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PYTHON - VARIABLES AND OPERATORS

PYTHON - VARIABLES AND OPERATORS. 12 th COMPUTER SCIENCE LESSON - 5. Padasalai.Net. Introduction. Python is a general purpose programming language

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PYTHON - VARIABLES AND OPERATORS

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  1. PYTHON - VARIABLES AND OPERATORS • 12thCOMPUTER SCIENCE • LESSON - 5 Padasalai.Net

  2. Introduction • Python is a general purpose programming language • It is created by Guido Van Rossum from CWI (Centrum Wiskunde & Informatica) which is a National Research Institute for Mathematics and Computer Science in Netherlands. • The language was released in I991.

  3. Key features of Python • It is a general purpose programming language which can be used for both scientific and non-scientific programming. • It is a platform independent programming language. • The programs written in Python are easily readable and understandable.

  4. Programming in Python • Interactive mode • Script mode

  5. Interactive mode Programming • In interactive mode Python code can be directly typed and the interpreter displays the result(s) immediately. Script mode Programming • A script is a text file containing the Python statements. • Python Scripts are reusable code

  6. Creating Scripts in Python • FILE -> NEW • CTRL + N Saving Python Script • FILE -> SAVE • CTRL + S Executing Python Script • RUN -> RUN MODULE • F5 • For all error free code, the output will appear in the IDLE window of Python

  7. Input and Output Functions • input() • print()

  8. input() function Variable = input(“prompt string”) • input( ) function is used to accept data as input at run time • The input( ) takes whatever is typed from the keyboard and stores the entered data in the given variable. • prompt string is used, it is displayed on the monitor; the user can provide expected data from the input device • The input ( ) accepts all data as string or characters but not as numbers • int( ) function is used to convert string data as integer data explicitly

  9. Print() function print(“String”) print(variable) print(“String”,variable) print(variable ,“String”, variable ,“String”) • The print() function is used to display result on the screen • Comma ( , ) is used as a separator in print ( ) to print more than one item.

  10. Comments in Python • comments begin with hash symbol (#) • Comments may be single line or no multi-lines. Indentation • Python uses whitespace such as spaces and tabs to define program blocks • All statements within the block must be indented with same amount spaces.

  11. Tokens • Python breaks each logical line into a sequence of elementary lexical components known as Tokens. • Identifiers • Keywords • Operators • Delimiters • Literals

  12. Identifiers • An Identifier is a name used to identify a variable, function, class, module or object. • An identifier must start with an alphabet (A..Z or a..z) or underscore ( _ ). • Identifiers may contain digits (0 .. 9) • Python identifiers are case sensitive i.e. uppercase and lowercase letters are distinct. • Identifiers must not be a python keyword. • Python does not allow punctuation character such as %,$, @ etc., within identifiers.

  13. Keywords • Keywords are special words used by Python interpreter to recognize the structure of program. • Identifiers must not be a python keyword.

  14. Operators • In computer programming languages operators are special symbols which represent computations, conditional matching etc. • The value of an operator used is called operands. • Arithmetic operators • Relational or Comparative operators • Logical operators • Assignment operators • Conditional operator

  15. Arithmetic operators • An arithmetic operator is a mathematical operator that takes two operands and performs a calculation on them.

  16. Relational or Comparative operators • A Relational operator is also called as Comparative operator which checks the relationship between two operands.

  17. Logical operators • Logical operators are used to perform logical operations on the given relational expressions.

  18. Assignment operators • = is a simple assignment operator to assign values to variable.

  19. Ternary operator • Ternary operator is also known as conditional operator that evaluate something based on a condition being true or false. • It simply allows testing a condition in a single line

  20. Delimiters • Python uses the symbols and symbol combinations as delimiters in expressions, lists, dictionaries and strings

  21. Literals • Literal is a raw data given in a variable or constant • Numeric • String • Boolean Numeric Literals • Numeric Literals consists of digits and are immutable String Literals • In Python a string literal is a sequence of characters surrounded by quotes. • Python supports single, double and triple quotes for a string. Boolean Literals • A Boolean literal can have any of the two values: True or False.

  22. Escape Sequences • The backslash "\" is a special character, also called the "escape" character. • It is used in representing certain whitespace characters

  23. Python Data types • Number • String • Boolean • Tuples • lists • dictionaries

  24. எந்தஅளவுநீஉயர்ந்தவனாகவேண்டும்என்றுநினைக்கிறாயோஅந்தஅளவுக்குகடுமையானசோதனைகளைநீகடந்துசெல்லவேண்டும்எந்தஅளவுநீஉயர்ந்தவனாகவேண்டும்என்றுநினைக்கிறாயோஅந்தஅளவுக்குகடுமையானசோதனைகளைநீகடந்துசெல்லவேண்டும் CELL : 9524756933 MAIL : mrajivgandhibcomca@gmail.com

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