frame = pd.Dataframe({'a' : ['the cat is blue', 'the sky is green', 'the dog is black']})frame a0 the cat is blue1 the sky is green2 the dog is black该
str.contains方法接受正则表达式模式：
mylist = ['dog', 'cat', 'fish']pattern = '|'.join(mylist)pattern'dog|cat|fish'frame.a.str.contains(pattern)0 True1 False2 TrueName: a, dtype: bool
由于支持正则表达式模式，因此您还可以嵌入标志：
frame = pd.Dataframe({'a' : ['Cat Mr. Nibbles is blue', 'the sky is green', 'the dog is black']})frame a0 Cat Mr. Nibbles is blue1 the sky is green2 the dog is blackpattern = '|'.join([f'(?i){animal}' for animal in mylist]) # python 3.6+pattern'(?i)dog|(?i)cat|(?i)fish'frame.a.str.contains(pattern)0 True # Because of the (?i) flag, 'Cat' is also matched to 'cat'1 False2 True
