Python Programming Draft PPT.pptx

Python Programming Draft PPT.pptx

• 2.
  Agenda What is Python…? Differencesbetween program and scripting language History of Python Scope of Python Why do people use Python? Installing Python IDE Who uses python today What can I do with python A Sample Code Python code execution Running Python
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  Differences between programand scripting language Program a program is executed (i.e. the source is first compiled, and the result of that compilation is expected) A "program" in general, is a sequence of instructions written so that a computer can perform certain task. Scripting a script is interpreted A "script" is code written in a scripting language. A scripting language is nothing but a type of programming language in which we can write code to control another software application.
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  Python’s Benevolent DictatorFor Life “Python is an experiment in how much freedom program-mers need. Too much freedom and nobody can read another's code; too little and expressive-ness is endangered.” - Guido van Rossum
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  Scope of Python Science -Bioinformatics SystemAdministration -Unix -Web logic -Web sphere Web Application Development -CGI -Jython – Servlets Testing scripts
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  It's powerful - Dynamictyping - Built-in types and tools - Library utilities - Third party utilities (e.g. Numeric, NumPy, SciPy) -Automatic memory management It's portable - Python runs virtually every major platform used today -As long as you have a compatible Python interpreter installed, Python programs will run in exactly the same manner, irrespective of platform.
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  Installing Python Python ispre-installed on most Unix systems, including Linux and MAC OS X But for in Windows Operating Systems , user can download from the https://www.python.org/downloads/ - from the above link download latest version of python IDE and install, recent version is 3.4.1 but most of them uses version 2.7.7 only
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  Who uses pythontoday… Python is being applied in real revenue-generating products by real companies. For instance: Google makes extensive use of Python in its web search system, and employs Python’s creator. Intel, Cisco, Hewlett-Packard, Seagate, Qualcomm, and IBM use Python for hardware testing. ESRI uses Python as an end-user customization tool for its popular GIS mapping products. The Y ouTube video sharing service is largely written in Python
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  A Sample Code #A comment. #Another one. x = 34 - 23 y = “Hello” z = 3.45 if z == 3.45 or y == “Hello”: x = x + 1 # String concat. y = y + “ World” print x print y
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  Python Code Execution Python’straditional runtime execution model: source code you type is translated to byte code, which is then run by the Python Virtual Machine. Your code is automatically compiled, but then it is interpreted. Source code extension is .py Byte code extension is .pyc (compiled python code)
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  What is Python…? •Python is a general purpose high-level programming language that is often applied in scripting roles. • Python is programming language as well as scripting language. • Dynamic typed. • Source can be compiled or run just-in-time as Interpreted language. • Similar to perl, tcl, ruby. • Open source and community driven.
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  History Invented in theNetherlands, early 90s by Guido van Rossum Python was conceived in the late 1980s and its implementation was started in December 1989 Guido V an Rossum is fan of ‘Monty Python’s Flying Circus’, this is a famous TV show in Netherlands Named after Monty Python Open sourced from the beginning
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  Why was pythoncreated? "My original motivation for creating Python was the perceived need for a higher level language in the Amoeba [Operating Systems] project. I realized that the development of system Moreover, doing these things in the Bourne administration utilities in C was taking too long. shell wouldn'twork foravarietyof reasons. ... So, there was a need for a language that would bridge thegap between C and the shell” - GuidoVan Rossum
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  Why do peopleuse Python…? The following primary factors cited by Python users seem to be these: Python is object-oriented Structure supports such concepts as polymorphism, operation overloading, and multiple inheritance. Indentation Indentation is one of the greatest future in Python. It's free (open source) Downloading and installing Python is free and easy Source code is easily accessible
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  It's mixable - Pythoncan be linked to components written in other languages easily - Linking to fast, compiled code is useful to computationally intensive problems - - Python/C integration is quite common It's easy to use - No intermediate compile and link steps as in C/ C++ - Python programs are compiled automatically to an intermediate form called bytecode, which the interpreter then reads - This gives Python the development speed of an interpreter without the performance loss inherent in purely interpreted languages It's easy to learn - Structure and syntax are pretty intuitive and easy to grasp
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  After installing the PythonVer#2.7.7, go to start menu then click on python 2.7 in that one you can select python (command line) it is prompt with >>>
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  What can Ido with Python…? System programming Graphical User Interface Programming Internet Scripting Component Integration Database Programming Gaming, Images, XML , Robot and more
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  Enough to understandthe code Indentation matters to code meaning -Block structure indicated by indentation First assignment to a variable creates it - Variable types don’t need to be declared. -Python figures out the variable types on its own. Assignment is = and comparison is == For numbers + - * / % are as expected - Special use of + for string concatenation and % for string formatting (as in C’s printf) Logical operators are words (and, or, not) not symbols The basic printing command is print
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  Running Python Once you'reinside the Python interpreter, type in commands at will. • Examples: >>> print 'Hello world' Hello world # Relevant output is displayed on subsequent lines without the >>> symbol >>> x = [0,1,2] # Quantities stored in memory are not displayed by default >>> x # If a quantity is stored in memory, typing its name will display it [0,1,2] >>> 2+3 5