What is the usage of range function in python

Usage of range function in python: [range()] function can create a list of integers, generally used in for loops. The function syntax is [range(start, stop[, step])], where start is Start counting, stop means stop, and step means step size.

The operating environment of this tutorial: Windows 7 system, python version 3.9, DELL G3 computer.

Usage of range function in python:

range()function can create a list of integers and is generally used in for loops.

Note: Python3 range() returns an iterable object (type is object), not a list type, so the list will not be printed when printing.

Function syntax

range(start, stop[, step])

Parameter description:

• start: Counting starts from start. The default is to start from 0. For example, range(5) is equivalent to range(0, 5);

• stop: counts to the end of stop, but does not include stop. For example: range (0, 5) is [0, 1, 2, 3, 4] without 5

• step: step size, default is 1. For example: range(0, 5) is equivalent to range(0, 5, 1)

Example

>>>range(10) # 从 0 开始到 10 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>> range(1, 11) # 从 1 开始到 11 [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] >>> range(0, 30, 5) # 步长为 5 [0, 5, 10, 15, 20, 25] >>> range(0, 10, 3) # 步长为 3 [0, 3, 6, 9] >>> range(0, -10, -1) # 负数 [0, -1, -2, -3, -4, -5, -6, -7, -8, -9] >>> range(0) [] >>> range(1, 0) []

The following is the use of range in for, loop out Each letter of runoob:

>>>x = 'runoob' >>> for i in range(len(x)) : ... print(x[i]) ... r u n o o b >>>

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