Python anonymous function lambda

Lambda is an anonymous function in the form of

lambda x : x * x

Equivalent to

def func(x):    return x * x

where "X" is the equivalent of a function parameter, the expression "x*x" is equivalent to the return value, so lambda does not need and cannot have a return.

The anonymous function itself is a function object, or you can assign an anonymous function to a variable and then use the variable to invoke the function. The anonymous function is suitable for writing simple functions because no function commands are required and no function name conflicts are created.

#!/usr/bin/python#coding=utf-8importlambda x : x * xprint f(5)#直接调用print (lambda x : x * x)(5)#结合map使用print map(lambda x : x * x, range(5))

Output:

2525[014916]

Python anonymous function lambda