The index method can’t return a number because the substring isn’t there, so we get a value error instead: In order to avoid thisTraceback Error, we can use the keywordinto check if a substring is contained in a string. In the case of Loops, it was used for iteration, whereas in...
print(x) # My name is Lokesh Gupta and age is 38 6.11. index() 它在给定的字符串中查找指定值的第一次出现。 如果找不到要搜索的值,则会引发异常。 字符串index() txt = "My name is Lokesh Gupta" x = txt.index("e") print(x) # 6 x = txt.index("z") # ValueError: substring not...
ValueError: substring not found Note:Index in Python starts from0and not1. So the occurrence is19and not20. Example 2: index() With start and end Arguments sentence ='Python programming is fun.'# Substring is searched in 'gramming is fun.' print(sentence.index('ing',10)) # Substring ...
def find(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ """ 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 ...
"I love python".index("k") #索引字符串不存在,报错 ValueError: substring not fou 16、rindex() 描述:rindex() 方法返回子字符串最后一次出现在字符串中的索引位置,该方法与rfind()方法一样,可以规定字符串的索引查找范围[star,end),只不过如果子字符串不在字符串中会报一个异常。
"I love python".rindex('o')11"I love python".index('o')3"I love python".rindex('k')ValueError:substringnotfound"I love python".rfind('k' 五、字符串格式化 17、format() 描述:Python2.6 开始,新增了一种格式化字符串的函数 str.format(),它增强了字符串格式化的功能。基本语法是通过 {} 和 ...
text="Python is a powerful programming language"sub_string="programming"match=re.search(sub_string,text)ifmatch:start_index=match.start()end_index=match.end()print(f"The substring '{sub_string}' is found from index{start_index}to{end_index}")else:print(f"The substring '{sub_string}' is...
find(), rfine(), index(), rinex(), count() 查找统计 s="apple, peach, banana, peach, pear" 1. s.find('peach')# 返回第一次出现的位置 1. 7 1. Docstring: S.find(sub[, start[, end]]) -> int Return the lowest index in S where substring sub is found, ...
python没有substring函数,因为直接使用str[start:end]就可以啦。字母处理 全部大写:str.upper()全部小写:str.lower()大小写互换:str.swapcase()首字母大写,其余小写:str.capitalize()首字母大写:str.title()print '%s lower=%s' % (str,str.lower())...
ValueError: substring not found 说明:在尝试查找一个子字符串时,该子字符串未在目标字符串中找到。这个错误可能会在使用字符串的 index、find、rfind 等方法时触发。解决方案:搜索前检查。 ZeroDivisi: division by zero 说明:0 不能用作除数。可能的原因:执行除法、整除或取余运算时,使用 0 作为除数。解决方案...