Answer:

Use the sorted method.

list = [3, 2, 1]
print sorted(list)

It will give:

[1, 2, 3]

Related posts:

1. List 10 most often used commands
2. How to debug in Python?
3. How to perform syntax check for Python program

Answer:

Try the following command in shell:

# python -c "import this"

And it will print out...

The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!

Related posts:

1. Quick and easy SMTP server with Python
2. How to perform syntax check for Python program
3. Installing Python modules with easy_install

Answer:

Assume you have a simple python script like:

a = 1
b = 2
c = a + b
print c

To enable debugging, add the following line at the top of the program

import pdb

and in the line you want to break, add

pdb.set_trace()

So the whole program become:

import pdb
a = 1
b = 2
pdb.set_trace()
c = a + b
print c

When you execute the script by python test.py, you will in the debug mode.

Some useful commands:

1. Print variables: p a
2. Step over: n
3. Continue: c
4. Quit: q

Related posts:

1. How to perform syntax check for Python program
2. What is “The Zen of Python”?
3. Quick and easy SMTP server with Python

Answer:

You can start a Python SMTP server, with only a single command, without installing any additional software in modern Linux.

E.g.

sudo python -m smtpd -n -c DebuggingServer localhost:25

Related posts:

1. Test if local SMTP server is running
2. Installing Python modules with easy_install
3. Install mlocate for quick file search in Linux

Answer:

You can use the built-in int() type constructor, e.g.

 int('123') == 123

Related posts:

1. Convert IP address to unsigned integer in MySQL
2. How to perform syntax check for Python program
3. Quick and easy SMTP server with Python

Answer:

Install Python modules cannot be easier with easy_install.

To use easy_install, you can use apt-get to install the "python-setuptools" package

# sudo apt-get install python-setuptools

Then you can use easy_install to install the module you want, e.g. pymongo

# sudo easy_install pymongo

Related posts:

1. Quick and easy SMTP server with Python
2. How to perform syntax check for Python program
3. How to remove install CPAN modules?

Answer:

Assume you have a simple Python script hello.py, you want to perform syntax check. You can use the following method

# python -c 'import hello'

Traceback (most recent call last):
  File "", line 1, in 
  File "hello.py", line 1
    echo "Hello, World!"

If there is any syntax error, it will prompt out to the screen.

Related posts:

1. How to perform syntax check for Perl program
2. How to perform syntax check on a bash script?
3. Perform syntax check to PHP files

Answer:

Sometimes, you want to share some files in a given directory in your Linux system to other people, you might consider setup a NFS, Samba, FTP or so.

However, the easiest method is to export the directory using HTTP, with the help of Python.

E.g.

 # cd /data/
python -m SimpleHTTPServer
Serving HTTP on 0.0.0.0 port 8000 ...

Now people can access the web server at port 8000 of your system's IP address, to access the /data directory.

Related posts:

1. How to get the IP address assigned to eth0 by a single command
2. Quick and easy SMTP server with Python
3. Rename directory in Linux