Lambda expression of Python learning

A lambda expression is an anonymous function, a function that does not have a function name. A lambda expression can represent closures (notice differs from the traditional mathematical sense).

1. Lambda expression in Python

A lambda expression is a special type of defined function in Python that allows you to define an anonymous function. Unlike other languages, the function body of a Python lambda expression can have only one statement, which is the return value expression statement. Its syntax is as follows:

Lambda parameter list: function return value expression statement The following is an example of a lambda expression:

1234	#!/usr/bin/envpythonli=[{"age":20,"name":"def"},{"age":25,"name":"abc"},{"age":10,"name":"ghi"}]li=sorted(li,key=lambdax:x["age"])print(li)

If you don't use a lambda expression and write a regular function, you need to do this:

123456

#!/usr/bin/envpythondefcomp(x):    returnx["age"]li=[{"age":20,"name":"def"},{"age":25,"name":"abc"},{"age":10,"name":"ghi"}]li=sorted(li,key=comp)print(li)

2. There are lambda expressions in C #, Java, C + +

Lambda expression of Python learning