Confused Xiaobai for a long time - why do Python lists and dictionaries have asterisks (* *)?

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Today, let's learn why Python Lists and dictionaries are preceded by asterisks （）？**

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Python in , Single star * And the double star ** Except as “ ride ” and “ power ” Outside the numeric operator , Still on the list 、 Tuples 、 Dictionary plays an important role in the operation of .

One 、 list （list）、 Tuples （tuple） Preceded by an asterisk *

The asterisk in front of the list is used to untie the list （unpacke） Into multiple independent parameters , Passing in functions .

def add(a, b):
return a + b
data = [7, 8]
print(add(*data)) # 15
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import numpy as np
print(np.arange(3,6)) # [3 4 5]
list2 = [3, 6]
print(np.arange(*list2)) # [3 4 5]

Two 、 Dictionaries （dict） Preceded by two asterisks **

Add two asterisks in front of the dictionary , Is to unpack the dictionary into independent elements as formal parameters .

def add(a, b):
return a + b
data = {
'a':7, 'b':8}
print(add(**data)) # 15

Today's knowledge point is like this , I hope I'm studying by myself python You have helped ~

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