Python Tutorials · Python Variables

Python Variables

Learn all about Python Variables in this comprehensive tutorial.

5 min read beginner

•Variables are containers for storing data values.
•Python has no command for declaring a variable.
•If you want to specify the data type of a variable, this can be done with casting.
•You can get the data type of a variable with the type() function.
•String variables can be declared either by using single or double quotes:
•Variable names are case-sensitive.

Variables

Variables are containers for storing data values.

Python has no command for declaring a variable.

A variable is created the moment you first assign a value to it.

python

val_1 = 5
val_2 = "Alice"
print(val_1)
print(val_2)

Variables do not need to be declared with any particular type, and can even change type after they have been set.

python

val_1 = 4       # val_1 is of type int
val_1 = "Sally" # val_1 is now of type str
print(val_1)

If you want to specify the data type of a variable, this can be done with casting.

python

val_1 = 
  str(3)    # val_1 will be '3'val_2 = int(3)    # val_2 
  will be 3z = float(3)  # z will be 3.0

You can get the data type of a variable with the type() function.

python

val_1 = 5y = "Alice"print(type(val_1))print(type(val_2))

Note: You will learn more about data types and casting later in this tutorial.

String variables can be declared either by using single or double quotes:

python

val_1 = "Alice"# is the same asx = 
  'John'

Variable names are case-sensitive.

python

a = 4A = 
  "Sally"#A will not overwrite a

2 questions

Which of the following is true about Python Variables?

It is strictly typedIt is evaluated at runtimeIt requires explicit memory managementIt is deprecated

What is the most common pitfall when working with Python Variables?

SyntaxErrorIndentationErrorNameErrorTypeError

Answer all questions to submit.