[Tutor] a quick Q: how to use for loop to read a series of files with .doc end

[lina]

On Thu, Oct 6, 2011 at 4:33 AM, Prasad, Ramit <ramit.prasad at jpmorgan.com>wrote:

> >>yes, you're iterating over the keys of a dictionary.  Since it only has
> the key "E", that's what you get.  Try printing dir(results) to see what
> methods might return something other than the key.  Make the language work
> for you.
>
> >Sorry I am not smart.  value?
>
> Dictionaries {} are containers for key/value based pairs like { key :
> value, another_key : value(can be same or repeated) }
>
> For example:
> {'B': [0, 0, 0, 0, 0, 0], 'E': [2, 1, 4, 0, 1, 0]}
> The keys here are 'B' and 'E'. The values here are [0, 0, 0, 0, 0, 0] (for
> key 'B') and [2, 1, 4, 0, 1, 0] (for key 'E')
>
> You can get the value of a dictionary by doing: value = dictionary[key]
> You can set the value of a dictionary by doing: dictionary[key] = value
>
> You will get an exception if you try to get a value for a key that is not
> in the dictionary.
> >>> dictionary = {'B': [0, 0, 0, 0, 0, 0], 'E': [2, 1, 4, 0, 1, 0]}
> >>> dictionary['F']
> KeyError: 'F'
>
> You can iterate over dictionaries in a couple ways
> 1-
> for key in dictionary: # also the same as
>                      # for key in dictionary.keys()
>    value = dictionary[ key ]
> 2-
> for key, value in dictionary.iteritems():
>    < do something here with >
>
Now finally figure out what's the string, list and dictionary.
May I ask a further question:

>>> a
{'B': [4, 5, 6], 'E': {1, 2, 3}}

How can I get the value of
set(a['E'])+set(a['B'])

I mean, get a new dict 'B+E':[5,7,9]

Thanks,






>
>
>
> Ramit
>
>
> Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
> 712 Main Street | Houston, TX 77002
> work phone: 713 - 216 - 5423
>
>
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-- 
Best Regards,

lina
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