INF1511 EXAM PACK 2025

INF1511

EXAM
PACK

2025

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Visual Programming INF 1511

Unit 1- Python Environment & Data Operati ons

Describe the programming concepts for computi ng including performing arithmeti c
operati ons?
Outcomes:

1. Python and its features are explained.
2. Python is installed on different platforms.
3. Python is interacted with through Command Line Mode
4. A program is written in Python.
5. Comments, continuation lines and printing messages are written.
6. Arithmetic operations are performed.

Python:

 Object orientated programming language
 Implemented in C (Relies on portable C libraries)
 Cross-platform language
 Has a rich set of supporting libraries
 Supports scripting - Suitable for rapid application development

Python Implementation:

 Currently has 3 implementations:
o CPython
 Most up to date and complete implementation.
 Implemented in C.
 Cross-platform.
o Jython
 Java Virtual Machine (JVM) compliant.
 Use all Java libraries and frameworks.
o IronPython
 Implementation for Microsoft designed Common Language Runtime (CLR) known as .NET
 Use all CLR libraries and frameworks.

Python Features:

 Easy to learn.
 Easier to read syntax.
o Avoids the use of punctuation characters like { } $ / and \.
 Uses white space to indent lines.
 Python is free.
o Developed under open-source model.
 Large number of libraries included.
 Can be integrated with other languages.
o C, C++ and Java.
 Interpreted language.
o Supports a complete debugging and diagnostic environment.
 Good choice for web development, networking, games, data processing and business applications.
 Uses garbage collection for efficient memory management.
o Python run-time environment handles garbage collection.
o Reference counter ensures that no live objects are removed.
 Python supports exception handling.
o Errors are raised as exceptions.

Interacting with Python:




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Two ways to work with Python:

 Command line mode.
 IDLE IDE (Integrated development environment).

Command Line Mode

 Type python instructions ONE LINE at a time.
 OR import from other files or modules.
 Accessed through the Python (Command Line) in the group.
o Alternatively - Open from the command prompt
 Type python.
 Press ENTER
 ON OPENING of the Python (Command Line) menu item - Python command line window displays the Python
Prompt (>>>) where you can issue commands.
 History of the commands given is maintained

IDLE (Integrated Development Environment)

 Simple IDE.
 Comes standard with Python distribution.
 Combines an interactive interpreter with: #know this
o Code editing.
o Debugging tools.
o Several specialised browsers/viewers built into it.
 Automatic indentation and colours to code based on Python syntax.
 Complete Python keywords / user-defined values by pressing Alt + /

To Start IDLE:

 IDLE (Python GUI) from group of applications.
 Python shell will open.

Other methods to execute Python commands:

 Write and edit Python programs in ANY editor, then execute through IDLE (Example - Notepad)
 IDLE's built in editor

NOTE - Program will be saved as .py (extension shows that it is a Python program).

Writing Your First Program:

#This programme calculates the area of a rectangle.
#Input
l=8
b=5
a=l*b
#Processor
print("Area of rectangle",a)
#output
Area of Triangle 40


 Notes:

#Program consists of two variables, l and b, initialized to
values 8 and 5
#Variables, l and b, represents the length and breadth of a
rectangle
#l and b are multiplied - Result stored in a
#to run the module - press f5




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Data Types in Python:

 Operations applicable on an object depend on its data type.
o INTEGERS
 32 bits long
 Range from -2³² to 2³²-1
 Example: 10
o LONG INTEGERS
 Unlimited precision.
 Subject to the memory limitations of the computer
o FLOAT
 Known as double precision values
 64 bits long
 Example : 10.0
o BOOLEAN
 Can hold only one of two possible values
 TRUE or FALSE
o COMPLEX NUMBER
 3rd variable, a Real and imaginary component, both represented by float types
 IMAGINARY NUMBER ( j ) - Multiple of the square route of minus one
 Example:
√
2 + 3j -> 3 is the imaginary component equal to3 x −1.
o STRINGS
 Sequence of UNICODE characters
 Unicode - standard that uses 16-bit characters
 Enclosed in " " or ' ' - quotes
 Immutable
 Example :
a='hello world'
o LISTS
 Ordered sequence of values
 Enclosed in [ ] – bracket.
 Mutable
 Example :
a=['Kate','Mary','John',10]
o TUPLES
 Ordered, immutable sequence of values
 Enclosed in ( ) - parenthesis
 Example :
a=('Kate','Mary','John',10)
o SETS
 Unordered collections of values
 Enclosed in { } - curly brackets
 Example :
s1={10,11,20,63,100}
o DICTIONARIES
 Unordered collections of key/value pairs.
 Enclosed in { } - curly brackets, key/value separation : - colon, item separation , - comma
 Example :
s1={'John':80,'Kate':75}




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