Lambda in Python and Pythonlambda

Lambda in Python and Pythonlambda

Lambda x: x * x is actually

Def f (x ):

Retrun x * x

The keyword lambda indicates an anonymous function, and the x before the colon indicates a function parameter.

An anonymous function can have only one expression, and no return is required. The returned value is the result of this expression.

There is a benefit to using an anonymous function because the function has no name and you don't have to worry about function name conflicts. In addition, an anonymous function is also a function object. You can assign an anonymous function to a variable and use the variable to call the function:

>>> F = lambda x: x * x

>>> F (5)

25

Similarly, an anonymous function can be used as a return value, for example:

Def build (x, y ):

Return lambda: x * x + y * y