Python Scoping In Dict Comprehension

>>> x = 'foo' >>> {0: locals().get('x')} {0: 'foo'} >>> {0: locals().get('x' + spam) for spam in ['']} {0: None} What is the reason for this discrepancy

Solution 1:

Dict comprehensions and generator comprehensions create their own local scope. List comprehensions do not in Python 2.x, but do in Python 3. (Note that your first example is not a dict comprehension. It's just a literal dict that happens to have an expression as the value for the key 0.)