Python Tutorial - Python Full Course
Variables and Data Types
We'll start by talking about variables. In programming, a variable is a
named location used to store data in memory. It is called a variable
because its value can vary throughout the execution of a program.
Variables must be given unique names, called identifiers. In Python,
variable names are case sensitive and cannot start with a number. They can
contain letters, numbers, and underscores.
For example, let's say we want to store the number of apples I have in a
variable named apples. We can do this with the following code:
apples = 5
Now, apples is a variable that stores the value 5. We can use this variable
in calculations, such as adding more apples:
apples = apples + 3
print(apples)
This will output 8, because we added 3 to the value stored in
the apples variable.
Next, let's talk about data types. A data type is an attribute that tells what
kind of data a particular variable can hold. There are several basic data
types in Python, including int, float, str, and bool.
int is short for integer, which is a whole number, positive or negative,
without decimals. For example:
num_apples = 10
num_oranges = -5
float is short for floating point number, which is a number with decimals.
For example:
price_per_apple = 0.5
price_per_orange = 0.35
Variables and Data Types
We'll start by talking about variables. In programming, a variable is a
named location used to store data in memory. It is called a variable
because its value can vary throughout the execution of a program.
Variables must be given unique names, called identifiers. In Python,
variable names are case sensitive and cannot start with a number. They can
contain letters, numbers, and underscores.
For example, let's say we want to store the number of apples I have in a
variable named apples. We can do this with the following code:
apples = 5
Now, apples is a variable that stores the value 5. We can use this variable
in calculations, such as adding more apples:
apples = apples + 3
print(apples)
This will output 8, because we added 3 to the value stored in
the apples variable.
Next, let's talk about data types. A data type is an attribute that tells what
kind of data a particular variable can hold. There are several basic data
types in Python, including int, float, str, and bool.
int is short for integer, which is a whole number, positive or negative,
without decimals. For example:
num_apples = 10
num_oranges = -5
float is short for floating point number, which is a number with decimals.
For example:
price_per_apple = 0.5
price_per_orange = 0.35
