請寫一個python邏輯，計算一個文件中的大寫字母數量

 

 

import os
os.chdir(r'C:\Users\Administrator\Desktop')#os.chdir切換到指定目錄
with open('a.txt') as today:
    count=0
    for i in today.read():
        if i.isupper():
            count+=1
print(count)

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