a useful weblink of python to freshman

http://www.tutorialspoint.com

the catalogue of this web:

Python
Basics

Python
- Home
Python
- Overview
Python
- Environment
Python
- Basic Syntax
Python
- Variable Types
Python
- Basic Operators
Python
- if...else
Python
- while Loop
Python
- for Loop
Python
- Loop Control
Python
- Numbers
Python
- Strings
Python
- Lists
Python
- Tuples
Python
- Dictionary
Python
- Date & Time
Python
- Functions
Python
- Modules
Python
- Files I/O
Python
- Exceptions

Python
Advanced

Python
- Classes/Objects
Python
- Reg Expressions
Python
- CGI Programming
Python
- Database Access
Python
- Networking
Python
- Sending Email
Python
- Multithreading
Python
- XML Processing
Python
- GUI Programming
Python
- Further Extensions

Python
Useful References

Python
- Quick Guide
Python
- Tools/Utilities

Python
Useful Resources

Python
Useful Resources