Python 程序：尋找字符串中的字符的最後一次出現

編寫一個 Python 程序，通過一個實際例子來查找字符串中的字符的最後一次出現。這個 python 程序允許用戶輸入字符串和字符。

# 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，我們使用 For Loop 來迭代一個字符串中的每個字符。其中，我們使用 If 語句來檢查 str1 字符串中的任何字符是否等於給定的字符。如果為真，則標誌= i.

接下來，我們使用 If Else 語句檢查標誌值是否等於-1 或不等於 0。

string = hello world
ch = l
flag =-1

對於循環第一次迭代:對於範圍(11)中的 I，如果(字符串[i] == char)
如果(h = = l)–條件為假。

第二次迭代:如果(e = = l)–條件為假，範圍(11)
中的 1。

第三次迭代:對於範圍(11)中的 2，如果(str[2] == ch) = >如果(l = = l)–條件為真。
標誌= 2

對剩餘的迭代做同樣的事情。這裡，條件(標誌== -1)為假。所以，在執行的 else 塊內打印。

Python 程序查找字符串中的字符的最後一次出現示例 2

這個 Python 上一次出現的一個人物程序和上面一樣。然而，我們只是將 For 循環替換為 While 循環。

# 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 字符串輸出中的字符的最後一次出現

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後一次出現示例 3

字符串中的字符的最後一次 Python 出現與第一個示例相同。但是，這一次，我們使用了函數的概念來分離 python 程序的邏輯。

# 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 字符串輸出中的字符的最後一次出現

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
>>>