exercise3.md

Exercise 3 ( More on data types and comments)

There are other data types other than those mentioned earlier in Exercise 2 (Data Types). We shall discuss the boolean data type.

This data type can only be True or False. Boolean values are generated when values are compared or when there is a condition. Eg 1 < 2 is True, 1 > 2 is False .

Examples

is_online = True
is_swift = True
is_human = False

Note

Boolean values are case sensitive. Upper-case T for True and F for False , in python.

Comment

A comment is a piece of text that mostly should tell why or what we are trying to achieve. The # symbol, placed ( inserted) at the beginning of the line, comments the line ( the line is ignored by the interpreter).

Examples

# Hello world program
# Display Hello world for the user to see
# Using the print function
print("Hello world")

The first three lines starting with # are comments. A comment is ignored during execution. You can also comment out some lines during debugging.

Note

Whatever that comes after the # would be ignored. print('hello world') # greetings , greetings would be ignored.

Practicals

1. In Exercise 2 (Data Types), add comments to your solutions to give the why/what the line is doing or meant to do ( remember that not all lines need a comment if the code is descriptive itself).

2. • How many comments are there in the code below?
   • Which line numbers, would be displayed and why?

   1 # John Doe - profile
   2 print("My name is John Doe") # yes that's my name
   3 print("He washes my hair")
   4 # i like to dance in the rain print("This costs $25.00")
   5 my_name = "Danny Doe Dan"
   6
   7

Summary

• A boolean value is True or False.
• These values are generated during the comparison of two or more values.
• A comment is supposed to explain, "the" what or why in the code ( line)
• We can also use it to state how we want to reach our solution
• Use # to create a comment