named tuple python iterate

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1>>> a = A(1, 2)
2>>> for name, value in a._asdict().iteritems():
3    print name
4    print value
5
6
7a
81
9b
102
11
12>>> for fld in a._fields:
13    print fld
14    print getattr(a, fld)
15
16
17a
181
19b
202
21

1You could google on "tuple unpacking". This can be used in various places in Python. The simplest is in assignment
2
3>>> x = (1,2)
4>>> a, b = x
5>>> a
61
7>>> b
82
9In a for loop it works similarly. If each element of the iterable is a tuple, then you can specify two variables and each element in the loop will be unpacked to the two.
10
11>>> x = [(1,2), (3,4), (5,6)]
12>>> for item in x:
13...     print "A tuple", item
14A tuple (1, 2)
15A tuple (3, 4)
16A tuple (5, 6)
17>>> for a, b in x:
18...     print "First", a, "then", b
19First 1 then 2
20First 3 then 4
21First 5 then 6
22The enumerate function creates an iterable of tuples, so it can be used this way.

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