chapter 3 fundamental concepts

TALENTS FOR DEVELOPMENT - Petrovietnam UniversityChapter 3: Fundamental conceptsLecturer: Tran Ngoc Hiep, MSc.Email: hieptn@pvu.edu.vnMobile: 0901 252468ContentsStructure of Python prog

TALENTS FOR DEVELOPMENT - Petrovietnam University

 Chapter 3: Fundamental concepts

Lecturer: Tran Ngoc Hiep, MSc.

Email: hieptn@pvu.edu.vn Mobile: 0901 252468

Contents

Structure of

Python program Basic concepts Variables

Python Basic Data Types Input – Output in Python 1

Tran Ngoc Hiep, MSc Foundations of Engineering II- PVU

TALENTS FOR DEVELOPMENT - Petrovietnam University

Sample program

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3.1 Structure of Python program

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3.2 Basic concept

In Python, each individual statement must be ended with “enter”

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Semicolons :

3.2 Basic concept Block in Python:

 Python uses indentation to indicate a block of code

 All the statements inside the block is treated as

one unit Blocks are used as the body in constructs

like function, if-else and loop, which may contain

multiple statements but are treated as one unit.

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3.2 Basic concept Comments:

 Program comments are explanatory statements

that you can include in Python code and helps

anyone easier to read and understand.

 Python support single-line and multi-line

comments

 Single Line Comment Multi Line Comment

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3.2 Basic concept Keyword :

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3.3 Variables

 A variable is a location in computer memory

where a value can be stored

 Variables must be declared before they are used in

a program.

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3.3 Variables

Variable

Name

Type

Size Value

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TALENTS FOR DEVELOPMENT - Petrovietnam University

3.3 Variables Variable naming:

 We can naming the variables by using:

 Upper case letter

 Lower case letter

 Digits (0 to 9)

 Underscore

 Keywords: can not be used as variable name.

Example:

 Number, phoneNumber, _firstName…

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3.3 Variables

1 • Always the first character of a variable must be a letter or an underscore.

2 • The variable name can not start with a digit.

3 • Other character should be either letters, digits, underscores.

4 • There is no limit for the length of variables.

5 • Declared keywords cannot be used as a variable name.

6 • Upper and lower case letter are distinct.

The rules of naming variables :

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TALENTS FOR DEVELOPMENT - Petrovietnam University

3.3 Variables Variable Declaration:

 Take note:

 In Python, you don’t need to declare the name of variable

before it can be used

 Python is not a “ Strongly-type ” language.

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3.3 Variables

 Declaration and Initialization of Variable

 Python has no command for declaring a variable.

 A variable is created the moment you first assign a

value to it.

 Example:

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3.3 Variables

 Declaration and Initialization of Variable:

 Initialization means assigning value to an already

declared variable.

 Initialization and declaration can be done in single step

also.

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3.4 Python Basic Data Types 15

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3.4 Python Basic Data Types

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3.5 Input - Output in Python

 To input and output data in Python we use input() and

print() methods.

 Examples:

print - object providing a connection to the monitor

input - object providing a connection to the keyboard

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TALENTS FOR DEVELOPMENT - Petrovietnam University

3.5 Input - Output in Python

 Example:

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Summary

1 • Structure of Python program

2 • Basic concept: Identity, keyword, comment…

3 • Declaring and using variable

4 • Basic datatype in Python

5 • Input/output in Python

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Tran Ngoc Hiep, MSc Foundations of Engineering II- PVU

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Quiz

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Discussion 21

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