The Python startswith() method returns True if the string starts with the specified value, otherwise False. This method is very useful we need to search for a substring in a text. It can also take an optional two parameters to specify the starting and ending positions of the substring....
The methods in this section provide various ways to search the target string for a specified substring.Each method supports optional start and end arguments. These arguments mean that the action of the method is restricted to the portion of the target string starting with the character at index ...
Return -1 on failure."""return0#从右边查找子序列在字符串第一次出现的位置,会抛出异常ValueError: substring not founddefrindex(self, sub, start=None, end=None):#real signature unknown; restored from __doc__"""S.rindex(sub[, start[, end]]) -> int Like S.rfind() but raise ValueError ...
503 def capitalize(s): 504 """capitalize(s) -> string 505 506 Return a copy of the string s with only its first character 507 capitalized. 508 509 """ 510 return s.capitalize() 511 512 # Substring replacement (global) 513 def replace(s, old, new, maxreplace=-1): 514 """replace...
On line 9, the <pos> and <endpos> parameters effectively restrict the search to the substring starting with character 6 and going up to but not including character 9 (the substring 'bar'), which doesn’t contain any digits.If you specify <pos> but omit <endpos>, then the search ...
replace(old, new[, count]) -> string 244 245 Return a copy of string S with all occurrences of substring 246 old replaced by new. If the optional argument count is 247 given, only the first count occurrences are replaced. 248 """ 249 return "" 250 251 def rfind(self, sub, start=...
The Python string index() method can be used to find the starting index of the first occurrence of a substring in a string. In the case the substring is not found in the string then it will raise the error which needs to be handled with the help of the try-exception statement. ...
237 """ 238 pass 239 240 def replace(self, old, new, count=None): 241 """ 替换 """ 242 """ 243 S.replace(old, new[, count]) -> string 244 245 Return a copy of string S with all occurrences of substring 246 old replaced by new. If the optional argument count is 247 given...
Replace(old,new) replaces the old occurrence of the substring old with the substring new. Find() reports the offset where the first occurrence of the substring occurs. >>> banner = “FreeFloat FTP Server” >>> print banner.upper() FREEFLOAT FTP SERVER >>> print banner.lower() freefloat...
237 """ 238 pass 239 240 def replace(self, old, new, count=None): 241 """ 替换 """ 242 """ 243 S.replace(old, new[, count]) -> string 244 245 Return a copy of string S with all occurrences of substring 246 old replaced by new. If the optional argument count is 247 given...