如何检查Python列表中是否存在元组? [英] How to check whether a tuple exists in a Python list?

问题描述

我是Python的新手，我正在尝试检查列表l=[[a,b],[c,d],[d,e]]中是否存在一对[a,b].我搜索了许多问题，但找不到精确的解决方案.请问有人可以告诉我正确，最短的方法吗?

I am new to Python, and I am trying to check whether a pair [a,b] exists in a list l=[[a,b],[c,d],[d,e]]. I searched many questions, but couldn't find precise solution. Please can someone tell me the right and shortest way of doing it?

我跑步时:

a=[['1','2'],['1','3']]
for i in range(3):
    for j in range(3):
        if [i,j] in a:
            print a

输出空白

那如何实现呢?

推荐答案

由于'1' != 1以及['1','2'] != [1,2] 如果您希望它正常工作，请尝试:

The code does not work because '1' != 1 and, consequently, ['1','2'] != [1,2] If you want it to work, try:

a=[['1','2'],['1','3']]
for i in range(3):
    for j in range(3):
        if [str(i), str(j)] in a: # Note str
            print a

(但是使用in或如上所述的集合更好)

(But using in or sets as already mentioned is better)

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