Question 1: Lambda the Free

Use Ok to test your knowledge with the following "What Would Python Display?" questions:

$ python ok -q lambda -u

As a reminder, the following two lines of code will not display anything in the Python interpreter when executed:

>>> x = None
>>> x

>>> lambda x: x  # A lambda expression with one parameter x
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>>> a = lambda x: x  # Assigning the lambda function to the name a
>>> a(5)
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>>> (lambda: 3)()  # Using a lambda expression as an operator in a call exp.
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>>> b = lambda x: lambda: x  # Lambdas can return other lambdas!
>>> c = b(88)
>>> c
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>>> c()
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>>> d = lambda f: f(4)  # They can have functions as arguments as well.
>>> def square(x):
...     return x * x
>>> d(square)
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>>> x = None # remember to review the rules of WWPD given above!
>>> x
>>> lambda x: x
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>>> z = 3
>>> e = lambda x: lambda y: lambda: x + y + z
>>> e(0)(1)()
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>>> f = lambda z: x + z
>>> f(3)
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>>> higher_order_lambda = lambda f: lambda x: f(x)
>>> g = lambda x: x * x
>>> higher_order_lambda(2)(g)  # Which argument belongs to which function call?
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>>> higher_order_lambda(g)(2)
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>>> call_thrice = lambda f: lambda x: f(f(f(x)))
>>> call_thrice(lambda y: y + 1)(0)
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>>> print_lambda = lambda z: print(z)  # When is the return expression of a lambda expression executed?
>>> print_lambda
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>>> one_thousand = print_lambda(1000)
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>>> one_thousand
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