KnowCardPython · Basic Types & None
What is the type of None, and how many instances of it exist at runtime?
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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 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?
What does this print, and why does `+` behave differently on each line?
```
print(1 + 2)
print("1" + "2")
```
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