count str - weqopy site

Question
Solution

Question

给定文件，统计其中包含的各字母个数，输出其中数量最多的 5 个字母及其个数。

注：不能使用内嵌模块或方法

Solution

import string

low = string.ascii_lowercase
up = string.ascii_uppercase
temp, res = {}, {}

# get every string
with open("count_sr.txt", "r") as f:
    contents = f.read()
    for item in contents:
        count = temp.get(item, 0)
        temp[item] = count + 1

# get lowercase dict
for i in range(26):
    res[low[i]] = temp.get(low[i], 0) + temp.get(up[i], 0)
keys = list(res.keys())

# insert sort keys
for j in range(1, 26):
    for k in range(j, 0, -1):
        if res[keys[k - 1]] < res[keys[k]]:
            keys[k - 1], keys[k] = keys[k], keys[k - 1]
        else:
            break

for _ in range(5):
    print(keys[_], res[keys[_]])

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