[Tutor] String Attribute

[Alan Gauld]

On 02/08/15 02:20, Ltc Hotspot wrote:
> Hi Alan,
>
> I made a mistake and incorrectly assumed that differences between 54 lines
> of output and 27 lines of output is the result of removing duplicate email
> addresses,
>
> Apparently, this is not the case and I was wrong :(
> The solution to the problem is in the  desired line output:
>
> stephen.marquard at uct.ac.za
> louis at media.berkeley.edu
> zqian at umich.edu
> rjlowe at iupui.edu
> zqian at umich.edu
> rjlowe at iupui.edu
...

OK, Only a couple of changes should see to that.

> Latest revised code:
> fname = raw_input("Enter file name: ")
> if len(fname) < 1 : fname = "mbox-short.txt"
> fh = open(fname)
> count = 0
> addresses = set()

change this to use a list

addresses = []

> for line in fh:
>      if line.startswith('From'):
>          line2 = line.strip()
>          line3 = line2.split()
>          line4 = line3[1]
>          addresses.add(line4)

and change this to use the list append() method

addresses.append(line4)

>          count = count + 1
> print addresses
> print "There were", count, "lines in the file with From as the first word"

I'm not quite sure where the 54/27 divergence comes from except that
I noticed Emille mention that there were lines beginning 'From:'
too. If that's the case then follow his advice and change the if
test to only check for 'From ' (with the space).

That should be all you need.

-- 
Alan G
Author of the Learn to Program web site
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