text="This is a sample text."if"hello"notintext:print("The string does not contain the substring.") 1. 2. 3. 在上面的代码中,我们首先定义了一个字符串变量text,然后使用not in运算符来判断字符串"hello"是否不在变量text中。如果不在,则输出提示信息。 除了使用not in运算符,我们还可以使用find(...
print(‘String does not contain substring’) The first argument is the string you are searching, and the second is the substring you are looking for. It also returns a Boolean. But these methods aren’t the only ones you can use to determine the existence of a substring in a string in ...
text="Hello, world!"substring="Python"ifsubstringnotintext:print(f"The string '{text}' does not contain '{substring}'") 1. 2. 3. 4. 在上面的代码中,我们首先定义了一个字符串text和一个子字符串substring。然后使用not in操作符判断substring是否不在text中,如果是,则打印相应的提示信息。 2. 使...
print("The string does not contain 'CA'") In this example, theinoperator checks if the substring"CA"is present in thestatestring variable, which represents a U.S. state name. The code will output “The string contains ‘CA'” since “California” includes “CA”. Theinoperator is case-...
Perform a string formatting operation. 应该和 原来的 % 差不多。 参考文档:文档 str.index(sub[, start[, end]]) Like find(), but raise ValueError when the substring is not found str.isalnum() Return true if all characters in the string are alphanumeric and there is at least one character...
text="Learning Python is fun!"substring="Python"iftext.find(substring)!=-1:print(f'"{text}" contains "{substring}"')else:print(f'"{text}" does not contain "{substring}"') Copy 3. How to perform a case-insensitive string check?
Return the lowest index in the string where substring sub is found, such that sub is contained in the range [start, end]. Optional arguments start and end are interpreted as in slice notation. Return -1 if sub is not found. str.format(format_string, *args, **kwargs) ...
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the separator itself,andthe part after it. If the separatorisnotfound,returnSandtwo empty strings."""pass def replace(self, old, new, count=None):"""替换"""S.replace(old, new[, count])->string Return a copy of string S with all occurrences of substring old ...
An empty string doesn’t contain any characters, so when you use the built-in len() function with an empty string as an argument, you get 0 as a result.To create multiline strings, you can use triple-quoted strings. In this case, you can use either single or double quotes:Python ...