This document provides an introduction and overview of the Python programming language. It discusses that Python was created by Guido van Rossum in 1991, is open source and multi-paradigm, and can be used for web development, science, games, GUI applications, and more. It also presents some key aspects of the Python language like data types, operators, conditional and repetition structures, and how to use the Python interpreter and run Python programs.

1. Python Overview pt. 1
Ricardo Lapa Dani

2. Who am I?
• Ricardo Lapa Dani
• Pythonista since 2005
• Djangonaut
• Developer at Horizonte/Globosat
Rio de Janeiro – Brazil
• Free software enthusiast

3. About python
• Created by Guido Van Rossum
1991
• Free software / Open Source
• Widely used worldwide
• High-level script programming language
• Multi paradigm (procedural, functional,
object-oriented)
• General purpose (web, science, games, gui,
3d, mobile, etc..)
• Multi plataform (windows, linux, etc)

4. The ZEN of python
• Beautiful is better than ugly
• Explicit is better than implict
• Simple is better than complex
• Complex is better than complicated
• Readability counts.

5. The python interpreter
• Interactive interface to python
» python
ricardodani@MAC019214
Python 2.7.1 (r271:86832, Jul 31 2011, 19:30:53)
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build
2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 1 + 1
2
>>> 3*(7+2)
27
>>>

6. The python interpreter
• IDLE in Windows

7. Running python
programs
• Unix
% python filename.py
• Windows
C:Python> python.exe filename.py

8. Simple code sample

9. Language
Characteristics

10. Types
Integers:
10 20 -1 0 7 42 int(30) int(‘2’)
Float:
1.2 -4.3 5.2 float(10) 5.
Complex
5+7j -2+3j
Strings
‘Ricardo’ “Ricardo” ‘’’Ricardo’’’ u’Ricardo’
Lists
[1, 2, 4, 5, “Ricardo”, 1.2, [2, 4, 5]]
Dictionaries
{‘name’: Ricardo, ‘age’: 25, ‘friends_name’: [“Joaquim”, “Maria”]}

11. Comparation
1 == 2 False
1 == 1 True
1 in [1, 2, 4, 5] True
not 1 in [1, 2, 4, 5] False
“Lapa” in “Ricardo Lapa” True
1 > 2 False
1 <= 2 True
1 is (2 – 1) True
1 is True False

12. Logical operators
Arithmetic Operators
+
-
*
/
%
**
//
Comparasion Operators
==
!=
<>
>
<
>=
<=
Logical
and
or
not
Assignment Operators
=
+=
-=
*=
/=
%=
**=
//=
Membership Operators
in
not in
Identify Operators
is
is not

13. Condictional structures
IF / ELSE / ELIF
if <condition>:
do something
elif <another_condition>:
do another something
else:
do something else

14. Repetition Structures
For
for <element> in <iterable>:
iterate over each <element> of iterable
While
while <condition_is_true>:
do something

15. Source
• http://www.slideshare.net/amiable_indian/introduction-to-python
• http://en.wikipedia.org/wiki/Python_(programming_language)
• http://www.tutorialspoint.com/python/python_basic_operators.htm