Programming Fundamentals/Variable Examples Python

Overview

The following examples demonstrate data types, arithmetic operations, and input in Python.

Data Types

 # This program demonstrates variables, literal constants, and data types.
 
 i = 1234567890
 f = 1.23456789012345
 s = "string"
 b = True
 
 print("Integer i =", i)
 print("Float f =", f)
 print("String s =", s)
 print("Boolean b =", b)

Output

Integer i = 1234567890
Float f = 1.23456789012345
String s = string
Boolean b = true

Discussion

Each code element represents:

• # begins a comment
• i = , d = , s =, b = assign literal values to the corresponding variables
• print() calls the print function

Arithmetic

 # This program demonstrates arithmetic operations.
 
 a = 3
 b = 2
 
 print("a =", a)
 print("b =", b)
 print("a + b =", (a + b))
 print("a - b =", (a - b))
 print("a * b =", a * b)
 print("a / b =", a / b)
 print("a % b =", (a % b))

Output

a = 3
b = 2
a + b = 5
a - b = 1
a * b = 6
a / b = 1.5
a % b = 1

Discussion

Each new code element represents:

• +, -, *, /, and % represent addition, subtraction, multiplication, division, and modulus, respectively.

Temperature

 # This program converts an input Fahrenheit temperature to Celsius.
 
 print("Enter Fahrenheit temperature:")
 fahrenheit = float(input())
 
 celsius = (fahrenheit - 32) * 5 / 9
 
 print(str(fahrenheit) + "° Fahrenheit is " + str(celsius) + "° Celsius")

Output

Enter Fahrenheit temperature:
 100
100.0° Fahrenheit is 37.77777777777778° Celsius

Discussion

Each new code element represents:

• input() reads the next line from standard input
• float() converts the input to a floating-point value

References

• Wikiversity: Computer Programming

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