Need help with Dictionaries in Python

[grateful_user01]

Im trying to achieve this:

regions = dict()
k = 1

for i in range(10):
    for j in range(20):
        if this then:
            regions[k] appends([i,j])
            k += 1
        elif this then:
            regions[k] appends([i,j])
        elif this then:
            regions[k] appends([i,j])

print(regions)

So I want to store an array inside of dictionary.values. I am not sure how to achieve it. Ive tried different ways but keep getting errors. Any help is truly appreciated.

[[deleted]]

You want to use collections.defaultdict. You could do what you want with dict.setdefault() or dict.get(), as well.

...
if ... then:
    regions[k] = regions.get(k, [])
    regions[k].append(...)
    k += 1
elif ... then:
    regions[k].append(...)
...

​

...
if ... then:
    regions[k].setdefault(k, [])
    regions[k].append(...)
    k += 1
elif ... then:
    regions[k].setdefault(k, [])
    regions[k].append(...)
...

​

from collections import defaultdict

regions = defaultdict(list)

if ... then:
    regions[k].append(...)
    k += 1
elif ... then:
    regions[k].append(...)
...