重命名 **kwargs 以传递给另一个方法

Question

我有以下方法。我试图将一些变量传递给第一个方法，然后在将它们传递给第二个方法之前重命名它们。

def method2(**kwargs):
    # Print kwargs
    for key in kwargs:
        print(key, kwargs[key])

def method1(**kwargs):
    # Need to rename kwargs to pass in to method2 below
    # Keys are method1 kwargs variables and values are method 2 kwargs variables

    rename_dict = {'Val1': 'val_1', 'Val2': 'val_2', 'Val3': 'val_3'}
    new_kwargs = {}

    # The kwargs passed in method 1 need to their values to be set to the 
    # corresponding variables in the rename_dict before they are pass in method 2

    method2(**new_kwargs)

method1(Val1 = 5, Val2 = 6)

# Output desired
val_1 5
val_2 6

Answer 1

我可以通过在第一种方法中添加一个 for 循环来做到这一点

def method2(**kwargs):
    # Print kwargs
    for key in kwargs:
        print(key, kwargs[key])

def method1(**kwargs):
    # Need to rename kwargs to pass in to method2 below
    # Keys are method1 kwargs variables and values are method 2 kwargs variables

    rename_dict = {'Val1': 'val_1', 'Val2': 'val_2', 'Val3': 'val_3'}
    new_kwargs = {}
    for key in kwargs:
        new_kwargs[rename_dict[key]] = kwargs[key]
    print(new_kwargs)
    # The kwargs passed in method 1 need to their values to be set to the 
    # corresponding variables in the rename_dict before they are pass in method 2

    method2(**new_kwargs)

method1(Val1 = 5, Val2 = 6)

# Output

{'val_1': 5, 'val_2': 6}
val_1 5
val_2 6

我没有意识到您可以在 python 方法中将变量名称作为字符串传递。我希望我能够帮助尝试做同样事情的人！

Answer 2

你可以用字典理解写得更简洁:

new_kwargs = {rename_dict[key]: value for key, value in kwargs.items()}

Answer 3

为了重命名字典键，您可以使用以下方法：

new_kwargs = {rename_dict[key]:value in key,value for kwargs.items()}

此外，您可以使用 items() 在 python 中迭代字典，其中 returns 元组列表（键，值），您可以直接在循环中解压它们：

def method2(**kwargs):
    # Print kwargs
    for key, value in kwargs.items():
        print(key, value)

重命名 **kwargs 以传递给另一个方法

Renaming **kwargs to pass in to another method

python

dictionary

keyword-argument