我的程序是為了分配一個(gè)密碼庫，所以用戶創(chuàng)建一個(gè)帳戶并輸入密碼庫，然后他添加應(yīng)用程序和密碼并查看它，問題是它也必須打印摘要但是當(dāng)用戶沒有輸入的應(yīng)用程序和密碼它不告訴他們他們沒有任何。摘要代碼>>def app_summary(): while True: if len(vault_apps) < 1: print('''there is no summary of your acount as, you currently have 0 apps and passwords stored on your account''') else: print('''You have {} app and its information stored'''.format(len(vault_apps))) print('''Your longest password is charecters''', max(len(a) for a in vault_apps)) print('''Your shortest password is charecters''', min(len(a) for a in vault_apps)) goback_menu() break 正如您所看到的，如果存儲(chǔ)了 < 一個(gè)應(yīng)用程序，它應(yīng)該打印出來，('''there is no summary of your acount as, you currently have 0 apps and passwords stored on your account''')但我收到了這個(gè)錯(cuò)誤： max(len(a) for a in vault_apps))builtins.ValueError: max() arg is an empty sequence
2 回答
慕慕森
TA貢獻(xiàn)1856條經(jīng)驗(yàn) 獲得超17個(gè)贊
else:塊的縮進(jìn)不對(duì)，應(yīng)該是：
else:
print('''You have {} app and its information stored'''.format(len(vault_apps)))
print('''Your longest password is charecters''', max(len(a) for a in vault_apps))
print('''Your shortest password is charecters''', min(len(a) for a in vault_apps))
作為一般規(guī)則，您可以避免將else:塊放在同一行上，這樣可以避免在之后向它們添加行時(shí)出現(xiàn)此類問題。
隔江千里
TA貢獻(xiàn)1906條經(jīng)驗(yàn) 獲得超10個(gè)贊
你的縮進(jìn)是錯(cuò)誤的。你所有的print調(diào)用都應(yīng)該在else塊中。此外，請(qǐng)考慮使用f-strings并將長(zhǎng)度的生成器表達(dá)式分解為單獨(dú)的list：
if not vault_apps:
print('There is no summary of your account as you have no apps and passwords stored.')
else:
lengths = [len(a) for a in vault_apps]
print(f'You have {n_apps} apps and their information stored.')
print(f'Your longest password is {max(lengths)} characters.')
print(f'Your shortest password is {min(lengths)} characters.')
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