您可以使用简单的切片符号 – [::-1] 来翻转字符串。要替换字符串,可以使用 str.replace(old, new, count)。例如, defrreplace(s,old,new):return(s[::-1].replace(old[::-1],new[::-1],1))[::-1]rreplace('Helloworld, hello world, hello world','hello','hi') Python Copy...
defreplace_last_occurrence(s,old,new):# 从字符串末尾开始查找最后一个匹配项的索引index=s.rfind(old)ifindex==-1:# 如果没有找到匹配项,直接返回原字符串returns# 使用字符串切片和拼接来替换最后一个匹配项returns[:index]+new+s[index+len(old):]# 示例使用original_string="这是一个测试字符串,测试,...
defreplace_last_occurrence(address,old,new):index=address.rfind(old)ifindex==-1:returnaddress# 如果未找到,返回原始字符串returnaddress[:index]+new+address[index+len(old):]address="朝阳街、海淀街、丰台街"new_address=replace_last_occurrence(address,"街","路")print(new_address)# 输出: 朝阳街、...
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...
Decodes the string using the codec registered for encoding. encoding defaults to the default string encoding. errors may be given to set a different error handling scheme. The default is 'strict', meaning that encoding errors raise UnicodeError. Other possible values are 'ignore', 'replace' and...
To replace parts of a string with another string: s = "Hello world" new_s = s.replace("world", "Python") print(new_s) 9. String Methods — find, index To find the position of a substring within a string: s = "look for a substring" position = s.find("substring") # Returns ...
# Use the optional argument end to change the end string. print("Hello, World", end="!") # => Hello, World! 使用input时,Python会在命令行接收一行字符串作为输入。可以在input当中传入字符串,会被当成提示输出: # Simple way to get input data from console input_string_var = input("Enter so...
s = 'Hello world' t = s.replace('Hello' , 'Hallo') # 'Hallo world' 更多字符串方法:字符串具有各种各样的方法用于测试和处理文本数据。下面是字符串方法的一小部分示例:s.endswith(suffix) # Check if string ends with suffix s.find(t) # First occurrence of t in s s.index(t) # First ...
If any class was duplicated in this search, all but the last occurrence would be deleted from the MRO list. So, for our earlier example, the search order would be D, B, C, A (as opposed to D, B, A, C, A with classic classes)....
数据类型 一、数字(int) Python可以处理任意大小的正负整数,但是实际中跟我们计算机的内存有关,在32位机器上,整数的位数为32位,取值范围为 -2**31～2**31-1,在64位系统上,整数的位数为64位,取值范围为-2**63～2**63-1。对于int类型,需要掌握的方法不多,看下