Python's closure function

An inner function is defined in an outer function, and a temporary variable of the outer function is used in the inner function, and the return value of the outer function is a reference to the inner function. This makes up a closure.

#闭包函数的实例
# outer is a temporary variable where external functions A and B are external functions
def outer (a):
b = 10
# inner is an intrinsic function
def inner ():
#在内函数中 used a temporary variable for the outer function.
Print (A+B)
# The return value of the outer function is a reference to the inner function
return inner

if __name__ = = ' __main__ ':
# Here we call the outer function passed in parameter 5
#此时外函数两个临时变量 A is 5 B is 10, and creates an inner function, and then returns a reference to the inner function to the demo
# when the outer function ends, the inner function will use its own temporary variable, and the temporary variables will not be freed and bound to the inner function.
Demo = outer (5)
# We call an intrinsic function to see if an intrinsic function can use a temporary variable of an external function
# The demo saves the return value of the outer function, which is the reference to the inner function, which is equivalent to executing the inner function
Demo () # 15

Demo2 = outer (7)
Demo2 () #17

Python's closure function