Python dictionary doesn't have all the keys assigned, or items

Question

I created the following dictionary

exDict = {True: 0, False: 1, 1: \'a\', 2: \'b\'}

and when I print exDict.keys(), well, it g

Answer 1

What you are seeing is python coercing the 1 to be equal to the True.

You'll see that the dictionary you print is:

False  1
True   a
2      b

Where the value a was meant to be assigned to the 1, but instead the value for True got reassigned to a.

According to the Python 3 Documentation:

The Boolean type is a subtype of the integer type, and Boolean values behave like the values 0 and 1, respectively, in almost all contexts, the exception being that when converted to a string, the strings "False" or "True" are returned, respectively.

Emphasis mine.

Note: In python 2.X True and False can be re-assigned, so this behavior cannot be guaranteed.