在Python中查找列表中所有单词的字符数 [英] Finding the amount of characters of all words in a list in Python

问题描述

我正在尝试在单词列表(特别是该列表)中查找字符总数:

I'm trying to find the total number of characters in the list of words, specifically this list:

words = ["alpha","omega","up","down","over","under","purple","red","blue","green"]

我尝试做:

print "The size of the words in words[] is %d." % len(words)

但这只是告诉我列表中有10个单词.

but that just tells me how many words are in the list, which is 10.

任何帮助将不胜感激！

对不起，我的意思是要提到我正在为此做的类是关于for循环的，所以我想知道我是否必须实现forloop才能给我答案，这就是为什么for循环标记在那儿.

Sorry, I meant to mention that the class I'm doing this for is on the topic of for loops, so I was wondering if I had to implement a forloop to give me an answer, which is why the for loop tags are there.

推荐答案

您可以在列表推导中使用len函数，这将创建一个长度列表.

You can use the len function within a list comprehension, which will create a list of lengths

>>> words = ["alpha","omega","up","down","over","under","purple","red","blue","green"]
>>> [len(i) for i in words]
[5, 5, 2, 4, 4, 5, 6, 3, 4, 5]

然后使用生成器表达式简单地sum

Then simply sum using a generator expression

>>> sum(len(i) for i in words)
43

如果您真的在for循环上放下心来.

If you really have your heart set on for loops.

total = 0
for word in words:
    total += len(word)

>>> print total
43

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