Introduction to Python

Python is high level, object oriented programming language, its code is interpreted while building the application

The aim is to give you precise description and understanding how Python is working and why it’s has so importance.


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Python  Advantages

Python is copyrighted. Like Perl, Python source code is now available under the GNU General Public License (GPL)

Python allows you to manipulate, manage and analyze data helping assist in decision making and creating efficiencies that will directly affect your bottom line. Whether you’re using it for business or to help manage personal database and expenses Python gives you the right tools to enable you to accomplish all your needs.-

Python can run in any cross-platform. It runs on many operating systems and different hardware. It is popularly used on GNU/Linux, Macintosh, and Microsoft Windows and Window Azure /Cloud Computing for analytics, running on both 32 and 64 bit processors.

Python is the most comprehensive statistical analysis package available. It incorporates all of the standard statistical tests, models, and analyses, as well as providing a comprehensive language for managing and manipulating data.

 Python is a programming language/scripting language and environment developed for statistical analysis by practicing statisticians and researchers. It reflects well on a very competent community of computational statisticians. ˆ

Scripting languages such as Python more productive than conventional languages for a programming problem involving string manipulation and search in a dictionary.Memory consumption was often "better than Java and not much worse than C or C++"

Python has been successfully embedded in many software products as a scripting language . It can also produce graphics output in PDF, JPG, PNG, and SVG formats, and table output for LATEX and HTML.

Python be used for?

Python  is a very versatile tool and can be used for almost anything that you can imagine:

• Abaqus,
• 3D parametric modeler ,
• 3D animation packages such as 3ds Max,
• Blender,
•  Cinema 4D,
• Lightwave,
• Houdini,
• Maya,
• modo,
• MotionBuilder,
• Softimage,
• the visual effects compositor Nuke,
• 2D imaging programs like GIMP,
• Inkscape, Scribus and Paint Shop Pro,
• Musical notation programs like scorewriter and capella.
• Python as the best choice for writing scripts in ArcGIS.
• It has also been used in several video games,adopted as first of the three available programming languages in Google App Engine,
• Python is also used in algorithmic trading and quantitative finance.
• Python can also be implemented in APIs of online brokerages that run on other languages by using wrappers.
• Cloud Computing and many more…..

Few Frequently used commands with meaning

• input = open('data', 'r')        Create input file ('r' means read).
• D1 = { } Empty dictionary
• D2 = {'Ax': 2, 'Bn': 3}         Two-item dictionary
• D2['User']        Indexing by key
• L.count(x)        Returns the number of occurrences of x in L
• L.index(x)        Returns the index of the first occurrence of x in L or raises an exception if L has no such item
• L.count(x)        Returns the number of occurrences of x in L
• L.index(x)        Returns the index of the first occurrence of x in L or raises an exception if L has no such item
• `expr,...`         String conversion
• {key:expr,...}   Dictionary creation
• [expr,...] List creation
• (expr,...) Tuple creation or simple parentheses
• f(expr,...)         Function call
• x[index:index] Slicing
• x[index] Indexing
• x.attr      Attribute reference
• x**y       Exponentiation (x to yth power)
• ~x Bitwise NOT
• +x, -x     Unary plus and minus
• x*y, x/y, x//y, x%y    Multiplication, division, remainder
• x+y, x-y Addition, subtraction
• x<<y, x>>y     Left-shift, right-shift
• x&y         Bitwise AND
• x^y        Bitwise XOR
• x|y         Bitwise OR
• x<y, x<=y, x>y, x>=y        Comparisons
• x<>y, x!=y, x==y      Equality/inequality tests*
• x is y, x is not y          Identity tests
• x in y, x not in y         Membership tests
• not x       Boolean NOT
• x and y   Boolean AND
• x or y      Boolean OR
• lambda arg,...: expr    Anonymous simple function