PYTHON is a high-level programming language which is used in thousands of
real-world business applications.It is an interpreted language. i.e. we can execute python
programs by using an interpreter instead of a compiler.
The interpreter can be used for the execution of programs in any of the following two modes
- interactive mode :-interpreter reads and executes commands.
- script mode :-it reads and executes a script from a file.
Python’s interactive mode makes it easy to test short snippets of code.
To run python interpreter interactively, just type $ python in the terminal.
Before printing the first prompt(>>>),the interpreter prints a welcome message stating its
version number and a copyright notice as shown below .
Python 2.6.6 (r266:84292, Sep 15 2010, 15:52:39)
[GCC 4.4.5] on linux2
Type “help”, “copyright”, “credits” or “license” for more information.
The three right-angle brackets ,”>>>” is a python prompt indicating that the interpreter is
ready to use. One problem of the interactive mode is that , if we want to use them again the
next time,we have to type them all over again.So these definitions are stored in a separate
file ,called module or script and it is saved on disk.We can use this script later. Python files
have .py extension. For the execution of a script , the file name should be specified.