在python列表中搜索子字符串 [英] search substring in list in python

问题描述

我需要知道字母b(最好是大写还是小写)是否包含在列表中.

I need to know if the letter b (both uppercase and lowercase preferably) consist in a list.

我的代码:

List1=['apple', 'banana', 'Baboon', 'Charlie']
if 'b' in List1 or 'B' in List1:
    count_low = List1.count('b')
    count_high = List1.count('B')
    count_total = count_low + count_high   
    print "The letter b appears:", count_total, "times."
else:
    print "it did not work"

推荐答案

您需要遍历列表并遍历所有项目，例如:

You need to loop through your list and go through every item, like so:

mycount = 0
for item in List1:
    mycount = mycount + item.lower().count('b')

if mycount == 0:
    print "It did not work"
else:
    print "The letter b appears:", mycount, "times"

您的代码不起作用，因为您尝试在列表中而不是每个字符串中计数'b'.

Your code doesn't work since you're trying to count 'b' in the list instead of each string.

或作为列表理解:

mycount = sum(item.lower().count('b') for item in List1)

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