FAQ: Learn Python: Syntax - Numbers


#1

This community-built FAQ covers the “Numbers” exercise from the lesson “Learn Python: Syntax”.

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This exercise can be found in the following Codecademy content:

Computer Science
Data Science

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#2

when im using release_year variable why am i not putting paranthesis around the year


#3

Because you want to define release year


#4

How come you don’t add “_int” or “_float” to define whether it’s a float or an integer?


#5

Python is not type cast, but type assigned. A variable gets its type from the value assigned to it. We do not have to declare the type.

pi = 3.1416

It will be a float by assignment.

int_pi = int(pi)

will parse the integer out of the value.

str_pi = str(pi)

will cast the value to a string.

Nothing prevents us from changing the values in any of the above to another type. We can change from one type to another and simply re-use variables, but we cannot perform operations on unmatched types.

1 + "1"

will throw an error.

We can even help garbage collection by releasing objects when they are no longer needed.

my_huge_array = None

The array will vanish, assuming there are no other references still in play.