Python Reverse Sequence Method Instance analysis, python Reverse Sequence instance analysis

Python Reverse Sequence Method Instance analysis, python Reverse Sequence instance analysis

This article describes how to reverse a sequence in Python. We will share this with you for your reference. The details are as follows:

A sequence is the most basic data structure in python. Each element in a sequence has a position-related sequence number, also known as an index. For a sequence with N elements,

Left-to-right index: 0, 1, 2 ,...... N-1

From right to left index:-1,-2,-3 ...... -N

1. Reverse list

>>> l=[1,2,3,4]>>> ll=l[::-1]>>> l[1, 2, 3, 4]>>> ll[4, 3, 2, 1]>>> l=[4,5,6,7]>>> ll=reversed(l)>>> l[4, 5, 6, 7]>>> ll<listreverseiterator object at 0x06A07F70>>>> list(ll)[7, 6, 5, 4]

2. Inverted tuples

>>> t=(2,3,4,5)>>> tt=t[::-1]>>> t(2, 3, 4, 5)>>> tt(5, 4, 3, 2)>>> t=(4,5,6,7)>>> tt=reversed(t)>>> t(4, 5, 6, 7)>>> tt<reversed object at 0x06A07E90>>>> tuple(tt)(7, 6, 5, 4)

3. Reverse the string

>>> s='python'>>> ss=s[::-1]>>> s'python'>>> ss'nohtyp'>>> s='nohtyp'>>> ss=''.join(reversed(s))>>> s'nohtyp'>>> ss'python'