Python

Variables

Variables in Python can hold text and numbers. For example:

x = 2
price = 2.5
word = 'Hello'

The variable names are on the left and the values on the right. Once a variable is assigned, it can be used in other places of the program.

Related Course: Complete Python Bootcamp: Go from zero to hero in Python

In the example above, we have three variables: _x_, price and word.

Note: Variables may not contain spaces or special characters.

Text in variables

Text variables may be defined in 3 ways:

word = 'Hello'
word = "Hello"
word = '''Hello'''

The type depends on what you prefer.

Operators

Once defined variables can be replaced or modified:

  x = 2

# increase x by one
x = x + 1

# replace x
x = 5

Python supports the operators +, -, / and * as well as brackets. Variables may be shown on the screen using the print statement.

  
x = 5
print(x)

y = 3 * x
print(y)

# more detailed output
print("x = " + str(x))
print("y = " + str(y))


The first output of the program above is simply the raw value of the variables. If you want to print a more detailed message like “x = 5”, use the line ‘print(“x = “ + str(x))’. This str() function converts the numeric variable to text.
 

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