Python {TUTORIAL} [Hard to understead, easy to use]

What is Python?
Beafore to star, you have to know what is Python.
Python is a unpopular language.Is often compared to Perl.
Python, is a scripting languaje,this means it is interpreted rather than compiled, so it saves time during debugging and early development.

Python is a high level language - this means that you can write big programs very fast and easier than with low level languages like C/C++.



Installing Python
First you need to download the program from http://www.python.org/download.


Runing Python
If you want to check something simple run the Python interpreter by typing python or following a shortcut (Windows). The interpreter isn’t very useful for large pieces of code so generally you would want to use your favorite text editor to create the scripts and then execute them.

Coding
Only one thing before that in other languages statements are separated by braces and such - Python identifies statements by indentation only.

Code (Text):

1. #!/usr/bin/env python
2.  
3. # This is a comment
4. # comments can span one line only
5.  
6. print 'Hello world!'
7. print "Hello world!"
8.  

You can delimit strings with single or double quotes - it doesn’t make any difference to Python. If you want to write a string on more than one line you can escape the end of the line with a backslash:

Code (Text):

1. foo = "I'm a very long string
2.     which spans multiple lines"
3. print foo
4. or use HereDoc syntax with “”" or ‘'’:
5.  
6. foo = """I am a really long
7.     comment but it doesn't
8.     matter no backslashes are
9.     needed
10. """
11.  

You can also access directly single characters or slices from a string

Code (Text):

1. foo = "Hello"
2. print foo[1] # outputs "e" since indexing starts at 0
3. print foo[1:] # ello
4. print foo[-1:] # o
5. print foo[2] # ll
6.  

Control structures

Code (Text):

1. if 1 == 2 :
2.     print 'One equals two'
3. else :
4.     print 'One does not equal two'
5.  

As you have noticed no braces are used, just indent, this promotes readable code.

Code (Text):

1. if 1 < 2 :
2.     print 'One is lesser than two'
3. elif 1 > 2 :
4.     print 'One is greater than two'
5.  

Loops

Code (Text):

1. for i in range(0, 10) :
2.     if i % 2 == 0 :
3.         print i, 'is an even number'
4.     else :
5.         print i, 'is an odd number'
6.  

This example will loop through the numbers from 0 to 10 and test if the number is odd or even. The modulus operator (%) is used to calculate the remainder from dividing the number by two.

The same example can be rewritten also with a while loop.

Code (Text):

1. i = 0
2.  
3. while i <= 10 :
4.     if i % 2 == 0 :
5.         print str(i) + ' is an even number'
6.     else :
7.         print str(i) + ' is an odd number'
8.     i += 1
9.  
10. i = 'Hello world'
11. print i
12.  

This example also shows that even though Python’s variables are loosely typed (you can assign any type of data to a single variable), you have to convert them to a single type if you want to operate on different kind of variables.

To save the space that print adds between different parameters passed to it, you also have to add it to the string (when using string concatenation).

Command-line parameters

Code (Text):

1. import sys
2.  
3. print sys.argv[0] # prints the filename of your script
4. print sys.argv[1] # and the first parameter
5. print sys.argv[1:] # or all parameters
6.  

If you want to pass parameters from the command line you will need the sys module, which is imported on the first line of the example. The module defines the argv list which contains the arguments to the script.

Lists in Python are something similar to arrays in other languages yet Python has arrays also, which are more functional than lists so if you want to use arrays you would have to import the array module.







If you like it, give me +rep, please.

 

Plus rep for you mister

 

Hey,, thx ^^

 

java is already kinda confusing but this is :shock:

 

lol,, yes
i know,,
it take TO many time learn this,,
but with practice,, your can make AWSOME things

 

agreed :? ...i'm learning java at school and we can barely do anything right now...

 

Thanks for the post. Pretty informative information. Python is a blast and believe it or not , Not many ppl use it.

 

WOW THANK FOR THE INFORMATION

 

I like your guide, but unfortunatly I have never used any programming and don't understand the commands. Can you point me in the direction of some coding tutorials so that I can get on my feet?

+rep!

 

I start with visual basic
And thx for the rep

 

Python.. I was trying to learn that, I swear it scrambled my brain

 

it seems to have lots of things to make, right?
but ill take time to learn it lol

 

kadam, please don't gravedig.

 

Its not grave-digging if its still on the first page, please, refine your vocabulary.

 

Grave digging is when you post on really old topics... like this one

The last post before yours was over 2 weeks ago >__<

 

You people don't know the meaning of gravedigging, see its still on the first page, If I want to post in it I can, if it was on the 4th page(Note there isn't a 4th page), I wouldn't have though.