[Tutor] Dictionary Issue

[Ltc Hotspot]

Mark,

Replace  count[address]= count.get(address,0) +1 with  c =
Counter(['address'])?

Regards,
Hal

On Wed, Aug 5, 2015 at 9:03 PM, Mark Lawrence <breamoreboy at yahoo.co.uk>
wrote:

> On 05/08/2015 23:58, Ltc Hotspot wrote:
>
>> Hi Mark,
>>
>> Address identifies the email address with the maximum  number of sends:
>> cwen at iupui.edu.
>>
>> Secondly, we are missing a count on the number of messages sent by
>> cwen at iupui.edu, i.e., 5.
>>
>> Thirdly, maxval 'none' is not defined on line # 24
>>
>> Questions: How do we define the value of none for the key maxval and
>> retrieve a number count on the number of messages sent by cwen at iupui.edu.
>>
>>
>> NameError:
>>
>> Traceback (most recent call last)
>> C:\Users\vm\Desktop\apps\docs\Python\assignment_9_4_5.py in <module>()
>>       22 ## find the greatest number of mail messages.
>>       23
>> ---> 24 maxval = none
>>       25 maxkee = none
>>       26 for kee, val in count.items():
>>
>> NameError: name 'none' is not defined
>>
>> In [52]: print address
>> cwen at iupui.edu
>>
>> Revised data:
>>
>>
>> ## The program looks for 'From ' lines and takes the second
>> ## word of those lines as the person who sent the mail.
>>
>> fname = raw_input("Enter file name: ")
>> handle = open (fname, 'r')
>> for line in handle:
>>      if line.startswith("From: "):
>>          address = line.split()[1]
>>
>>
>> ## The program creates a Python dictionary that maps
>> ## the sender's mail address to a count of the number
>> ## of times they appear in the file.
>>
>>          count = dict()
>>          for wrd in address:
>>              count[wrd]= count.get(wrd,0) +1
>>
>> ## After the dictionary is produced, the program reads
>> ## through the dictionary using a maximum loop to
>> ## find the greatest number of mail messages.
>>
>> maxval = none
>> maxkee = none
>> for kee, val in count.items():
>>      if maxval == none or maxval <val:
>>          maxval = val
>>          maxkee = kee
>>
>>
> You can greatly simplify all of the above code if you use a Counter from
> the collections module
> https://docs.python.org/3/library/collections.html#collections.Counter
>
> --
> My fellow Pythonistas, ask not what our language can do for you, ask
> what you can do for our language.
>
> Mark Lawrence
>
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