Packing in Python: Grouping Multiple Values into a Single Variable
To pack multiple variables, you need to use the * iterable unpacking operator. Simply place an asterisk * before the variable, and it will pack any number of variables. Packing a variable is only possible within a tuple or a list.
a, b, *c = 1, 2, 3, 4, 5 # a = 1, b= 2, c = [3, 4, 5]
a, *b, c = 1, 2, 3, 4, 5 # a = 1, b = [2, 3, 4], c = 5
a, b, *c = 1, 2 # a = 1, b = 2, c = []
*a, b = 1, 2, 3 # a = [1, 2], b = 3
*a, = 1, 2, 3 # a = [1, 2, 3]
(*a,) = 1, 2, 3 # a = [1, 2, 3]
[*a] = 1, 2, 3 # a = [1, 2, 3]
*a = 1, 2, 3 # SyntaxError: starred assignment target must be in a list or tuple
But the SyntaxError will occur if to use more than one unpacking operator.
1*a, *b = 1, 2, 3, 4
1*a, *b, *c = 1, 2, 3
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Can you explain why using more than one unpacking operator causes a SyntaxError?
Are there any workarounds to unpack into multiple lists?
Can you show valid examples of unpacking with the * operator?
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To pack multiple variables, you need to use the * iterable unpacking operator. Simply place an asterisk * before the variable, and it will pack any number of variables. Packing a variable is only possible within a tuple or a list.
a, b, *c = 1, 2, 3, 4, 5 # a = 1, b= 2, c = [3, 4, 5]
a, *b, c = 1, 2, 3, 4, 5 # a = 1, b = [2, 3, 4], c = 5
a, b, *c = 1, 2 # a = 1, b = 2, c = []
*a, b = 1, 2, 3 # a = [1, 2], b = 3
*a, = 1, 2, 3 # a = [1, 2, 3]
(*a,) = 1, 2, 3 # a = [1, 2, 3]
[*a] = 1, 2, 3 # a = [1, 2, 3]
*a = 1, 2, 3 # SyntaxError: starred assignment target must be in a list or tuple
But the SyntaxError will occur if to use more than one unpacking operator.
1*a, *b = 1, 2, 3, 4
1*a, *b, *c = 1, 2, 3
Tak for dine kommentarer!
