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LEARN PYTHON

QUICKLY

AND

PYTHON CODING EXERCISES

CODING FOR BEGINNERS

WITH HANDS ON PROJECTS

BY

J J TAM

LEARN PYTHON

QUICKLY

CODING FOR BEGINNERS

WITH HANDS ON PROJECTS

BY

J J TAM

LEARN PYTHON QUICKLY

Well it is almost 5 years I started my IT career, I love to work in Java, and explore open source packages. Now a day I felt bored to work in Java, so want to learn new language, one of my friend suggested me to learn python. Immediately I thought, why should I learn python?

Following are some of the reasons that forced me to learn python(First and best reason is I am fed up in working with same language for 5 years.:))

a. Python is open source and is available on Windows, Mac OS X, and Unix operating systems. You can download and work with python for free.

b. Python is fun to experiment and easy to learn. Python provides interpreter that can be used interactively, which makes it easy to experiment with features of the language.

c. You can extend the python interpreter with new functions and data types implemented in C or C++

d. Python improves developer productivity many times as compared to C, C++ and Java.

e. No need to compile python program, it runs immediately after development.

f. We can easily port python project from one platform to another (Of course Java also provides this feature)

g. Rich in built library. Many third party open source libraries are available for logging, web development (Django the popular open source web application framework written in Python), networking, database access etc.

h. Python has very great community, whatever the problem you faced in python, you will get quick help.

Install python on MAC OS

Step 1: Download python software from following location. I downloaded pkg file to install on mac os.

https://www.python.org/downloads/

Step 2: Click the pkg file.

Press Continue.

Press Continue.

Accept license agreement and press Continue.

You can change the installation location use the button Change Install Location, and press the button Install.

Once installation is successful, you will get following screen.

Once installation is successful, open terminal and type python3 (Since I installed python 3.5).

$ python3

Python 3.5 . (v3 . 5.0 :f501f4567, Sep 2015 , ::)

[GCC 4.2 . (Apple Inc . build 5666 ) (dot )] on darwin

Type "help" , "copyright" , "credits" or "license" for more information .

>> > quit()

Use quit() to exit from python prompt.

Location of python3

$ which python3

/Library/Frameworks/Python.framework/Versions/3.5/bin/python3

$ which python3.5

/Library/Frameworks/Python.framework/Versions/3.5/bin/python3.5

On windows machines python usually placed at C:\Python35.

Python: Hello World program

Open any text editor and copy the statement print ('hello world') and save the file name as hello.py.

hello.py

print ('hello world')

Open terminal (or) command prompt, use the command python3 hello.py to run the file hello.py. You will get output like below

$ python3 hello.py

hello world

What happens when you instruct python to run your script?

Python first compiles your source code to byte code and sends it to python virtual machine (PVM). Byte code is the platform independent representation of your source code. PVM reads the byte code one by one and execute them.

Note:
Byte code is not machine understandable code, it is python specific representation.

Python interactive command line

Open command prompt (or) terminal and type python3 command. It opens python interactive session.

$ python3

Python 3.5.0 (v3.5.0:374f501f4567, Sep 12 2015, 11:00:19)

[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin

Type "help", "copyright", "credits" or "license" for more information.

>>>

How to exit from python interpreter

On Windows, a Ctrl-Z gets you out of this session; on Unix, try Ctrl-D instead. Another way is simply call the quit() function to quit from python.

$ python3

Python 3.5.0 (v3.5.0:374f501f4567, Sep 12 2015, 11:00:19)

[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin

Type "help", "copyright", "credits" or "license" for more information.

>>> quit()

$

You can type any statement (or) expressions in python interpreter, interpreter execute those statements and gives you the result.

>>> 10+20

>>> 20*20

>>> print('Hello World')

Hello World

Note:

On Unix, the Python 3.x interpreter is not installed by default with name python, so that it does not conflict with other installed Python 2.x executable.

Python: Operators

An operator is a symbol, which perform an operation. Following are the operators that python supports.

Arithmetic Operators

Relational Operators

Assignment Operators

Logical Operators

Bitwise Operators

Membership Operators

Identity Operators

Arithmetic Operators in python

Following are the arithmetic operators supported by python.

Operator	Description	Example
+	Addition	2+3
-	Subtraction	2-3
*	Multiplication	2*3
/	Division always returns a float value. To get only integer result use //.	2/3 returns 0.6666666666666666
//	Floor division discards the fractional part	2//3 returns 0
%	Returns the remainder of the division.	2%3
**	Power	2**3 returns 2 power 3 = 8

>>> +

>>> -

>>> /

2.0

>>> *

>>> //

>>> **

Relational Operators in python

Relational operators determine if one operand is greater than, less than, equal to, or not equal to another operand.

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