Progress Bar

ProgressBar_py

enumerate

>>> for i,w in enumerate('hello world'):
...   print i, w
... 
0 h
1 e
2 l
3 l
4 o
5  
6 w
7 o
8 r
9 l
10 d

>>> for i in enumerate('hello world'):
...     print i
...
(0, 'h')
(1, 'e')
(2, 'l')
(3, 'l')
(4, 'o')
(5, ' ')
(6, 'w')
(7, 'o')
(8, 'r')
(9, 'l')
(10, 'd')

make matrix

ref: http://stackoverflow.com/questions/974931/multiply-operator-applied-to-listdata-structure

def make_matrix(rows, columns):
"""
  >>> make_matrix(4, 2)
  [[0, 0], [0, 0], [0, 0], [0, 0]]
  >>> m = make_matrix(4, 2)
  >>> m[1][1] = 7
  >>> m
  [[0, 0], [0, 7], [0, 0], [0, 0]]
"""
matrix = []
for row in range(rows):
    matrix += [[0] * columns]
return matrix

formated printing

items = ['a', 'abcd', 'abcdefg', 'abcdefghijklmn']
for i in items:
    print "Name: %s Price: %s" % (i, i)

for i in items:
    print "Name: %-20s Price: %10.10s" % (i, i)

formated printing:

Name: a                    Price:          a
Name: abcd                 Price:       abcd
Name: abcdefg              Price:    abcdefg
Name: abcdefghijklmn       Price: abcdefghij

read file with while loop

    f = open(file)
    while True:
        l = f.readline()
        print l
        if not l: break
    print "finished.\n"

uniquify a list

elements hashable

alist = list(set(alist))

elements unhashable

alist = [k for k,v in itertools.groupby(sorted(alist))]