python web

#!/usr/bin/env python
print "Content-Type: text/html\n"
var1=1
var2=2
str="Ambiorix_Rodriguez"
total=var1+var2
print("<h1> The sum of 1 + 2 is equal to : %s</h1>" % total)
print(str.count("o")) ## how many times 1 string is present

NOTE chmod 755 myscript.py

https://docs.python.org/2/howto/webservers.html

Install Apache & Python on Ubuntu 16.04 LTS

• September 2, 2016
• Ubuntu
• 0 Comments

We’ll be using a freshly installed server with Ubuntu Server 16.04, Ubuntu Desktop should also work.

By default Ubuntu 16.04 ships with Python 3 but you won’t be able to call it if you issue the following at shell:

1	python --version

You’ll instead be greeted by this error message:

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The program 'python' can be found in the following packages: * python-minimal * python 3 Try: sudo apt install 'package'

Instead if you issue the following, you’ll get the proper version:

1	python3 --version

1	Python 3.5.2

So to get the OS to call python when we just type python at the terminal we need to do the following:

1	sudo ln -s /usr/bin/python3 /usr/bin/python

Note: If you have an older version of python installed you will need to first remove the link to it and then create the new one, here’s how:

1	sudo rm /usr/bin/python

Moving on, time to install the package manager for python, pip

1	sudo apt-get install python3-pip

Now to install Apache, 

1	sudo apt-get install apache2

Create a directory to hold the python files

1	sudo mkdir /var/www/pythontest

Next, to register python with apache we must disable multithreading processes

1	sudo a2dismod mpm_event

Now to give apache permission to run the scripts

1	sudo a2enmod mpm_prefork cgi

Next, modify apache’s configuration to set Python files as runnable and allow them to be executed

1	sudo vi /etc/apache2/sites-enabled/000-default.conf

Add the following block right under the Virtualhost start declaration, usually right after the first line:

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<Directory /var/www/pythontest>     Options +ExecCGI     DirectoryIndex index.py </Directory> AddHandler cgi-script .py

Next, change Apache’s default document root to your newly created pythontest directory, look for the word DocumentRoot in the same config and change to:

1	DocumentRoot /var/www/pythontest

Restart Apache:

1	sudo service apache2 restart

Now it’s time to test things, create a index.py file in the set directory and add the sample Hello World script:

1 2	cd /var/www/pythontest vi index.py

Add the following:

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#!/usr/bin/python print() print ("Hello World!");

Save, and hit your server’s IP in your browser and you should see the “Hello World!” text.

Note: Python3 requires updated syntax to function properly, you may see HTTP 500 Internal Server errors with the old syntax

DEBUG OPTION 

tail -f /var/log/apache2/error.log

Web configuration

nano /etc/apache2/sites-enabled/000-default.conf

<VirtualHost *:80>

        # The ServerName directive sets the request scheme, hostname and port that

        # the server uses to identify itself. This is used when creating

        # redirection URLs. In the context of virtual hosts, the ServerName

        # specifies what hostname must appear in the request's Host: header to

        # match this virtual host. For the default virtual host (this file) this

        # value is not decisive as it is used as a last resort host regardless.

        # However, you must set it for any further virtual host explicitly.

        #ServerName www.example.com

        ServerAdmin webmaster@localhost

        DocumentRoot /var/www/html

        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,

        # error, crit, alert, emerg.

        # It is also possible to configure the loglevel for particular

        # modules, e.g.

        #LogLevel info ssl:warn

        ErrorLog ${APACHE_LOG_DIR}/error.log

        CustomLog ${APACHE_LOG_DIR}/access.log combined

        # For most configuration files from conf-available/, which are

        # enabled or disabled at a global level, it is possible to

        # include a line for only one particular virtual host. For example the

        # following line enables the CGI configuration for this host only

        # after it has been globally disabled with "a2disconf".

        #Include conf-available/serve-cgi-bin.conf

<Directory /var/www/html/pythontest>

    Options +ExecCGI

    DirectoryIndex index.py

</Directory>

AddHandler cgi-script .py

</VirtualHost>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet