打印出所有找到的位置: print("The positions of 'hello' in the target string are:")forpositioninposition_list:print(position) 1. 2. 3. 状态图 下面是一个简单的状态图,展示了整个查找过程的状态变化: StartDefineStringsInitializeListLoopFindPositionPrintResults 总结 通过上面的步骤,我们成功实现了在Pytho...
下面是一个示例代码: deffind_multi_fields(str,fields):positions=[]forfieldinfields:position=str.find(field)ifposition!=-1:positions.append(position)returnpositions str2="This is a test string."fields=["is","test"]positions=find_multi_fields(str2,fields)print(positions)# 输出:[2, 5, 10] ...
The find() method returns the lowest index of the substring if it is found in given string. If its is not found then it returns -1. Syntax : str.find(sub,start,end) Parameters : sub :It’s the substring which needs to be searched in the given string. start :Starting position where...
Finding a string in a list is a common operation in Python, whether for filtering data, searching for specific items, or analyzing text-based datasets. This tutorial explores various methods, compares their performance, and provides practical examples to help you choose the right approach. You can...
print("The position of Guru99 is at:", mystring.find("Guru99", 20)) Output: The position of Best site is at: 27 The position of Guru99 is at: -1 Python字符串rfind() Python函数rfind()是从右向左查找。 如果子字符串不存在,则rfind()返回-1。
Where in the text is the first occurrence of the letter "e" when you only search between position 5 and 10?: txt ="Hello, welcome to my world." x = txt.find("e",5,10) print(x) Try it Yourself » Example If the value is not found, the find() method returns -1, but the...
下面的示例演示了这四个函数,指定了所有可选参数。...注意,在这些函数中,string和substring的位置不同: SELECT POSITION('br' IN 'The broken brown briefcase') AS Position,...$FIND函数返回值5,表示字符(“E”)在“BCD”后面的位置: SELECT $FIND('ABCDEG','BCD') AS SubPoint 5 在示例中,通过数字...
span()) #结果 matching string: 123456 position: (6, 12) 2.3、findall 方法 上面的 match 和 search 方法都是一次匹配,只要找到了一个匹配的结果就返回。然而,在大多数时候,我们需要搜索整个字符串,获得所有匹配的结果。 findall 方法的使用形式如下: findall(string[, pos[, endpos]]) 其中,string 是...
my_string.count("fruit", 0, 16) Powered By 1 Powered By The method will return 1. Remember that the starting position is inclusive, but the ending is not. .replace Method Sometimes you will want to replace occurrences of a substring with a new substring. In this case, Python prov...
{}#Dictionary of error functions for each stateself.lexstateeoff = {}#Dictionary of eof functions for each stateself.lexreflags = 0#Optional re compile flagsself.lexdata = None#Actual input data (as a string)self.lexpos = 0#Current position in input textself.lexlen = 0#Length of the...