I'm new to py and ran into an unexpected behavior :
tracker = Dict[int, List[int]]
tracker.update({1: {1,2,3}})
tracker.update({2: {4,5,6}})
tracker.update({3: {7,8,9}})
for key in tracker:
print(key)
stdout:
*typing.Dict[int, typing.List[int]]
I was expecting this output :
1
2
3
Can someone explain this behavior, and also describe how to iterate and print the dict keys ?
You've assigned the Type Definition to tracker, not an actual instance of a dictionary.
Also {1,2,3} is a set, not a list.
tracker: Dict[int, List[int]] = dict()
tracker.update({1: [1,2,3]})
tracker.update({2: [4,5,6]})
tracker.update({3: [7,8,9]})
for key in tracker.keys():
print(key)
Or...
tracker: Dict[int, List[int]] = dict()
tracker[1] = [1,2,3]
tracker[2] = [4,5,6]
tracker[3] = [7,8,9]
for key in tracker.keys():
print(key)
Or...
tracker: Dict[int, List[int]] = {
1: [1,2,3],
2: [4,5,6],
3: [7,8,9],
}
for key in tracker.keys():
print(key)
