Python Code Style

I think it is very important to write clear code if you want that somebody can read and maybe improve it.This is not my advices, you can read original on http://docs.python-guide.org/en/latest/

Check if variable equals a constant

You don’t need to explicitly compare a value to True, or None, or 0 - you can just add it to the if statement. See Truth Value Testing for a list of what is considered false.

Bad:

if attr == True:
    print 'True!'

if attr == None:
    print 'attr is None!'

Good:

# Just check the value
if attr:
    print 'attr is truthy!'

# or check for the opposite
if not attr:
    print 'attr is falsey!'

# or, since None is considered false, explicitly check for it
if attr is None:
    print 'attr is None!'

Access a Dictionary Element

Don’t use the dict.has_key() method. Instead, use x in d syntax, or pass a default argument to dict.get().

Bad:

d = {'hello': 'world'}
if d.has_key('hello'):
    print d['hello']    # prints 'world'
else:
    print 'default_value'

Good:

d = {'hello': 'world'}

print d.get('hello', 'default_value') # prints 'world'
print d.get('thingy', 'default_value') # prints 'default_value'

# Or:
if 'hello' in d:
    print d['hello']