関連ワード:  python if a string is in a string    python check if a string is in a string    python check if a string is in a list of strings    python check if a string is in another string    python check if a string exists in a string    python if string is in a list of strings    python if string is in another string    python check if a string contains a string    python check if string is in string case insensitive    python if string is not in string