python遍历变量

Question

Is there a python built-in for iterating over some variables? Something like:

def iterate_args(*args):
    for arg in args:
        yield arg

It would be useful for instance in the following case:

x, y, z = ...
for var in iterate_args(x,y,z):
    do_something(var)

Instead of allocating a list, which looks wasteful (is it?):

x, y, z = ...
for var in [x,y,z]:
    do_something(var)

Haven't been able to find anything among python built-ins .

Answer 1

Any such built-in would be much more expensive than creating a tuple, and would in fact involve creating a tuple for args . Just make a tuple.

In the specific case where x , y , and z are initialized like your example:

x, y, z = ...

you can just iterate over whatever you unpacked instead of unpacking it.