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...
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 ...
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 ...
"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 ...
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, ...
In the final output, we find that a substring is generated which starts from the beginning of the string and ends at the position where endIndex is specified. Using complete string ([:]) When in the process of generating a substring from the string, the start index and the end index are...
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())...
def rfind(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ (返回字符串最后一次出现的位置(从右向左查询),如果没有匹配项则返回-1) """ S.rfind(sub[, start[, end]]) -> int Return the highest index in S where substring sub is found, such that sub...
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...
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 ...