Python 程序查找字符串中的字符的最后一次出现

编写一个 Python 程序，通过一个实际例子来查找字符串中的字符的最后一次出现。这个 Python 程序允许用户输入字符串和字符。

# Python Program to find Last Occurrence of a Character in a String
string = input("Please enter your own String : ")
char = input("Please enter your own Character : ")
flag = -1
for i in range(len(string)):
    if(string[i] == char):
        flag = i
if(flag == -1):
    print("Sorry! We haven't found the Search Character in this string ")
else:
    print("The Last Occurrence of ", char, " is Found at Position " , flag + 1)

首先，我们使用 For Loop 来迭代一个字符串中的每个字符。其中，我们使用 If 语句来检查 str1 字符串中的任何字符是否等于给定的字符。如果为真，则 flag = i。 接下来，我们使用 If Else 语句检查标志值是否等于 -1 或不等于 0。 string = hello world ch = l flag = -1

• 第一次迭代：对于范围(11)中的 i，如果字符串[i] == char，即 h == l，条件为假。
• 第二次迭代：如果 e == l，条件为假，i 为 1。
• 第三次迭代：对于 i = 2，如果 str[2] == ch，即 l == l，条件为真。标志 = 2。 对剩余的迭代做同样的事情。这里，条件（标志 == -1）为假。所以，在执行的 else 块内打印。

Python 程序查找字符串中的字符的最后一次出现示例 2

这个 Python 上一次出现的一个人物程序和上面一样。然而，我们只是将 For 循环替换为 While 循环。

# Python Program to find Last Occurrence of a Character in a String
string = input("Please enter your own String : ")
char = input("Please enter your own Character : ")
i = 0
flag = -1
while(i < len(string)):
    if(string[i] == char):
        flag = i
    i = i + 1
if(flag == -1):
    print("Sorry! We haven't found the Search Character in this string ")
else:
    print("The Last Occurrence of ", char, " is Found at Position " , flag + 1)

Python 字符串输出中的字符的最后一次出现：

Please enter your own String : tutorialgateway
Please enter your own Character : t
The Last Occurrence of  t  is Found at Position  11

Python 程序查找字符串中的最后一次出现示例 3

字符串中的字符的最后一次 Python 出现与第一个示例相同。但是，这一次，我们使用了函数的概念来分离 Python 程序的逻辑。

# Python Program to find Last Occurrence of a Character in a String
def last_Occurrence(char, string):
    index = -1
    for i in range(len(string)):
        if(string[i] == char):
            index = i
    return index
str1 = input("Please enter your own String : ")
ch = input("Please enter your own Character : ")
flag = last_Occurrence(ch, str1)
if(flag == -1):
    print("Sorry! We haven't found the Search Character in this string ")
else:
    print("The Last Occurrence of ", ch, " is Found at Position " , flag + 1)

Python 字符串输出中的字符的最后一次出现：

Please enter your own String : hello
Please enter your own Character : m
Sorry! We haven't found the Search Character in this string 
>>> 
Please enter your own String : python programs
Please enter your own Character : p
The Last Occurrence of  p  is Found at Position  8
>>>