Getting Started with Python Programming

The articles on python will be succinct. It is up to you to delve deeper. This post talks about the very fundamental concepts. There is a summary slide, followed by a program and its output.

Program

__author__ = 'techmightsolutions.blogspot.com'


def integer_representations():
    print("Decimal 10 = ", 10)
    print("Binary  10 = ", 0b10)
    print("Octal  10 = ", 0o10)
    print("Hexadecimal 10 = ", 0x10)

    # Constructing int using int() constructor
    print("Converting to int from other numeric type = ", int(5.49))

    #Rounding will always be towards zero
    print("int(-5.49) = ", int(-5.49))

    #Converting to base 10, from base 2
    print("0b100 = ", int("100", 2))


def floating_point_numbers():
    """IEEE-754 double precision (64-bit)
    53 bits of binary precision
    15 to 16 bits of decimal precision
    """
    print("Speed of Light = ", 3e8)
    print("Plank's constant = ", 1.616e-35)

    # using float constructor for conversion
    print(float("56"))

    #nan, inf and -inf
    print(float("nan"))
    print(float("inf"))
    print(float("-inf"))


def None_value():
    """Special null value = None
    :return:
    """

    # checking if a variable is None using is operator
    a = None
    print(a is None)


def bool_types():
    """
    represents logical state
    either True or False
    :return:
    """

    # bool constructor for conversion
    print(" 0 = ", bool(0))
    print(" 1.23 = ", bool(1.23))
    print("Empty String = ", bool(""))
    print("'techmightsolutions.blogspot.com' = ", bool(['techmightsolutions.blogspot.com']))
    print("Empty List [] = ", bool([]))
    print("List [1, 'Hello', 3] = ", bool([1, 'Hello', 3]))
    #same is applicable for tuple() and dictionary {}


def main():
    while True:
        print("-" * 20)
        print("What you want to test? ")
        print("1. Integer")
        print("2. Floats")
        print("3. None values")
        print("4. Boolean types")
        response = int(input("Enter your choice: "));

        if (response == 1):
            print("Integer Section: ")
            print("-" * 10)
            integer_representations()
        elif (response == 2):
            print("Floating point Section: ")
            print("-" * 10)
            floating_point_numbers()
        elif (response == 3):
            print("None value Section: ")
            print("-" * 10)
            None_value()
        elif (response == 4):
            print("bool Section: ")
            print("-" * 10)
            bool_types()
        else:
            break;


if __name__ == '__main__':
    main()

Output

--------------------
What you want to test? 
1. Integer
2. Floats
3. None values
4. Boolean types
Enter your choice: 1
Integer Section: 
----------
Decimal 10 =  10
Binary  10 =  2
Octal  10 =  8
Hexadecimal 10 =  16
Converting to int from other numeric type =  5
int(-5.49) =  -5
0b100 =  4
--------------------
What you want to test? 
1. Integer
2. Floats
3. None values
4. Boolean types
Enter your choice: 6

Process finished with exit code 0