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up vote -1 down vote favorite

please help me to parsing data in two-dimensional array in python. The value massive and dictionary inside example change every time when script run, so length massive don't do constanta.

example data:

[[{u'itemid': u'23296', u'ns': u'733098943', u'value': u'0.0000', u'clock': u'1413386116'}, 
{u'itemid': u'23296', u'ns': u'774481389', u'value': u'0.0000', u'clock': u'1413386176'}], 
[{u'itemid': u'23297', u'ns': u'735958009', u'value': u'0.0100', u'clock': u'1413386117'}, 
{u'itemid': u'23297', u'ns': u'776151521', u'value': u'0.0100', u'clock': u'1413386177'}], 
[{u'itemid': u'23295', u'ns': u'731054106', u'value': u'0.0500', u'clock': u'1413386115'}, 
{u'itemid': u'23295', u'ns': u'772822468', u'value': u'0.0500', u'clock': u'1413386175'}]]

example needed output:

[[0.0000, 0.0000], [0.0100, 0.0100], [0.0500, 0.0500]]

Please help

share|improve this question
1  
what did you try so far? –  unixer 20 hours ago
    
dimension of the array varies depending on the number of elements (in the example of the number itemid) –  somethings went wrong 20 hours ago
1  
Please post your code... –  bruno desthuilliers 20 hours ago

2 Answers 2

up vote 0 down vote accepted

you could use list comprehensions for that

>>> els = [[{u'itemid': u'23296', u'ns': u'733098943', u'value': u'0.0000', u'clock': u'1413386116'}, 
{u'itemid': u'23296', u'ns': u'774481389', u'value': u'0.0000', u'clock': u'1413386176'}], 
[{u'itemid': u'23297', u'ns': u'735958009', u'value': u'0.0100', u'clock': u'1413386117'}, 
{u'itemid': u'23297', u'ns': u'776151521', u'value': u'0.0100', u'clock': u'1413386177'}], 
[{u'itemid': u'23295', u'ns': u'731054106', u'value': u'0.0500', u'clock': u'1413386115'}, 
{u'itemid': u'23295', u'ns': u'772822468', u'value': u'0.0500', u'clock': u'1413386175'}]]

>>> ls = [[dict_["value"] for dict_ in sub_lists] for sub_lists in els]
>>> print ls
[[u'0.0000', u'0.0000'], [u'0.0100', u'0.0100'], [u'0.0500', u'0.0500']]
share|improve this answer
    
NameError: global name 'sub_list' is not defined –  somethings went wrong 20 hours ago
    
I fixed the typo –  greole 20 hours ago
    
Thanks!!! really you help me!! thanks!! –  somethings went wrong 20 hours ago
up vote 0 down vote

try this:

a = [[{u'itemid': u'23296', u'ns': u'733098943', u'valk': u'1413386116'}, 
{u'itemid': u'23296', u'ns': u'774481389', u'value': u1413386176'}], 
[{u'itemid': u'23297', u'ns': u'735958009', u'value': '1413386117'}, 
{u'itemid': u'23297', u'ns': u'776151521', u'value': u1413386177'}], 
[{u'itemid': u'23295', u'ns': u'731054106', u'value': '1413386115'}, 
{u'itemid': u'23295', u'ns': u'772822468', u'value': u1413386175'}]]

print [[x['value'] for y in a] for x in y]
share|improve this answer
    
UnboundLocalError: local variable 'y' referenced before assignment –  somethings went wrong 20 hours ago

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