Python anonymous functions, map(), reduce(), filter()

Python anonymous functions, map(), reduce(), filter()

Anonymous function: simplify function definition

1. Format :
lambda x, y: operation

2. Anonymous function as a parameter



3. map()

2 parameters, 1 is a function, 1 is Iterable.
The map applies the incoming parameters to each element of the sequence in turn, and returns the result as a new Iterator .

4、reduce（）

Act on two numbers 5 and 3 at a time, do cumulative operation

5, filter()