我有一個字符串列表。我想檢查該列表中的任何字符串是否出現在保存在字符串 var 中的更大文檔中。我知道這可以通過循環輕松完成，但我將多次執行此操作（以及除此之外的另一個循環），所以我想知道是否有更有效的方法來代替 for 循環。我的方法是這樣的：main_words = ... # List of words I want to checktweet = ... # String containing the text I want to check for word appearancefor word in main_words: if word in tweet: .......
1 回答
慕村225694
TA貢獻1880條經驗 獲得超4個贊
您可以使用集合來獲取此信息：
text = """I have a list of strings. I would like to check if any of the strings of
that list appears on a bigger document saved on a string var.
I know this can easily be done with a loop, but I will be doing this operation so
many times (and another loops apart of this) so I was wondering if there is any
more efficient way to do it instead of a for loop."""
words = set(["would","this","do","if","supercalifragelisticexpialigetic"])
text_words = text.split()
# show all that are in it
print(words.intersection(text_words)) # words & set(text_words)
# show all that are not in it
print(words.difference(text_words)) # words - set(text_words)
輸出：
set(['this', 'do', 'would', 'if']) # words & set(text_words)
set(['supercalifragelisticexpialigetic']) # words - set(text_words)
要獲得計數，請執行以下操作：
from collections import Counter
counted = Counter(text_words)
for w in words:
print(w, counted.get(w))
輸出：
do 1
would 1
supercalifragelisticexpialigetic None
if 2
this 2
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