- list comprehension

- iterators and generators

- decorators

- GIL

- immutables

- old vs. new style classes

- / vs. // division

- unicode vs. str type

- PEP8

- NoSQL databases

- SQL database query optimization

- git branching

- __new__ vs. __init__

- map, filter, reduce

def extendList(val, list=[]):
    list.append(val)
    return list

def multipliers():
    return [lambda x : i * x for i in range(4)]

test = [[]]*5
test[0].append(1)

for i in range(10000):
	print "test"

a = ["test"] * 100
result_string = ""
for item in a:
	result_string += item + ' '

test = {
	0: 'falsy zero',
	1: 'truthy one',
	False: 'falsy False',
	True: 'truthy True'
}

A is a list of integers of length N where for any A[n] where 0<=n<N A[n] < A[n+1]. Write a binary search function to locate an index of given number in A or -1 if number is not existing in list.

For example:

>>> A = [1, 2, 5, 7, 9, 12, 15]

>>> print binary_search(5)

... 2

>>> print binary_search(6)

... -1