python如何计算列表元素中的单词

Question

下面的代码返回一个列表：

[['We test robots'], ['Give us a try'], [' ']]

现在我需要计算每个元素中的单词， 我如何在不导入任何包的情况下在 Python 中实现这一点。在上面我应该得到三个列表元素的 3,4 和 1。 谢谢

import re
S ="We test robots.Give us a try? "

splitted = [l.split(',') for l in (re.split('\.|\!|\?',S)) if l]

print (splitted)

Answer 1

有多种方法可以做到这一点，这里有两种：

# using map
list(map(lambda x: len(x[0].split()) if len(x[0]) > 1 else 1, l))

[3, 4, 1]

# using list comprehension
[len(x[0].split()) if len(x[0]) > 1 else 1 for x in l]

[3, 4, 1]

Answer 2

我假设你想做这样的事情：

import re
S ="We test robots.Give us a try? "

splitted = [l.split(',') for l in (re.split('\.|\!|\?',S)) if l]

print(splitted)

for sentence in splitted:
    count = len(sentence[0].split())
    if not count and sentence[0]:
        count += 1
    print(count)

会打印：

[['We test robots'], ['Give us a try'], [' ']]
3
4
1

Answer 3

如果您的所有输入元素都是列表，并且所有分隔符都是空格，那么您可以在不导入任何内容的情况下执行此操作：

input = [['We test robots'], ['Give us a try'], [' ']]
output = []

for item in input:
   output.append(len(item[0].split()))

print(output)  # [3, 4, 0]

如果你想让一个空项打印 1 而不是 0，只需检查值是否为 0。

Answer 4

用于计算每个元素中的单词

import re
S ="We test robots.Give us a try? "

splitted = [l.split(',') for l in (re.split('\.|\!|\?',S)) if l]

item =[]
for i in splitted:
    item.append(len(i[0].split()))

print(item)

输出将是 [3,4,0]

Answer 5

只是练习...

def word_counter(passlist):
    do_count = lambda x: len(x.split())
    result=[]

    for elem in passlist:
        if isinstance(elem, list):
            result += [word_counter(elem)]
        elif isinstance(elem, str):
            result += [do_count(elem)]

    return result

print(word_counter([['We test robots'], ['Give us a try'], [' ']]))
# output: [[3], [4], [0]]

print(word_counter(['First of all', ['One more test'], [['Trying different list levels'], [' ']], 'Something more here']))
# output: [3, [3], [[4], [0]], 3]