Basics of Python Programming
Chapter 5 Basics of Python Programming
New syllabus 2020-21
Informatics Practices
Class XI ( As per CBSE Board)
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Basics of Python Programming
Structure of a python program
Program
|->Module -> main program
| -> functios
| ->libraries
|->Statements -> simple statement
|
->compound statement
|->expressions -> Operators
|
-> expressions
|----objects ->data model
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Python basics
Python 3.0 was released in 2008. Although this version is supposed to be backward incompatibles, later on many of its important features have been back ported to be compatible with version 2.7
Python Character Set A set of valid characters recognized by python. Python uses the traditional ASCII character set. The latest version recognizes the Unicode character set. The ASCII character set is a subset of the Unicode character set. Letters :? A-Z,a-z Digits :? 0-9 Special symbols :? Special symbol available over keyboard White spaces:? blank space,tab,carriage return,new line, form feed Other characters:- Unicode
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Input and Output
var1=`Computer Science' var2=`Informatics Practices' print(var1,' and ',var2,' ) Output :-
Computer Science and Informatics Practices raw_input() Function In Python allows a user to give input to a program from a keyboard but in the form of string. NOTE : raw_input() function is deprecated in python 3 e.g. age = int(raw_input(`enter your age')) percentage = float(raw_input(`enter percentage')) input() Function In Python allows a user to give input to a program from a keyboard but returns the value accordingly. e.g. age = int(input(`enter your age')) C = age+2 #will not produce any error NOTE : input() function always enter string value in python 3.so on need int(),float() function can be used for data conversion.
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Indentation
Indentation refers to the spaces applied at the beginning of a code line. In other programming languages the indentation in code is for readability only, where as the indentation in Python is very important. Python uses indentation to indicate a block of code or used in block of codes.
E.g.1 if 3 > 2: print("Three is greater than two!") //syntax error due to not indented
E.g.2 if 3 > 2:
print("Three is greater than two!") //indented so no error
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