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My post explains
[]and()for variables inforstatement. - My post explains variable assignment.
- My post explains iterable unpacking in variable assignment.
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My post explains
*for iterable unpacking in variable assignment.
You can use one or more [] and () for one or more variables in a variable assignment as shown below:
mylist = [[[5]]]
v1 = mylist
(v1) = mylist
print(v1) # [[[5]]]
[v1] = mylist
(v1,) = mylist
print(v1) # [[5]]
[[v1]] = mylist
((v1,),) = mylist
print(v1) # [5]
[[[v1]]] = mylist
(((v1,),),) = mylist
print(v1) # 5
mytuple = (((5,),),)
v1 = mytuple
(v1) = mytuple
print(v1) # (((5,),),)
[v1] = mytuple
(v1,) = mytuple
print(v1) # ((5,),)
[[v1]] = mytuple
((v1,),) = mytuple
print(v1) # (5,)
[[[v1]]] = mytuple
(((v1,),),) = mytuple
print(v1) # 5
mylist = [0, 1, [2, 3, [4, 5]]]
v1 = mylist
print(v1) # [0, 1, [2, 3, [4, 5]]]
[v1, v2, v3] = mylist
(v1, v2, v3) = mylist
print(v1, v2, v3) # 0 1 [2, 3, [4, 5]]
[v1, v2, [v3, v4, v5]] = mylist
(v1, v2, (v3, v4, v5)) = mylist
print(v1, v2, v3, v4, v5) # 0 1 2 3 [4, 5]
[v1, v2, [v3, v4, [v5, v6]]] = mylist
(v1, v2, (v3, v4, (v5, v6))) = mylist
print(v1, v2, v3, v4, v5, v6) # 0 1 2 3 4 5
mytuple = (0, 1, (2, 3, (4, 5)))
v1 = mytuple
print(v1) # (0, 1, (2, 3, (4, 5)))
[v1, v2, v3] = mytuple
(v1, v2, v3) = mytuple
print(v1, v2, v3) # 0 1 (2, 3, (4, 5))
[v1, v2, [v3, v4, v5]] = mytuple
(v1, v2, (v3, v4, v5)) = mytuple
print(v1, v2, v3, v4, v5) # 0 1 2 3 (4, 5)
[v1, v2, [v3, v4, [v5, v6]]] = mytuple
(v1, v2, (v3, v4, (v5, v6))) = mytuple
print(v1, v2, v3, v4, v5, v6) # 0 1 2 3 4 5
Only one *variable can be used in each [] and () as shown below:
mylist = [0, 1, [2, 3, [4, 5]]]
v1 = mylist
*v1, = mylist
*(v1), = mylist
print(v1) # [0, 1, [2, 3, [4, 5]]]
[v1, *v2, v3] = mylist
(v1, *v2, v3) = mylist
print(v1, v2, v3) # 0 [1] [2, 3, [4, 5]]
[v1, *v2, [*v3, v4, v5]] = mylist
(v1, *v2, (*v3, v4, v5)) = mylist
print(v1, v2, v3, v4, v5) # 0 [1] [2] 3 [4, 5]
[v1, *v2, [*v3, v4, [v5, *v6]]] = mylist
(v1, *v2, (*v3, v4, (v5, *v6))) = mylist
print(v1, v2, v3, v4, v5, v6) # 0 [1] [2] 3 4 [5]
mytuple = (0, 1, (2, 3, (4, 5)))
v1 = mytuple
print(v1)
# (0, 1, (2, 3, (4, 5)))
*v1, = mytuple
*(v1), = mytuple
print(v1) # (0, 1, (2, 3, (4, 5)))
[v1, *v2, v3] = mytuple
(v1, *v2, v3) = mytuple
print(v1, v2, v3) # 0 [1] (2, 3, (4, 5))
[v1, *v2, [*v3, v4, v5]] = mytuple
(v1, *v2, (*v3, v4, v5)) = mytuple
print(v1, v2, v3, v4, v5) # 0 [1] [2] 3 (4, 5)
[v1, *v2, [*v3, v4, [v5, *v6]]] = mytuple
(v1, *v2, (*v3, v4, (v5, *v6))) = mytuple
print(v1, v2, v3, v4, v5, v6) # 0 [1] [2] 3 4 [5]
One or more [] and () cannot be used for one or more function parameters as shown below:
def func([p]): pass
# SyntaxError: invalid syntax
def func((p)): pass
def func((p,)): pass
# SyntaxError: Function parameters cannot be parenthesized
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