projects / OpenSPARC-T2-DV / blame
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| 54 | ||
| 55 | <H2><A NAME="SECTION0071620000000000000000"></A><A NAME="itertools-example"></A> | |
| 56 | <BR> | |
| 57 | 5.16.2 Examples | |
| 58 | </H2> | |
| 59 | ||
| 60 | <P> | |
| 61 | The following examples show common uses for each tool and | |
| 62 | demonstrate ways they can be combined. | |
| 63 | ||
| 64 | <P> | |
| 65 | <div class="verbatim"><pre> | |
| 66 | >>> amounts = [120.15, 764.05, 823.14] | |
| 67 | >>> for checknum, amount in izip(count(1200), amounts): | |
| 68 | ... print 'Check %d is for $%.2f' % (checknum, amount) | |
| 69 | ... | |
| 70 | Check 1200 is for $120.15 | |
| 71 | Check 1201 is for $764.05 | |
| 72 | Check 1202 is for $823.14 | |
| 73 | ||
| 74 | >>> import operator | |
| 75 | >>> for cube in imap(operator.pow, xrange(1,5), repeat(3)): | |
| 76 | ... print cube | |
| 77 | ... | |
| 78 | 1 | |
| 79 | 8 | |
| 80 | 27 | |
| 81 | 64 | |
| 82 | ||
| 83 | >>> reportlines = ['EuroPython', 'Roster', '', 'alex', '', 'laura', | |
| 84 | '', 'martin', '', 'walter', '', 'mark'] | |
| 85 | >>> for name in islice(reportlines, 3, None, 2): | |
| 86 | ... print name.title() | |
| 87 | ... | |
| 88 | Alex | |
| 89 | Laura | |
| 90 | Martin | |
| 91 | Walter | |
| 92 | Mark | |
| 93 | ||
| 94 | # Show a dictionary sorted and grouped by value | |
| 95 | >>> from operator import itemgetter | |
| 96 | >>> d = dict(a=1, b=2, c=1, d=2, e=1, f=2, g=3) | |
| 97 | >>> di = sorted(d.iteritems(), key=itemgetter(1)) | |
| 98 | >>> for k, g in groupby(di, key=itemgetter(1)): | |
| 99 | ... print k, map(itemgetter(0), g) | |
| 100 | ... | |
| 101 | 1 ['a', 'c', 'e'] | |
| 102 | 2 ['b', 'd', 'f'] | |
| 103 | 3 ['g'] | |
| 104 | ||
| 105 | # Find runs of consecutive numbers using groupby. The key to the solution | |
| 106 | # is differencing with a range so that consecutive numbers all appear in | |
| 107 | # same group. | |
| 108 | >>> data = [ 1, 4,5,6, 10, 15,16,17,18, 22, 25,26,27,28] | |
| 109 | >>> for k, g in groupby(enumerate(data), lambda (i,x):i-x): | |
| 110 | ... print map(operator.itemgetter(1), g) | |
| 111 | ... | |
| 112 | [1] | |
| 113 | [4, 5, 6] | |
| 114 | [10] | |
| 115 | [15, 16, 17, 18] | |
| 116 | [22] | |
| 117 | [25, 26, 27, 28] | |
| 118 | </pre></div> | |
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