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',
msg2 = msg.replace('fox', 'wolf', 1) print(msg2) The example replaces the first occurrence of the word 'fox'. $ ./replace_first.py There is a wolf in the forest. The fox has red fur. Python replace last occurrence of stringIn the next example, we replace the last occurrence ...
rfind()substitutionStartFindLastOccurrenceReplaceEnd 3.2 序列图 以下序列图展示了函数调用的过程以及这些步骤的顺序: FunctionUserFunctionUserreplace_last("banana", "a", "o")rfind("a")Perform Replacement"banano" 在图中,我们可以看到用户调用replace_last函数,然后函数通过查找最后一个匹配项并执行替换,最终返...
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...
The string '01234567'. 9) string.punctuation 标点符号 String of ASCII characters which are considered punctuation characters in the C locale. 10) string.printable 所有可打印的字符集,包含数字,字母,标点空白符 String of characters which are considered printable. This is a combination of digits, lette...
String indexing in Python is zero-based: the first character in the string has index 0, the next has index 1, and so on. The index of the last character will be the length of the string minus one. Python中的字符串索引是从零开始的:字符串中的第一个字符的索引为0 ,下一个字符的索引为...
Write a Python program to split a string on the last occurrence of the delimiter. Click me to see the sample solution 51. Find first non-repeating character. Write a Python program to find the first non-repeating character in a given string. ...
# Remove arbitrary elements from a list with "del" del li[2] # li is now [1, 2, 3] # Remove first occurrence of a value li.remove(2) # li is now [1, 3] li.remove(2) # Raises a ValueError as 2 is not in the list insert方法可以指定位置插入元素,index方法可以查询某个元素...
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 occurrence of t in s s...
upper() Converts the string to uppercase lower() Converts the string to lowercase partition() Returns a tuple replace() Replaces substring inside find() Returns the index of the first occurrence of substring rstrip() Removes trailing characters split() Splits string from left startswith() Che...