'B')
# ('A', 'C')
# ('A', 'D')
# ('B', 'C')
# ('B', 'D')
# ('C', 'D')
from itertools import combinations
for x in combinations(iterable='ABCD', r=3):
# for x in combinations(iterable=['A', 'B', 'C', 'D'], r=3):
print(x)
# ('A', 'B', 'C')
# ('A', 'B', 'D')
# ('A', 'C', 'D')
# ('B', 'C', 'D')
from itertools import combinations
for x in combinations(iterable='ABCD', r=4):
# for x in combinations(iterable=['A', 'B', 'C', 'D'], r=4):
print(x)
# ('A', 'B', 'C', 'D')
from itertools import combinations
for x in combinations(iterable='ABCD', r=5):
# for x in combinations(iterable=['A', 'B', 'C', 'D'], r=5):
print(x)
# Nothing
combinations_with_replacement() can return the iterator which non-uniquely combines the elements of iterable one by one to return a tuple of zero or more elements one by one as shown below:
*Memo:
- The 1st argument is
iterable(Required-Type:Iterable). - The 2nd argument is
r(Required-Type:int):- It's the length of the returned tuple.
- It must be
0 <= x.
from itertools import combinations_with_replacement
v = combinations_with_replacement(iterable='', r=0)
v = combinations_with_replacement(iterable=[], r=0)
print(v)
# <itertools.combinations_with_replacement object at 0x0000026906DAAED0>
print(next(v)) # ()
print(next(v)) # StopIteration:
from itertools import combinations_with_replacement
v = combinations_with_replacement(iterable='ABCD', r=1)
v = combinations_with_replacement(iterable=['A', 'B', 'C', 'D'], r=1)
print(next(v)) # ('A',)
print(next(v)) # ('B',)
print(next(v)) # ('C',)
print(next(v)) # ('D',)
print(next(v)) # StopIteration:
from itertools import combinations_with_replacement
for x in combinations_with_replacement(iterable='ABCD', r=2):
# for x in combinations_with_replacement(iterable=['A', 'B', 'C', 'D'], r=2):
print(x)
# ('A', 'A')
# ('A', 'B')
# ('A', 'C')
# ('A', 'D')
# ('B', 'B')
# ('B', 'C')
# ('B', 'D')
# ('C', 'C')
# ('C', 'D')
# ('D', 'D')
from itertools import combinations_with_replacement
for x in combinations_with_replacement(iterable='ABCD', r=3):
# for x in combinations_with_replacement(iterable=['A', 'B', 'C', 'D'], r=3):
print(x)
# ('A', 'A', 'A')
# ('A', 'A', 'B')
# ('A', 'A', 'C')
# ('A', 'A', 'D')
# ('A', 'B', 'B')
# ('A', 'B', 'C')
# ('A', 'B', 'D')
# ('A', 'C', 'C')
# ('A', 'C', 'D')
# ('A', 'D', 'D')
# ('B', 'B', 'B')
# ('B', 'B', 'C')
# ('B', 'B', 'D')
# ('B', 'C', 'C')
# ('B', 'C', 'D')
# ('B', 'D', 'D')
# ('C', 'C', 'C')
# ('C', 'C', 'D')
# ('C', 'D', 'D')
# ('D', 'D', 'D')
from itertools import combinations_with_replacement
for x in combinations_with_replacement(iterable='ABCD', r=4):
# for x in combinations_with_replacement(iterable=['A', 'B', 'C', 'D'], r=4):
print(x)
# ('A', 'A', 'A', 'A')
# ('A', 'A', 'A', 'B')
# ('A', 'A', 'A', 'C')
# ('A', 'A', 'A', 'D')
# ('A', 'A', 'B', 'B')
# ('A', 'A', 'B', 'C')
# ('A', 'A', 'B', 'D')
# ('A', 'A', 'C', 'C')
# ('A', 'A', 'C', 'D')
# ('A', 'A', 'D', 'D')
# ('A', 'B', 'B', 'B')
# ('A', 'B', 'B', 'C')
# ('A', 'B', 'B', 'D')
# ('A', 'B', 'C', 'C')
# ('A', 'B', 'C', 'D')
# ('A', 'B', 'D', 'D')
# ('A', 'C', 'C', 'C')
# ('A', 'C', 'C', 'D')
# ('A', 'C', 'D', 'D')
# ('A', 'D', 'D', 'D')
# ('B', 'B', 'B', 'B')
# ('B', 'B', 'B', 'C')
# ('B', 'B', 'B', 'D')
# ('B', 'B', 'C', 'C')
# ('B', 'B', 'C', 'D')
# ('B', 'B', 'D', 'D')
# ('B', 'C', 'C', 'C')
# ('B', 'C', 'C', 'D')
# ('B', 'C', 'D', 'D')
# ('B', 'D', 'D', 'D')
# ('C', 'C', 'C', 'C')
# ('C', 'C', 'C', 'D')
# ('C', 'C', 'D', 'D')
# ('C', 'D', 'D', 'D')
# ('D', 'D', 'D', 'D')
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