- `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"...
# 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...
为了更好地理解rfind()方法,我们可以创建一个简单的类图来表示字符串和它的方法: String+rfind(substring, start)+find_last_occurrence(text, char_to_find) 在这个类图中,String类有一个rfind()方法,它接受两个参数:substring是要查找的子字符串,start是搜索的起始位置(可选)。find_last_occurrence是一个示例方...
test="Python Programming"print("String: ",test)# First one character first_character=test[:1]print("First Character: ",first_character)# Last one character last_character=test[-1:]print("Last Character: ",last_character)# Everything except the first one character except_first=test[1:]print...
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...
The Python string index() method can be used to find the starting index of the first occurrence of a substring in a string. In the case the substring is not found in the string then it will raise the error which needs to be handled with the help of the try-exception statement. ...
Split string on last delimiter occurrence. Write 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...
Python String Length In Python, we use thelen()method to find the length of a string. For example, greet ='Hello'# count length of greet stringprint(len(greet))# Output: 5 Run Code String Membership Test We can test if a substring exists within a string or not, using the keywordin....
This Python function returns the position of a string within a string, giving the character basis of the first occurrence of that string. Example: text = “Hello, world!” print(text.index(“world”)) Result: 7 6. text.isalnum(): Determines whether all characters are alphanumeric ...
print(a.find("wolf", 15)) Here we search for a substring from the 15th character until the end of the string. We find the second occurrence of the substring. The line prints 35. print(a.rfind("wolf")) Therfindlooks for a substring from the end. It finds the second occurrence of ...