01 python introduction

01 python introduction

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  Course No.: 803427-3 By Dr.Tamer Ahmed Farrag Introduction to Python
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  2 Why Python?  Free Easy to learn  Easy communication  Efficient code  Universal  Rich collection of numerical methods, plotting or data processing tools.
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  3 Python Language Python, ageneric and modern computing language: • The language: flow control, data types (string, int), data collections (lists, dictionaries), etc. • Modules of the standard library: string processing, file management, simple network protocols. • A large number of specialized modules or applications written in Python: web framework, etc. … and scientific computing. • Development tools (automatic testing, documentation generation) Unlike Matlab, or R, Python does not come with a pre-bundled set of modules for scientific computing.
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  4 Most important Add-onlibraries
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  5 Installing Python There istwo ways to Start working with python: 1- download and install the python language interpreter from the official web site : https://www.python.org/ Then start to install the required libraries one by one. 2- install a scientific-computing distribution, that comes readily with optimized versions of scientific modules. For Example: - Anaconda (recommended) - EPD - WinPython Download Anaconda from : https://www.anaconda.com/download/ choose your Operating system and python 3.7
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  6 ANACONDA distribution overview
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  7 interactive environments and texteditors There is many methods to start programming using python includes: 1- Using Command window 3- Using Interactive environments 2- Using Text Editors and IDEs  Using Command window: • Open anaconda prompt • Type Python ⏎ (The python command windows is start working)
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  8 interactive environments and texteditors (cont.)  Using Interactive environments (my recommend method during learning)  an interactive work with the IPython console from anaconda prompt, or its offspring, the Jupyter notebook from Anaconda Navigator.  Start Anaconda Navigator  Launch Jupyter notebook and start working See also • IPython user manual: http://ipython.org/ipython-doc/dev/index.html • Jupyter Notebook QuickStart: http://jupyter.readthedocs.io/en/latest/content-quickstart.html
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  9 interactive environments and texteditors (cont.)  Using Text editors and IDEs  Tens IDEs are available for python but the best of them includes: • Microsoft Visual Studio • Pycharm IDE • Pydev IDE • Vim • Atom • Netbeans See also https://www.visualstudio.com/vs/python/
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  10 Python Language Python isa programming language, as are C, Fortran, BASIC, PHP, etc. Some specific features of Python are as follows: • an interpreted (as opposed to compiled) language. Python can be used interactively. • a free software released under an open-source license: Python can be used and distributed free of charge, even for building commercial software. • multi-platform: Python is available for all major operating systems. • a very readable language with clear non-verbose syntax • a language for which a large variety of high-quality packages are available for various applications, from web frameworks to scientific computing. • a language very easy to interface with other languages, in particular C and C++. • Some other features of the language are illustrated just below. For example, Python is an object-oriented language, with dynamic typing (the same variable can contain objects of different types during the course of a program).
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  11 Python Basics • CommandLine Window The >>> is called a prompt. This is where python waits for instructions. It is like an ear constantly waiting for orders to be executed. Entering an instruction means typing it at the command line prompt and pressing return. >>> >> x = 9 # assign the value 9 to x
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  12 Python Variables  Avariable is a name that refers to a value.  In Python, No need to declare variables  An assignment statement creates new variables and gives them values.
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  13 Python Variables (cont.) Programmers generally choose names for their variables that are meaningful and document what the variable is used for.  Variable names can be arbitrarily long.  They can contain both letters and numbers, but they cannot start with a number.  They can contain underscore character (_).  If you give a variable an illegal name, you get a syntax error.  Python's keywords cannot be used as variable names. Python reserves 33 keywords:
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  14 Python Operators Precedence
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  15 Python Operators Example
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  16 Asking the userfor input  Python provides a built-in function called input that gets input from the keyboard.  When this function is called, the program stops and waits for the user to type something.  When the user presses Return or Enter, the program resumes and input returns what the user typed as a string.
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  17 Comments  Comments inPython start with the hash character, #, and extend to the end of the physical line.  A comment may appear at the start of a line or following whitespace or code, but not within a string literal.  A hash character within a string literal is just a hash character.  Comments are to clarify code and are not interpreted by Python, they may be omitted when typing in examples.
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  18 Resources  Scipy LectureNotes http://www.scipy-lectures.org/  Python for Everybody https://www.py4e.com/  Python official documentation https://docs.python.org  Anaconda web site https://www.anaconda.com