1>>>importre2>>> re.sub('[abc]','o','Mark')3'Mork'4>>> re.sub('[abc]','o','caps')5'oops'6>> replace 用法介绍: 1>>>a2'asds23DFG34'3>>> a.replace('s','M')#全部替换4'aMdM23DFG34'5>>> b ='adfafafafa'6>>> b.replace('a','M',3)#指定个数的替换7'MdfMfM...
replace(old, new[, count]) -> string Return a copy of string S with all occurrences of substring old replaced by new. If the optional argument count is given, only the first count occurrences are replaced. """ return "" def rfind(self, sub, start=None, end=None): """ S.rfind(...
AI代码解释 >>>a='abcdefghijklmnopqrstuvwxyz'>>>a'abcdefghijklmnopqrstuvwxyz'>>>a[0]'a'>>>a[3]'d'>>>a[26-1]'z'>>>a[-1]'z'>>>a[-26]'a'>>>a[-30]Traceback(most recent call last):File"<pyshell#91>",line1,in<module>a[-30]IndexError:string index outofrange replace()...
print('abdde'.lstrip())print('***abdcd'.lstrip('*')) 11.replace()方法: ''' replace() 方法: Return a copy with all occurrences of substring old replaced by new. 返回一个字符串的副本,使用新的子字符串替换旧的子字符串 count Maximum number of occurrences to replace. -1 (the default ...
group by name group_concat()指定分隔符情况 with sp as( select t.name, substring_index(substring_index(t.subject,';',m.help_topic_id+1),';',-1) as row_str from tmp t join mysql.help_topic m on m.help_topic_id<(length(t.subject)-length(replace(t.subject,';',''))+1)) ...
) S.find(sub [,start [,end]]) -> int Return the lowest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 on failure. In [102]: s1.find("i") #元素第一次...
index('or', 9)) # ValueError: substring not found 说明:find方法找不到指定的字符串会返回-1,index方法找不到指定的字符串会引发ValueError错误。 find和index方法还有逆向查找(从后向前查找)的版本,分别是rfind和rindex,代码如下所示。 s = 'hello world!' print(s.find('o')) # 4 print(s.rfind('...
print(txt.index("q")) #输出结果:ValueError:substring not found 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. rindex( ):在字符串中搜索指定的值,并返回它被找到的最后位置,否则引发异常 string.rindex(value,start,end) #value:必需,要检索的值;start:可选,从何处开始检索,默认是0;end:可选,在...
272 """ 273 pass 274 275 def replace(self, old, new, count=None): # real signature unknown; restored from __doc__ 276 """ 277 S.replace(old, new[, count]) -> str 278 279 Return a copy of S with all occurrences of substring 280 old replaced by new. If the optional argument...
"# Index 0print(main_string[0])# Index 1print(main_string[1])# Check if Index 1 is whitespaceprint(main_string[1].isspace())# Slicing 1print(main_string[0:11])# Slicing 2:print(main_string[-18:])# Slicing and concatenationprint(main_string[0:11]+". "+main_string[-18:])...