What is syntax

  • Syntax:

    • A language syntax defines a set of rules that specify a correct computer program.

  • Language syntax elements:

    • Identitifiers:

      • An identifier is a name used to identify a variable, function, class, module or other object.

      • An identifier starts with a letter A to Z or a to z or an underscore (_)

    • Keywords

    • Puntuation symbols

Python keywords (Reserved Words)

  • The following list shows the Python keywords: 

       and 	        as 	        assert
   break 	class		continue
   def		del		elif
   else 	except		False
   finally 	for		from
   global 	if		import
   in		is	        lambda
   None 	nonlocal 	not
   or		pass		raise
   return 	True		try
   while 	with		yield

    These are reserved words

    You cannot use them as identifiers

Python execution modes

  • A Python program can be executed in two different modes of execution:

    1. Interactive Mode:

      • Each Python statement is typed in into the Python interpreter interactively

      • The statement typed is executed immediately by the Python interpreter

    2. Script Mode:

      • The Python program is first stored in a script (file)

      • Then the Python program is executed by the Python interpreter