Another way to check if a string contains a substring in Python is by using thefind()method. It returns the index of the first occurrence of the substring within the string. If the substring is not found, it returns -1. Here’s an example: sentence = "The quick brown fox jumps over ...
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The python str class has a __contains__() method that will check if a python string contains a substring. It will return true if it’s found and will return false if it’s not. You will notice that the method name is wrapped in two underscores. This prevents this method from being ...
contains+string: str+substring: str+check() : bool # YAML配置示例contains_config:substring:"目标字符串"string:"源字符串" 1. 2. 3. 4. // JSON配置示例{"contains_config":{"substring":"目标字符串","string":"源字符串"}} 1. 2. 3. 4. 5. 6. 7. 实战应用 在实际业务场景中,使用contai...
这里,我们使用in运算符来判断substring是否在target_string中。如果存在,就打印相应的消息。 3. 使用str.find()方法判断 str.find()方法返回子字符串在目标字符串中第一次出现的位置,如果未找到则返回 -1。 # 使用 str.find() 方法判断position=target_string.find(substring)ifposition!=-1:print(f"'{substrin...
ValueError: substring not found >>> str.index("n") #同find类似,返回第一次匹配的索引值 4 >>> str.rindex("n") #返回最后一次匹配的索引值 11 >>> str.count('a') #字符串中匹配的次数 0 >>> str.count('n') #同上 2 >>> str.replace('EAR','ear') #匹配替换 'string learn' >...
You can also use the membership operators to determine if a string contains a substring:Python >>> greeting = "Hi, welcome to Real Python!" >>> "Hi" in greeting True >>> "Hi" not in greeting False >>> "Hello" in greeting False >>> "Hello" not in greeting True For the string...
To check if a string contains only digits, alphabetic characters, or alphanumeric characters: print("123".isdigit()) # True print("abc".isalpha()) # True print("abc123".isalnum())# True 12. String Slicing To extract a substring using slicing: s = "slice me" sub = s[2:7] # From...
string_function = str(123.45)# str converts float data type to string data type # Another str function another_string_function = str(True)# str converts a boolean data type to string data type # An empty string empty_string =''
<bool> = in <str> # Checks if string contains the substring. <bool> = <str>.startswith() # Pass tuple of strings for multiple options. <int> = <str>.find() # Returns start index of the first match or -1. <int> = <str>.index() # Same, but raises ValueError if there's ...