在变量名之后自动命名关键字参数

Question

我经常发现自己这样做:

myvariable = 'whatever'
another = 'something else'
print '{myvariable} {another}'.format(
    myvariable=myvariable,
    another=another
)

是否有一种方法可以避免以这种重复的方式命名关键字参数?我在想这样的事情:

format_vars = [myvariable, another]
print '{myvariable} {another}'.format(format_vars)

Answer 1

可以使用locals():

print '{myvariable} {another}'.format(**locals())

也可以(至少在Cpython中)自动从作用域中选择格式变量，例如:

def f(s, *args, **kwargs):
    frame = sys._getframe(1)
    d = {}
    d.update(frame.f_globals)
    d.update(frame.f_locals)    
    d.update(kwargs)
    return Formatter().vformat(s, args, d)    

用法:

myvariable = 'whatever'
another = 'something else'
print f('{myvariable} {another}')

参见从其调用范围中提取变量的字符串格式化程序是坏做法吗?有关此技术的详细信息。

Answer 2

当然:

>>> format_vars = {"myvariable": "whatever",
...                "another": "something else"}
>>> print('{myvariable} {another}'.format(**format_vars))
whatever something else