Theindex()method is almost the same as thefind()method, the only difference is that thefind()method returns -1 if the value is not found. (See example below) Syntax string.index(value, start, end) Parameter Values ParameterDescription ...
index() Return Value If substring exists inside the string, it returns the lowest index in the string where substring is found. If substring doesn't exist inside the string, it raises aValueErrorexception. Theindex()method is similar to thefind()method for strings. The only difference is that...
Theindexmethod in particular, returns the index of the given substring, inside the string.The substring that we pass, can be as long or as short as we want.And what happens if the string doesn’t have the substring we’re looking for?The index method can’t return a number because the...
十、python3 中常用的字符串方法(method) 方法的调用语法: 对象.方法名(方法传参) 字符串的属性读用法示例: 'abc'.isalpha() #True判断'abc'是否是字母 123.isalpha() # 报错 常用字符串方法: 如下假设字符串变量名为S 空白字符 是指空格,水平制表符(\t),换行符(\n)等不可见的字符 详见: help(str) ...
Python3 index()方法Python3 字符串描述index() 方法检测字符串中是否包含子字符串 str ,如果指定 beg(开始) 和 end(结束) 范围,则检查是否包含在指定范围内,该方法与 python find()方法一样,只不过如果str不在 string中会报一个异常。语法index()方法语法:...
find 是从左起始查找,对应的从右开始查找的方法是rfind() Method Description: This method returns the last index where the substringstris found, or .1 if no such index exists, optionally restricting the search to string[beg:end]. Syntax: ...
print string.whitespace 2. string Method(方法) Below are listed the string methods which both 8-bit strings and Unicode objects support. Note that none of these methods take keyword arguments. In addition,Python’s strings support the sequence type methods described in the Sequence Types — str...
String MethodsPython has a set of built-in methods that you can use on strings.Note: All string methods return new values. They do not change the original string.MethodDescription capitalize() Converts the first character to upper case casefold() Converts string into lower case center() ...
method 以str = ‘today is a Nice day!’ 为例 str.capitalize() # Today is a nice day! 第一个字母大写,其余小写【3.8版本更新】 str.casefold() # today is a nice day! 返回原字符串消除大小写的副本。 str.count(sub[, start[, end]]) # 返回子字符串 sub 在 [start, end] 范围内非重叠...
The.find()method returns a-1when the word isn't found, or it returns the index (the number representing the place in the string). This is how it would behave if you're searching for the wordMars: Python temperatures ="""Saturn has a daytime temperature of -170 degrees Celsius, while...