Hi Alan,
Question1: Why did the following strip function fail: line2 =
line.strip (',')
View instructions for 'str.strip([*chars*])¶
<https://docs.python.org/2.7/library/stdtypes.html?highlight=strip#str.strip>'
which is available at
https://docs.pythonorg/2.7/library/stdtypes.html?highlight=strip#str.strip
Question2: How do I code a vertical column output
Revised code:
fname = raw_input("Enter file name: ")
if len(fname) < 1 : fname = "mbox-short.txt"
fh = open(fname)
count = 0
addresses =[]
for line in fh:
if line.startswith('From'):
line2 = line.strip ()
line3 = line2.split()
line4 = line3[1]
addresses.append(line4)
count = count + 1
print addresses
print "There were", count, "lines in the file with From as the first word"
Produced output:
['stephen.marqu...@uct.ac.za', 'stephen.marqu...@uct.ac.za', '
lo...@media.berkeley.edu', 'lo...@media.berkeley.edu', 'zq...@umich.edu', '
zq...@umich.edu', 'rjl...@iupui.edu', 'rjl...@iupui.edu', 'zq...@umich.edu',
'zq...@umich.edu', 'rjl...@iupui.edu', 'rjl...@iupui.edu', 'c...@iupui.edu',
'c...@iupui.edu', 'c...@iupui.edu', 'c...@iupui.edu', 'gsil...@umich.edu', '
gsil...@umich.edu', 'gsil...@umich.edu', 'gsil...@umich.edu', '
zq...@umich.edu', 'zq...@umich.edu', 'gsil...@umich.edu', 'gsil...@umich.edu',
'wagne...@iupui.edu', 'wagne...@iupui.edu', 'zq...@umich.edu', '
zq...@umich.edu', 'antra...@caret.cam.ac.uk', 'antra...@caret.cam.ac.uk', '
gopal.ramasammyc...@gmail.com', 'gopal.ramasammyc...@gmail.com', '
david.horw...@uct.ac.za', 'david.horw...@uct.ac.za', '
david.horw...@uct.ac.za', 'david.horw...@uct.ac.za', '
david.horw...@uct.ac.za', 'david.horw...@uct.ac.za', '
david.horw...@uct.ac.za', 'david.horw...@uct.ac.za', '
stephen.marqu...@uct.ac.za', 'stephen.marqu...@uct.ac.za', '
lo...@media.berkeley.edu', 'lo...@media.berkeley.edu', '
lo...@media.berkeley.edu', 'lo...@media.berkeley.edu', '
r...@media.berkeley.edu', 'r...@media.berkeley.edu', 'c...@iupui.edu', '
c...@iupui.edu', 'c...@iupui.edu', 'c...@iupui.edu', 'c...@iupui.edu', '
c...@iupui.edu'] ← Mismatch
There were 54 lines in the file with From as the first word
Desired output:
stephen.marqu...@uct.ac.za
lo...@media.berkeley.edu
zq...@umich.edu
rjl...@iupui.edu
zq...@umich.edu
rjl...@iupui.edu
c...@iupui.edu
c...@iupui.edu
gsil...@umich.edu
gsil...@umich.edu
zq...@umich.edu
gsil...@umich.edu
wagne...@iupui.edu
zq...@umich.edu
antra...@caret.cam.ac.uk
gopal.ramasammyc...@gmail.com
david.horw...@uct.ac.za
david.horw...@uct.ac.za
david.horw...@uct.ac.za
david.horw...@uct.ac.za
stephen.marqu...@uct.ac.za
lo...@media.berkeley.edu
lo...@media.berkeley.edu
r...@media.berkeley.edu
c...@iupui.edu
c...@iupui.edu
c...@iupui.edu
There were 27 lines in the file with From as the first word
Regards,
Hal
On Sun, Aug 2, 2015 at 1:18 AM, Alan Gauld <alan.ga...@btinternet.com>
wrote:
> 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.marqu...@uct.ac.za
>> lo...@media.berkeley.edu
>> zq...@umich.edu
>> rjl...@iupui.edu
>> zq...@umich.edu
>> rjl...@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
> http://www.alan-g.me.uk/
> http://www.amazon.com/author/alan_gauld
> Follow my photo-blog on Flickr at:
> http://www.flickr.com/photos/alangauldphotos
>
>
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