Python程序查找给定字符串中每个字符的出现

给定一个字符串，任务是用Python编写一个程序，打印字符串中每个字符出现的次数。

Python中有多种方法，我们可以完成这项任务。让我们讨论其中的几个。

方法 #1：使用set() + count()

遍历设置的转换字符串并获取原始字符串中每个字符的计数。

# Python3 code to program to find occurrence
# to each character in given string
  
# initializing string 
inp_str = "GeeksforGeeks"
  
# using set() + count() to get count 
# of each element in string 
out = {x : inp_str.count(x) for x in set(inp_str )} 
  
# printing result 
print ("Occurrence of all characters in GeeksforGeeks is :\n "+ str(out)) 

输出：

Occurrence of all characters in GeeksforGeeks is :
 {'o': 1, 'r': 1, 'e': 4, 's': 2, 'f': 1, 'G': 2, 'k': 2}

方法#2：使用字典

# Python3 code to program to find occurrence
# to each character in given string
  
# initializing string 
inp_str = "GeeksforGeeks"
  
# frequency dictionary
freq = {} 
    
for ele in inp_str: 
    if ele in freq: 
        freq[ele] += 1
    else: 
        freq[ele] = 1
    
# printing result  
print ("Occurrence of all characters in GeeksforGeeks is :\n "+ str(freq)) 

输出：

Occurrence of all characters in GeeksforGeeks is :
 {'e': 4, 'r': 1, 'o': 1, 'f': 1, 'G': 2, 's': 2, 'k': 2}

方法#3：使用collections

# Python3 code to program to find occurrence
# to each character in given string
from collections import Counter 
    
# initializing string  
in_str = "GeeksforGeeks"
    
# using collections.Counter() to get  
# count of each element in string  
oup = Counter(in_str) 
    
# printing result  
print ("Occurrence of all characters in GeeksforGeeks is :\n "+ str(oup)) 

输出：

Occurrence of all characters in GeeksforGeeks is :
 Counter({'e': 4, 's': 2, 'G': 2, 'k': 2, 'f': 1, 'r': 1, 'o': 1})