Python Overview pt. 1 Ricardo Lapa Dani

Who am I?

• Ricardo Lapa Dani• Pythonista since 2005•Djangonaut•Developer at Horizonte/Globosat Rio de Janeiro – Brazil• Free software enthusiast

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)

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.

The python interpreter

• Interactive interface to python» python ricardodani@MAC019214Python 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 darwinType "help", "copyright", "credits" or "license" for more information.>>> 1 + 12>>> 3*(7+2)27>>>

The python interpreter

• IDLE in Windows

Running python programs

•Unix

% python filename.py

•Windows

C:\Python\> python.exe filename.py

Simple code sample

Language Characteristics

TypesIntegers:

10 20 -1 0 7 42 int(30) int(‘2’)

Float:1.2 -4.3 5.2 float(10) 5.

Complex5+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”]}

Comparation1 == 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

Logical operatorsArithmetic Operators

+

-

*

/

%

**

//

Comparasion Operators==

!=

<>

>

<

>=

<=

Logicaland

or

not

Assignment Operators=

+=

-=

*=

/=

%=

**=

//=

Membership Operatorsin

not in

Identify Operatorsis

is not

Condictional structuresIF / ELSE / ELIF

if <condition>:

do something

elif <another_condition>:

do another something

else:

do something else

Repetition StructuresFor

for <element> in <iterable>:

iterate over each <element> of iterable

While

while <condition_is_true>:

do something

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