如何向諸如username = password之類的函數輸入參數？

Question

我希望我的代碼像這樣，並在代碼中同時使用用戶名和密碼參數作為字符串。

def check_registration_rules(username='password'):

調用函數是這樣的：

check_registration_rules(parsap1378='pass')

Answer 1

更簡單，更清晰（更好的IMHO）解決方案是具有2個功能參數，其中1個用於用戶名，而1個用於密碼。

def check_registration_rules(username, password):
    print(type(username), username)  # <class 'str'> parsap1378
    print(type(password), password)  # <class 'str'> pass

check_registration_rules("parsap1378", "pass")

但是，如果您真的想像parsap1378='pass'一樣傳遞它，則可以使用關鍵字arguments ：

def check_registration_rules(**kwargs):
    username, password = kwargs.popitem()
    print(type(username), username)  # <class 'str'> parsap1378
    print(type(password), password)  # <class 'str'> pass

check_registration_rules(parsap1378='pass')

如果要將其他參數傳遞給函數，如果它們的格式不是key=val ，則需要在關鍵字參數之前傳遞它，如關鍵字arguments docs中所述：

def check_registration_rules(aaa, bbb, **kwargs):
    print(aaa, bbb)  # 111 222

    username, password = kwargs.popitem()
    print(type(username), username)  # <class 'str'> parsap1378
    print(type(password), password)  # <class 'str'> pass

check_registration_rules(111, 222, parsap1378='pass')

如果要傳遞多個username=password對，則需要像常規dict一樣遍歷kwargs ：

def check_registration_rules(**kwargs):
    for username, password in kwargs.items():
        print(type(username), username)
        print(type(password), password)

check_registration_rules(parsap1378='pass', aaa="123", bbb="456")
# <class 'str'> parsap1378
# <class 'str'> pass
# <class 'str'> aaa
# <class 'str'> 123
# <class 'str'> bbb
# <class 'str'> 45