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PYTHON FUNDAMENTALS

                  Python Character Set

                                 
                                           Tokens
   Keyword
    Identifiers (Names)
 Literals
 Operators
 Punctuators
                                      Keywords
A keyword is a word having special meaning reserved by the programming language.

                              More on keywords….
¨We cannot use a keyword as variable name, function name or any other identifier.
¨ In Python, keywords are case sensitive.
¨All the keywords except True, False and None are in lowercase and they must be
    written as it is. The list of all the keywords are given below.
                                  Python Identifiers
¨Identifier is the name given to entities like class, functions, variables etc. in Python. It
    helps differentiating one entity from another.
                            Rules for writing identifiers
¨Identifiers can be a combination of letters in lowercase (a to z) or uppercase (A to Z) or
    digits (0 to 9) or an underscore (_). Names like myClass, var_1 and print_this_to_screen,
    all are valid example.
¨An identifier cannot start with a digit. 1variable is invalid, but variable1 is perfectly
    fine.
¨Keywords cannot be used as identifiers.
¨We cannot use special symbols like !, @, #, $, % etc. in our identifier.
¨Identifier can be of any length.
                                  Literals
¨String Literals
      ¡Single Line String
      ¡Multi Line String
      ¡Raw String
      ¡Unicode String
¨Numeric Literals
      ¡Integer
      ¡Float
      ¡Complex
¨Boolean Literals
¨Special Literals
¨Literal Collection
    ¡List
    ¡Tuple
    ¡Dictionary
    ¡Set
                                         Strings

                              Numeric Literals
¨Integer
    ¡Decimal
    ¡Binary Literal
    ¡Octal
    ¡Hexadecimal
¨Float
¨Complex

                              Boolean Literals
¨There are two kinds of Boolean literal: True and False.
Example:
¨x = (1 == True)
¨y = (1 == False)
¨a = True + 4
¨b = False + 10
¨print("x is", x)
¨print("y is", y)
¨print("a:", a)
¨print("b:", b)
                           Special Literal
Python contains one special literal i.e. None
     Example:
drink = "Available"
food = None
def menu(x):
    if x == drink:
        print(drink)
    else:
        print(food)
menu(drink)
menu(food)
                       Operators
¨Unary Operator (+, -, ~, not)
¨Binary Operator
¡Arithmetic Operator (+, -, *, /, %, **, //)
¡Relational Operator (<, >, <=, >=, ==, !=)
¡Logical Operator (and, or, not)
¡Bitwise Operator (&, ^, |, <<, >>)
¡Assignment Operator (=, +=, -=, *=, /=, %=,**=, //=)
¡Identity Operator (is, not is)
¡Membership Operator (in, not in)

Comments

  1. UnknownMarch 24, 2019 at 11:45 PM

    good job... worthy content... it's really very beneficial for other students ... keep it up...

    ReplyDelete

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