deffind_all_occurrences(string,sub_string):positions=[]start=0whileTrue:position=string.find(sub_string,start)ifposition==-1:breakpositions.append(position)start=position+1returnpositions# 示例text="Hello, hello, hello, World!"sub_text="hello"positions=find_all_occurrences(text.lower(),sub_text....
deffind_all_occurrences(string,sub_string):occurrences=[]start=0whileTrue:index=string.find(sub_string,start)ifindex==-1:breakoccurrences.append(index)start=index+1returnoccurrences# 示例用法string="abracadabra"sub_string="a"occurrences=find_all_occurrences(string,sub_string)print(occurrences)# 输出 ...
如果找不到，则返回-1，实例代码如下：>>>string='笨鸟工具，x1y1z1.com'>>>string.find('笨鸟')...
To check if a string starts or ends with a pattern: if re.match(r"^Search", text): print("Starts with 'Search'") if re.search(r"patterns.$", text): print("Ends with 'patterns.'") 4. Finding All Matches To find all occurrences of a pattern in a string: all_matches = re.fin...
>>> str='string learn' >>> str.startswith('str') #判断字符串以'str'开头 True >>> str.endswith('arn') #判读字符串以'arn'结尾 True 字符串搜索定位与替换 >>> str='string lEARn' >>> >>> str.find('a') #查找字符串,没有则返回-1,有则返回查到到第一个匹配的索引 ...
Return the number of non-overlapping occurrences of substring sub in the range [start, end]. Optional arguments start and end are interpreted as in slice notation. str.decode([encoding[, errors]]) 解码 Decodes the string using the codec registered for encoding. encoding defaults to the default...
python的string模块 1.字符串属性方法操作: 1.>字符串格式输出对齐 1 2 3 4 5 6 7 8 9 10 11 >>> str = "Python stRING" >>> print str.center(20) #生成20个字符长度,str排中间 Python stRING >>> print str.ljust(20) #生成20个字符长度,str左对齐 Python stRING >>> print str.rjust...
Python Find String in List usingcount() We can also usecount()function to get the number of occurrences of a string in the list. If its output is 0, the string is not present in the list. l1=['A','B','C','D','A','A','C']s='A'count=l1.count(s)ifcount>0:print(f'{...
re.sub(pattern, repl, string, count=0, flags=0) 官方文档 代码语言:javascript 代码运行次数:0 运行 AI代码解释 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...
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 ...