Traceback (most recent call last):
  File "/Users/shantanu/dev/cpython/z.py", line 8, in <module>
    x.update([foo() for _ in range(3)])
    ~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/shantanu/dev/cpython/z.py", line 4, in foo
    yield random.randint(100)  # oops, only passed in one argument
          ~~~~~~~~~~~~~~^^^^^
TypeError: Random.randint() missing 1 required positional argument: 'b'
Cannot convert dictionary update sequence element #0 to a sequence

Traceback (most recent call last):
  File "/Users/shantanu/dev/cpython/z.py", line 7, in <module>
    dict([foo() for _ in range(3)])
TypeError: cannot convert dictionary update sequence element #0 to a sequence