python调用带参函数

There are following types of function calls in python:

python中有以下类型的函数调用：

1. Call by value

   按价值致电

2. Call by reference

   通过参考电话

1)按价值致电 (1) Call by value )

When, we call a function with the values i.e. pass the variables (not their references), the values of the passing arguments cannot be changes inside the function.

当我们调用带有值的函数时，即传递变量(而不是它们的引用)时，传递的参数的值不能在函数内部更改。

# call by value 
def change(data):
data=45
print("Inside Function :",data)
def main():
data=20
print("Before Calling  :",data)
change(data)
print("After  Calling  :", data)
if __name__=="__main__":main()

Output

输出量

Before Calling  : 20
Inside Function : 45
After  Calling  : 20

2)致电查询 (2) Call by reference)

When, we call a function with the reference/object, the values of the passing arguments can be changes inside the function.

当我们调用带有引用/对象的函数时，可以在函数内部更改传递参数的值。

Example 1: Calling function by passing the object to the class

示例1：通过将对象传递给类来调用函数

class mydata:
def __init__(self):
self.__data=0
def setdata(self,value):
self.__data=value
def getdata(self):
return self.__data
def change(data):
data.setdata(45)
print("Inside Function :",data.getdata())
def main():
data=mydata()
data.setdata(20)
print("Before Calling  :",data.getdata())
change(data)
print("After  Calling  :", data.getdata())
if __name__=="__main__":main()

Output

输出量

Before Calling  : 20
Inside Function : 45
After  Calling  : 45

Example 2: Calling function by passing the reference to the list

示例2：通过将引用传递给列表来调用函数

def change(data):
data[1]=25
print("Inside Function :",data)
def main():
data=[10,20,30,40,50]
print("Before Calling  :",data)
change(data)
print("After  Calling  :", data)
if __name__=="__main__":main()

Output

输出量

Before Calling  : [10, 20, 30, 40, 50]
Inside Function : [10, 25, 30, 40, 50]
After  Calling  : [10, 25, 30, 40, 50]

翻译自: https://www.includehelp.com/python/types-of-function-calling-with-examples.aspx

python调用带参函数