1. 24/03/2014 Kevin Van Wilder - Django & Python 1 Python 24-03-2014 Kevin Van Wilder

2. 24/03/2014 Kevin Van Wilder - Django & Python 2 Archeological finds suggest... 1991 Python 1.0 Guido van Rossum 2000 Python 2.0 Scripting in Operating Systems Recent years: Endorsed by Google 2005 Django 2008 Python 3.0 Backwards Incompatible 2009 MIT switches to Python to teach Computer Science to students (6.001) 3. 24/03/2014 Kevin Van Wilder - Django & Python 3 Python is used for... Rapid Prototyping Web application development Scientific calculations XML Processing Database applications GUI applications Glue language for different systems 4. 24/03/2014 Kevin Van Wilder - Django & Python 4 What is Python? Easy to learn and master Clean and clear syntax Very few keywords High Level data types Compact Highly portable Runs everywhere Highly extensible Libraries may be written in python or C/C++ 5. 24/03/2014 Kevin Van Wilder - Django & Python 5 What is Python? High Level Programming Language Interpreted Language Works similar to Java behind the scenes Source compiles to Bytecode (.pyc files) Bytecode is translated on a virtual machine as machine code. Different implementations of the interpreter: CPython (reference implementation) Jython (Java-based implementation) PyPy (JIT implementation) Read-Eval-Print Loop (REPL) 6. 24/03/2014 Kevin Van Wilder - Django & Python 6 Variables & Types No declaration Everything has an object type Integer division like in C High level data types Collections, Lists vs Tuples, Dicts Auto unpacking >>> a = 1 >>> a 1 >>> type(a) >>> a = Hello >>> type(a) >>> 5/2 2 >>> 5.0/2 2.5 >>> x, y = 2, 3 >>> x 2 >>> y 3 7. 24/03/2014 Kevin Van Wilder - Django & Python 7 Logic Flow For, while loops Generators Exception Handling >>> for ch in Hello: print ch H e l l o >>> for i in range(3): print i 0 1 2 >>> >>> try: connect_to_a_broken_server() except ConnectionError as e: print Stuff is broken! finally: print End of the line Stuff is broken! End of the line >>> 8. 24/03/2014 Kevin Van Wilder - Django & Python 8 Classes Class statement First class citizen use as: Parameter Return value Variable assignment >>> class Foo(object): . def __init__(self): . self.member = 1 . def get_member(self): . return self.member . >>> Foo >>> f = Foo() >>> f >>> f.get_member() 1 >>> 9. 24/03/2014 Kevin Van Wilder - Django & Python 9 The Language Object-Oriented Everything is internally an object, even integers and strings Supports imperative, functional and procedural development Minimalistic Indentation defines scoping No line delimiters Dynamically and Strongly Typed Packages, Modules 10. 24/03/2014 Kevin Van Wilder - Django & Python 10 Standard Library Very large set of modules with diverse functionality: All internet protocols, sockets, cgi, os services GUI, database, calendar, file operations Debugging, profiling Threading, synchronization http://docs.python.org/2/library/ 11. 24/03/2014 Kevin Van Wilder - Django & Python 11 Third party libraries Awesome python libraries Requests http://docs.python-requests.org Pillow http://pillow.readthedocs.org Dateutil https://pypi.python.org/pypi/python-dateutil DocOpt https://pypi.python.org/pypi/docopt But also: And about 40.000+ more! Numerical analysis, sql databases, fortran, xml, win32, serial connections, qt, tkinter, etc etc etc etc etc 12. 24/03/2014 Kevin Van Wilder - Django & Python 12 Python is... The syntax The standard library The external library The community 13. 24/03/2014 Kevin Van Wilder - Django & Python 13 Learning Resources Learn Python The Hard Way (not really) - http://learnpythonthehardway.org/ Crash Into Python - http://www.learnpython.org/ Read The Fine Manual http://docs.python.org/