Python_Lambda

lambda 為 Python 的關鍵字 (keyword) 之一，用來建立無名函數 (anonymous function) 。

https://docs.python.org/3/reference/expressions.html#lambda

lambda_expr        ::=  "lambda" [parameter_list]: expression
lambda_expr_nocond ::=  "lambda" [parameter_list]: expression_nocond

Lambda expressions (sometimes called lambda forms) are used to create anonymous functions. The expression lambda arguments:expression yields a function object. The unnamed object behaves like a function object defined with

def <lambda>(arguments):
    return expression

See section Function definitions for the syntax of parameter lists. Note that functions created with lambda expressions cannot contain statements or annotations.

範例:

f = lambda x: x ** x

雷同

def f(x):

return x**x

多變數用法

g = lambda x, y: x * y