PEP8

1. Python code indented with 4 spaces.

2. None Compare.

• Don’t

if some == None:

• Good

if some is None:

3. boolean Compare.

• Don’t

if some == True:

• Good

if some:

4. Type comparison.

• Don’t

if type(c) is type type(a):

• Good

import types

if isinstance(c, types.ListType)

5. Only use the is operator to check the exact identity of two references.

if some_list is None:
    do_somthing_with_the_list()

6. Duck Type

In Python, it will not check the type before execute, and also python don’t recommand to do that, for example below:

sorted([1,2,3])

sorted({1,2,3})

sorted({"k1":1, "k2":2, "k3":3})