Other methods give you information about the string itself. The methodcountreturns how many times a given substring appears within a string. The methodendswithreturns whether the string ends with a certain substring, whereas the methodstartswithreturns whether the string started with a substring: Ano...
6.substring() 语法:字符串.substring(开始索引,结束索引) 返回值:截取出来的一部分数据 注意:包前不包后 不支持负数 var str = 'hello word' //从索引2的位置截取到索引7的位置 var res = str.substring(1, -2) console.log(res); 1. 2. 3. 4. 7.slice 语法:字符串.slice(开始索引,结束索引) ...
string = "Hello, World!" # 截取字符串的前五个字符 substring = string[0:5] print(substring) # 输出: Hello # 截取字符串的第六个字符到倒数第二个字符 substring = string[5:-1] print(substring) # 输出: , World # 截取字符串的最后五个字符 substring = string[-5:] print(substring) # 输...
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' >...
rfind() but raise ValueError when the substring is not found. """ return 0 def rjust(self, width, fillchar=None): """ S.rjust(width[, fillchar]) -> string Return S right-justified in a string of length width. Padding is done using the specified fill character (default is a ...
A string is a digit string if all characters in the string are digits and there is at least one character in the string. """ pass 翻译:如果字符串是数字字符串则返回True,否则返回False 如果字符串里面的所有字符都是数字,则是个数字字符串,并且这个字符串不为空字符串。
需要提醒大家注意的是，在进行索引操作时，如果索引越界（正向索引不在0 到 N-1 范围，负向索引不在 -1 到 -N 范围），会引发 IndexError 异常，错误提示信息为：string index out of range（字符串索引超出范围）。如果要从字符串中取出多个字符，我们可以对字符串进行切片，运算符是 [i:j:k] ，其中 i ...
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 =''
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 = '' ...
| Like S.rfind() but raise ValueError when the substring is not found. | | rjust(...) | S.rjust(width[, fillchar]) -> string | '''右对齐''' | Return S right-justified in a string of length width. Padding is | done using the specified fill character (default is a space) ...