Basic Data Types, Strings and Numbers


List the type of the following variables using the type() function.

>>> x = 42
>>> y = 3 / 4
>>> z = int('7')
>>> a = float(5)
>>> name = "Nina"


Calculate the amount of rent you pay daily, by taking your monthly rent and diving it by 30.

>>> rent = 480
>>> per_day = rent / 30
>>> print(per_day)


Try printing some things to your REPL:

>>> print("Hello world")
Hello world
>>> name = "Nina"
>>> print("My name is", name)
My name is Nina

There are three different ways to format strings in Python3. You may run into %-formatting and str.format() in older code. These are still common in Python but no longer recommended, due to readability concerns.

>>> name = "Nina"
>>> print("Hello, my name is %s" % name)
Hello, my name is Nina

The current recommended way to format string is with f-Strings. f-Strings are much more readable and easier to maintain than the previous methods. With f-Strings, your string is prepended with the letter f and your variables or expressions to interpret are placed in {brackets}.

>>> name = "Nina"
>>> print(f"Hello, my name is {name} and I pay ${rent / 30} in rent per day")
Hello, my name is Nina and I pay $16.0 in rent per day

Helper Functions

Python has a few built-in functions to help you if you get stuck. type() tells you what an object’s type is, for example a string (str) or integer (int). dir() returns a list of valid attributes for an object, so you can quickly see what variables an object has or what functions you can call on it. help() brings up helpful documentation on any object. You can also type help() on its own to bring an interactive help console.

>>> x = 42
>>> y = 3 / 4
>>> name = "Nina"
>>> type(x)
<class 'int'>
>>> type(y)
<class 'float'>
>>> type(name)
<class 'str'>