Lambda

Python Lambda 简明记录

背景知识

为了更深入的了解 Lambda,你需要了解什么是 函数式编程

Source

How to Use Python Lambda Functions – Real Python

Syntax of lambda

No Statements

A lambda function can’t contain any statements. In a lambda function, statements like return, pass, assert, or raise will raise a SyntaxError exception.

Single Expression

Type Annotations

不支持 Type Check.

IIFE

> > > (lambda x: x * x)(3)  
9

Arguments

>>> (lambda x, y, z: x + y + z)(1, 2, 3)
6
>>> (lambda x, y, z=3: x + y + z)(1, 2)
6
>>> (lambda x, y, z=3: x + y + z)(1, y=2)
6
>>> (lambda *args: sum(args))(1,2,3)
6
>>> (lambda **kwargs: sum(kwargs.values()))(one=1, two=2, three=3)
6
>>> (lambda x, *, y=0, z=0: x + y + z)(1, y=2, z=3)
6