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Detailed example of Python reference passing by value concept
Detailed example of Python reference passing by value concept
This article mainly introduces the concept and usage of Python reference by value, briefly analyzes the concept and function of Python reference by value, and summarizes and analyzes the specific implementation and usage of Python reference by value in the form of examples. Friends who need it can Refer to the following
The examples in this article describe the concept and usage of Python reference passing by value. Share it with everyone for your reference, the details are as follows:
The parameter value of the Python function is passed by reference, which means that is passed the memory address value of the parameter, so in the function Changing the value of a parameter within the function will also change outside the function.
What needs to be noted here is thatIf the passed parameter type is immutable, such as String type or tuple type, if the value of the parameter needs to be changed within the function, it is equivalent to creating a new object.
# 添加了一个string类型的元素添加到末尾 def ChangeList(lis): lis.append('hello i am the addone') print lis return lis = [1, 2, 3] ChangeList(lis) print lis
The result is:
[1,2,3, 'hello i am the addone'] [1,2, 3,'hello i am the addone']
def ChangeString(string): string = 'i changed as this' print string return string = 'hello world' ChangeString(string) print string
String is not possible Changing the type, the result is:
i changed as this hello world
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