信柜台二

Question

几天前，我制作了一个程序，允许我从字符串中选择一个字母，它会告诉我所选字母出现的次数。现在我想使用该代码创建一个程序，该程序接收所有字母并计算每个字母出现的次数。例如，如果我把“dog”作为我的字符串，我希望程序说d出现一次，o出现一次，g出现一次。这是我目前的代码。

from collections import Counter
import string
pickedletter= ()
count = 0
word = ()


def count_letters(word):
    global count
    wordsList = word.split()
    for words in wordsList:
        if words == pickedletter:
            count = count+1
    return count

word = input("what do you want to type? ")
pickedletter = input("what letter do you want to pick? ")
print (word.count(pickedletter))

Answer 1

from collections import Counter

def count_letters(word):
    counts = Counter(word)
    for char in sorted(counts):
        print char, "appears", counts[char], "times in", word

Answer 2

我不确定为什么要为此导入任何内容，尤其是Counter。这是我将使用的方法：

def count_letters(s):
    """Count the number of times each letter appears in the provided
    specified string.

    """

    results = {}  # Results dictionary.
    for x in s:
        if x.isalpha():
            try:
                results[x.lower()] += 1  # Case insensitive.
            except KeyError:
                results[x.lower()] = 1
    return results

if __name__ == '__main__':
    s = 'The quick brown fox jumps over the lazy dog and the cow jumps over the moon.'
    results = count_letters(s)
    print(results)