https://stackoverflow.com/a/1038845 https://www.geeksforgeeks.org/python-remove-the-given-substring-from-end-of-string/
You can extract asubstringfrom a string by using slice. Format:[start:end:step] [:]extracts the all string [start:]fromstartto the end [:end]from the beginning to theend - 1offset [start:end]fromstarttoend - 1 [start:end:step]fromstarttoend - 1, skipping characters bystepjupyter not...
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. Raises ValueError when the substring is not found. S.index(sub[, start[, end]]) -> int .index(sub[, start...
center(s, width[, fillchar]) -> string 将字符串按照特定的宽度width居中,非字符部分用fillchar填充,默认为空格。在字符串长度大于width时,不会截断字符串 count(s, *args) count(s, sub[, start[,end]]) -> int 返回字符串中sub在start到end间出现过的次数 expandtabs(s, tabsize=8) expandtabs(s ...
Return centered in a string of length width. str.count(sub[, start[, end]]) Return the number of non-overlapping occurrences of substring sub in the range [start, end]. 可以只是一个字符或者一个字符pattern, 也可以使用 str.count(str[1:4]) 这种切片 count 的方式。
a nice string representation of the object. | If the argument is a string, the return value is the same object. | | Method resolution order: | str | basestring | object | | Methods defined here: | | __add__(...) | x.__add__(y) <==> x+y | | __contains__(...) | x...
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. s.find('peach',8)# 从index 7 开始往后找 ...
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。 语法:str.rindex(sub, start, end) -> int 返回整数。
) 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...
Python supports both indexing, which extracts individual characters from a string, and slicing, which extracts a substring (or slice). To slice, you indicate a range in the format start:end. The start position is included in the returned substring, but the end position is excluded:Python Copy...