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INF1511NOTES
,INF 1511 – Revision notes – Chapter 1
1. Introduction
Python is a powerful high-level, dynamic object-oriented programming that is implemented
in C, and relies on the extensive portable C libraries.
Python is an interpreted programming language, which means that it can be executed by the
computer without compiling. Compiling is the conversion of a programing language into
machine instructions that can then be executed by the computer.
C is a general-purpose, computer programming language, supporting structured
programming.
The implementation of Python studied in the course is called CPython, or Classic Python
(often just called Python) other implementations are Jthon and IronPython.
2. Using Python
Python can be used on through the command line
The command line is used to execute one line of Python code at a time. Note that the
commands executed this way cannot be saved.
To ensure that Python can be executed from any folder on a computer, the Path variable in
the Environmental Variables must be updated with the path of the Python installation.
Or the IDLE IDE
, The IDLE enables the programmer to save Python code in a file and execute all the code at
once. One can edit, debug and preview code in the IDLE.
3. Basic Elements in a Program
Programs consist of the following basic elements, a collection of literals, variables, and
keywords.
Literals
A literal is a number or string that appears directly in a program, e.g.
10 # Integer literal
10.50 # Floating-point literal
'Hello' # String literal
"World!" # String literal
'''Hello World!
It might rain today # Triple-quoted string literal
Tomorrow is Sunday'''
In Python, you can use both single and double quotes to represent strings. The strings that run
over multiple lines are represented by triple quotes.
Variables
Variables are used for storing data in a program. E.g.
l = 10
Length = 10
k= "Hello World!"
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