Python · Basic Types & None

A user is prompted for their age. What does this print, or does it fail? age = input("Age: ") # user types 30 print(age + 1)

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More in Basic Types & None

You want to check whether a result is the "no value" sentinel. Why prefer if x is None: over if x == None:?

What is the type of None, and how many instances of it exist at runtime?

What does this print? ``` def greet(name): print("hi", name) result = greet("Sam") print(result) ```

What does this print? ``` nums = [3, 1, 2] result = nums.sort() print(result) ```

Is `None` truthy or falsy, and what does this print? ``` x = None if x: print("yes") else: print("no") ```

In Python, every value is an object with a type. What is the idea behind type(x), and what does type(5) return?

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