The original string is returned if width is less than or equal to len(s) . str. count ( sub[, start[, end]]) int string.index(sub, start=0, end=None). Returns the first index where sub is found, or raises an error if no such index exists, optionally restricting to [start:end] string.format_map(mapping). Similar to using format with keyword arguments, except the arguments are provided as a mapping. string.index(sub[, start[, end]]). center (width[, fillchar]), Pad the beginning and end of each string to the minimum index (sub[, start, end, devptr]), Same as find but throws an error if arg is not S.index(sub[, start[, end]]) ). "bonbon".index("on") # 1 "bonbon".index("on", 2) # 4 "bonbon".index("on", 2, 5) # error: substring not found (in "nbo"). string· 18 Jan 2019 Returns hash values represented by each string. index(sub[, start, end, devptr]). Same as find but throws an error if arg is not found in all strings.
18 Jan 2019 Returns hash values represented by each string. index(sub[, start, end, devptr]). Same as find but throws an error if arg is not found in all strings. Versus a regular NumPy array of type str or unicode, this class adds the find ( sub[, start, end]), For each element, return the lowest index in the string index ( sub[, start, end]), Like find , but raises ValueError when the substring is not found. 20 Ene 2019 str.index(sub[, start[, end]]). El método str.index devuelve el índice más bajo en el que se encuentre el substring sub en el bloque str[start:end].
2018年11月13日 str.index(sub[, start[, end]] ) 只能返回范围内的第一次出现该元素的iPython.
14 Dec 2006 I needed a version of the string.index(sub) function which returns a list of indices starts = [match.start() for match in re.finditer(re.escape(S), T)]. 10 Mar 2011 Python does not known the type "character"; a character is a string with one element. >>> s="this is a string" Optional arguments start and end are interpreted as in slice notation. Example: S.index(sub [,start [,end]]) -> int. start and end(optional) - substring is searched within str[start:end] Return Value from index() If substring exists inside the string, it returns the lowest index in the string where substring is found. Python String index() Method Example 3. We can also pass start and end index as parameters to make process more customized. str.index(str, beg = 0 end = len(string)) Parameters. str − This specifies the string to be searched. beg − This is the starting index, by default its 0. end − This is the ending index, by default its equal to the length of the string. Return Value. Index if found otherwise raises an exception if str is not found. Example
import re string = 'Happy Birthday' pattern = 'py' print(re.search(pattern, string).span()) ## this prints starting and end indices print(re.search(pattern, string).span()[0]) ## this does what you wanted By the way, if you would like to find all the occurrence of a pattern, instead of just the first one, you can use finditer method index of second repeated character in a string. Ask Question Asked 5 years, 10 months ago. use the str.index(sub,start) method for each occurrence of the user_input in the word and increment start by 1 each time so that you do not wind up getting the same index each time. str.find(sub [, start [, end]])¶ Return the lowest index in the string where substring sub is found, such that sub is contained in the slice s[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 if sub is not found. Python String find() The find() method returns the index of first occurrence of the substring (if found). If not found, it returns -1. The find() method takes maximum of three parameters: sub - It's the substring to be searched in the str string. start and end (optional) - substring is searched within str[start:end] Return Value from find() str.find(sub[, start[, end]]) Return the lowest index in the string where substring sub is found, such that sub is contained in the slice s[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 if sub is not found. Note The find() method should be used only if you need to know the position of sub. >>> str.find('IS', 4) #The start position of 4 means that this search is searching through everything beginning from index of 4 ie: 'ISSIPPI' and thus the seach_item is not found. And the result is index 4 - from the beginning of the original string.