deffind_all_occurrences_list_comprehension(string,sub_string):positions=[iforiinrange(len(string)-len(sub_string)+1)ifstring[i:i+len(sub_string)].lower()==sub_string.lower()]returnpositions# 示例text="Hello, hello
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...
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....
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...
str2='Hello\t999'print str2.expandtabs()#寻找子序列位置,没有找到返回-1,返回了是1print str.find('a')#寻找子序列的位置,没有找到就报错 print str.index('e')#字符串的格式化输出,也就是占位符 age=20name='wuya'print'name is {0},and age is {1}'.format(name,age)#判断是否是字母和数字...
to find : " + substr) # using list comprehension + startswith() # All occurrences of ...
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: ...
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 ...
Find All To select data from a table in MongoDB, we can also use thefind()method. Thefind()method returns all occurrences in the selection. The first parameter of thefind()method is a query object. In this example we use an empty query object, which selects all documents in the collecti...
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...