How to create a function for recursively generating iterating functions

问题

I currently have a bit of Python code that looks like this:

for set_k in data:
    for tup_j in set_k:
        for tup_l in tup_j:

The problem is, I'd like the number of nested for statements to differ based on user input. If I wanted to create a function which generated n number of for statements like those above, how might I go about doing that?

回答1:

def nfor(data, n=1):
    if n == 1:
        yield from iter(data)
    else:
        for element in data:
            yield from nfor(element, n=n-1)

Demo:

>>> for i in nfor(['ab', 'c'], n=1):
...     print(i)
...     
ab
c
>>> for i in nfor(['ab', 'c'], n=2):
...     print(i)
...     
a
b
c

来源：https://stackoverflow.com/questions/49059681/how-to-create-a-function-for-recursively-generating-iterating-functions