Python 程序计算字符串中字符的出现次数

编写一个 Python 程序，通过实际示例计算字符串中字符的出现次数。此 Python 程序允许您输入一个字符串和一个字符。

string = input("Please enter your own String : ")
char = input("Please enter your own Character : ")

count = 0
for i in range(len(string)):
    if(string[i] == char):
        count = count + 1

print("The total Number of Times ", char, " has Occurred = " , count)

在这里，我们使用 For 循环 遍历字符串中的每个字符。在 Python For 循环中，我们使用 If 语句 来检查字符串中的任何字符是否等于给定字符。如果为真，则 count = count + 1。

string = tutorial gateway
ch = t
count = 0

For Loop 第一次迭代：for i in range(11)
if(string[i] == char)
if(t == t) – 条件为真。
count = 0 + 1 => 1

第二次迭代：for 1 in range(11)
if(u == l) – 条件为假。

第三次迭代：for 2 in range(11)
if(string[2] == char) => if(t == t) – 条件为真。
count = 1 + 1 => 2

对剩余的 程序 迭代执行相同操作

使用 While 计算字符串中字符出现次数的 Python 程序

此字符串中字符的总出现次数计数与上面相同。但是，我们将 For 循环替换为了 While 循环。

string = input("Please enter your own String : ")
char = input("Please enter your own Character : ")
i = 0
count = 0

while(i < len(string)):
    if(string[i] == char):
        count = count + 1
    i = i + 1

print("The total Number of Times ", char, " has Occurred = " , count)

字符串中字符的总出现次数输出。

Please enter your own String : python programs
Please enter your own Character : p
The total Number of Times  p  has Occurred =  2
>>> 
Please enter your own String : hello
Please enter your own Character : l
The total Number of Times  l  has Occurred =  2

示例 3：计算字符总出现次数的程序

此给定字符的总出现次数程序与第一个示例相同。但是，这一次，我们使用了 函数 概念来分离逻辑。

def count_Occurrence(ch, str1):
    count = 0
    for i in range(len(string)):
        if(string[i] == char):
            count = count + 1
    return count

string = input("Please enter your own String : ")
char = input("Please enter your own Character : ")

cnt = count_Occurrence(char, string)
print("The total Number of Times ", char, " has Occurred = " , cnt)

字符串中字符总出现次数的输出

Please enter your own String : Python tutorial
Please enter your own Character : t
The total Number of Times  t  has Occurred =  3
>>> 
Please enter your own String : hi
Please enter your own Character : g
The total Number of Times  g  has Occurred =  0