importre# 从后往前查找字符串deffind_last_occurrence(string,pattern):match=re.search(pattern,string[::-1])ifmatch:returnlen(string)-match.start()-match.end()else:return-1 1. 2. 3. 4. 5. 6. 7. 8. 9. 上述代码中,string是待查找的字符串,pattern是待查找的正则表达式。search()方法在字符...
# 定义字符串和目标字符input_string="Find the last occurrence of character in this string"target_char="i"# 使用 rfind 方法查找目标字符最后一次出现的位置last_position=input_string.rfind(target_char)# 检查返回值iflast_position!=-1:print(f"The last occurrence of '{target_char}' is at position...
- `find_last_occurrence` 函数:定义了一个函数,接收两个参数:`input_string`(输入字符串)和 `target_char`(目标字符)。使用字符串的 `rfind()` 方法来从右向左查找 `target_char` 的位置,并返回最后一次出现的索引。如果未找到,则返回 `-1`。 - 测试函数:使用示例字符串 `"hello world, hello python"...
Python Code: # Define a function called 'last_occurrence' that finds the last occurrence of a character 'ch' in a list of characters 'l1'.deflast_occurrence(l1,ch):# Join the list of characters into a single string and find the last index of the character 'ch'.return''.join(l1).ri...
str.find(sub[, start[, end]])在字符串中查找sub,找到后返回位置,没找到返回-1. Return the lowest index in the string where substring sub is found, such that sub is contained in the range [start, end]. Optional arguments start and end are interpreted as in slice notation. Return -1 if...
Python String: Exercise-50 with SolutionWrite a Python program to split a string on the last occurrence of the delimiter.Sample Solution:Python Code:# Define a string 'str1' containing a comma-separated list of characters. str1 = "w,3,r,e,s,o,u,r,c,e" # Split the string 'str1'...
还可以使用 string 函数来报告字符串属性,如子串的长度或位置,例如: string 用法2 代码语言:javascript 复制 >>>importstring>>>s="mary had a little lamb">>>string.find(s,'had')5>>>string.count(s,'a')4 最后,string 提供了非常 Python 化的奇特事物。.split() 和 .join() 对提供了在字符串和...
str.find(sub[, start[, end]])在字符串中查找sub,找到后返回位置,没找到返回-1. Return the lowest index in the string where substring sub is found, such that sub is contained in the range [start, end]. Optional arguments start and end are interpreted as in slice notation. Return -1 if...
Split the string at the last occurrence of sep, and return a 3-tuple containing the part before the separator, the separator itself, and the part after the separator. If the separator is not found, return a 3-tuple containing two empty strings, followed by the string itself. ...
6.8.find() It finds the first occurrence of the specified value. It returns-1if the specified value is not found in the string. find()is same as theindex()method, only difference is that theindex()method raises an exception if the value is not found. ...