BASICS OF PYTHON 

Python basics like tokens, character set, expressions, statement, input and output.


A set of valid characters that a language can recognize. A Character represents any digit, letter or any other symbol. And python supports Unicode encoding standard.

  letters = A - Z , a - z
  digits = 0 - 9
  special symbol = space + -  / [ ] { } # * '  ''  ''' <=   >= != @ ( ) 
                               ** _(underscore)
  whitespaces = blank space, tabs , carriage return, newline,                                  formfeed
   Other characters = all ASCII and Unicode characters as data.


the smallest individual unit in a program is called a token or lexical unit or lexical element.
 they are sub divided into five parts 
1) keywords 
2) identifiers
3) literals 
4) operators
5) punctuators 

keywords - that convey a special meaning to the language compiler or interpreter. these are reserved for special purpose and must not be used as normal identifier names.
 Examples - false, true, if, else, elif, del, from, while, and, continue,                     except, def, import, not,  break, assert etc.

identifiers - identifiers are the building blocks of a program and are used as the general terminology for the names given to different parts of the program. variables, objects, classes, functions, lists, dictionaries etc.
--following rules for identifiers 
1) sequence of letters and digits
2) first character must be a letter and underscore count as letter.
3) all characters are significant and are case sensitive and executes differently upper case and lower case.

valid identifiers

BASICS OF PYTHON  BASICS OF PYTHON  Reviewed by Hack on August 27, 2019 Rating: 5

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