Python 3.X 程式語言特訓教材 8-21頁
a. 至少8字元
b. 只包含英數字
c. 至少要有一個大寫英文字母
pw=input()
validpw = True
if len(pw) <=7 \
or pw.isalpha()\
or pw.isdigit()\
or pw.islower():\
validpw = False
else:
for i in range(0,len(pw)):
if not pw[i].isalpha()\
and not pw[i].isdigit():\
validpw = False
break
#密碼由英數字組成
if validpw:
print(“Valid password”)
else:
print(“Invalid password”)

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