Finding All Occurrences Since theindex()only returns the first match to an object, you can use list comprehension, or generator expression if you need the positions of more matches in the list. Here is how: list_numbers=[3,1,2,3,3,4,5,6,3,7,8,9,10][ifori,ninenumerate(list_number...
原因:find() 只返回第一个匹配项的索引。 解决方法:使用循环和切片来查找所有匹配项。 代码语言:txt 复制 def find_all_occurrences(text, sub): occurrences = [] start = 0 while True: index = text.find(sub, start) if index == -1: break occurrences.append(index) start = index + 1 return ...
In this example, thecount()method is called onmy_listwith “banana” as the argument. The method returns the number of occurrences of “banana” in the list, which is 2. This means “banana” appears twice in the list. Thecount()method is a simple and efficient way to check the frequ...
mylist = list(filter((r_item).__ne__, mylist)) print(mylist) # Remove all occurrences in List using Filter mylist = [21, 5, 8, 52, 21, 87] r_item = 21 # keep the item for all its occurrence mylist = list(filter((r_item).__eq__, mylist)) print(mylist) 1. 2. 3...
def find_all_occurrences(self, string, sub_string): ''' Return a list of all the positions of the sub_string in the string.''' positions = [] start = 0 while True: position = string.find(sub_string, start) if position == -1: ...
to find : " + substr) # using list comprehension + startswith() # All occurrences of ...
count(sub[, start[, end]]) -> int Return the number of non-overlapping occurrences of substring sub in string S[start:end]. Optional arguments start and end are interpreted as in slice notation. """ return 0 def decode(self, encoding=None, errors=None): """ 解码 """ """ S....
sub) Help on function sub in module re: sub(pattern, repl, string, count=0, flags=0) Return the string obtained by replacing the leftmost non-overlapping occurrences of the pattern in string by the replacement repl. repl can be either a string or a callable; if a string, backslash ...
def count(self, value): # real signature unknown; restored from __doc__ (用于统计某个元素在列表中出现的次数) """ L.count(value) -> integer -- return number of occurrences of value """ return 0 1. 2. 3. #!/usr/bin/python aList = [123, 'xyz', 'zara', 'abc', 123]; prin...
Thesplit()function returns a list where the string has been split at each match: Example Split at each white-space character: importre txt ="The rain in Spain" x = re.split("\s",txt) print(x) Try it Yourself » You can control the number of occurrences by specifying themaxsplitpar...