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Sting manipulation

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Join Date: Feb 2008

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dinilkarun dinilkarun is offline

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Sting manipulation

May 21st, 2009

Hi All,

I have the following string:
"AND Category 07|Spec 01|ABC 01 AND Category 07|Spec 02|XYZ 02 AND Category 07|Spec 03|PQR 03 "
It is stored in a string variable. I want to remove only the "ABC 01", "XYZ 02", "PQR 03", etc from the original string. The new string should look something like this:
"AND Category 07|Spec 01 AND Category 07|Spec 02 AND Category 07|Spec 03" .

Please help in doing this. I tried using split and strip functions.. But I am unable to get the correct output.
Any help would be much appreciated!.

Regards,
Dinil

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jlm699

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Re: Sting manipulation

May 21st, 2009

Well it's hard to say without defined rules of what needs to be excluded.

Is it every "|XXX ##" that follows an instance of 'Spec ##' ? If so I would suggest using the re module to come up with a regex. It'll make it super easy to do this quickly, especially if you compile your regex. Here's the documentation, and if you need help generating the regex, post what you have so far and we'll help correct it as you go.

1. Use Code Tags.
2. Homework? Show Effort.
3. Keep discussions on the forum: no PMs

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sneekula

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Re: Sting manipulation

May 21st, 2009

You can use string slicing if you assume a few things:

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
#!/usr/bin/env python
 
# has
old = "AND Category 07|Spec 01|ABC 01 AND Category 07|Spec 02|XYZ 02 \
AND Category 07|Spec 03|PQR 03 "
# wants
new = "AND Category 07|Spec 01 AND Category 07|Spec 02 AND Category 07|Spec 03"
 
# assuming that 'Spec xx' and what you want to remove does not change in length
 
q = old.split('|S')
 
for x in q:
    print(x)  # test
 
print('-'*30)
 
 
new2 = ""
for x in q:
    if x.startswith('pec'):
        # skips the chars from index 6 to 12
        x = '|S' + x[:6] + x[13:]
        print(x)  # test
    new2 += x
 
print('-'*30)
 
print(new2)
 
"""
my result -->
AND Category 07
pec 01|ABC 01 AND Category 07
pec 02|XYZ 02 AND Category 07
pec 03|PQR 03
------------------------------
|Spec 01 AND Category 07
|Spec 02 AND Category 07
|Spec 03
------------------------------
AND Category 07|Spec 01 AND Category 07|Spec 02 AND Category 07|Spec 03
"""
#!/usr/bin/env python

# has
old = "AND Category 07|Spec 01|ABC 01 AND Category 07|Spec 02|XYZ 02 \
AND Category 07|Spec 03|PQR 03 "
# wants
new = "AND Category 07|Spec 01 AND Category 07|Spec 02 AND Category 07|Spec 03"

# assuming that 'Spec xx' and what you want to remove does not change in length

q = old.split('|S')

for x in q:
    print(x)  # test

print('-'*30)


new2 = ""
for x in q:
    if x.startswith('pec'):
        # skips the chars from index 6 to 12
        x = '|S' + x[:6] + x[13:]
        print(x)  # test
    new2 += x

print('-'*30)

print(new2)

"""
my result -->
AND Category 07
pec 01|ABC 01 AND Category 07
pec 02|XYZ 02 AND Category 07
pec 03|PQR 03
------------------------------
|Spec 01 AND Category 07
|Spec 02 AND Category 07
|Spec 03
------------------------------
AND Category 07|Spec 01 AND Category 07|Spec 02 AND Category 07|Spec 03
"""

Last edited by sneekula; May 21st, 2009 at 11:06 am.

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woooee

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Re: Sting manipulation

May 21st, 2009

Another idea. You can also split on the "AND" and then split on "|" removing the [-1] element.

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
test_input = "AND Category 07|Spec 01|ABC 01 AND Category 07|Spec 02|XYZ 02 AND Category 07|Spec 03|PQR 03 "
after_and_split = test_input.split("AND")
print after_and_split
 
new_str = ""
for str in after_and_split:
   after_line_split = str.split("|")
   ## length has to be > 1, otherwise nothing is left after removing -1
   if len(after_line_split) > 1:
      print "     after_line_split", after_line_split
      del after_line_split[-1]
      new_str += "AND" 
      new_str += "|".join(after_line_split) + " "
print new_str 
 
AND Category 07|Spec 01 AND Category 07|Spec 02 AND Category 07|Spec 03
test_input = "AND Category 07|Spec 01|ABC 01 AND Category 07|Spec 02|XYZ 02 AND Category 07|Spec 03|PQR 03 "
after_and_split = test_input.split("AND")
print after_and_split

new_str = ""
for str in after_and_split:
   after_line_split = str.split("|")
   ## length has to be > 1, otherwise nothing is left after removing -1
   if len(after_line_split) > 1:
      print "     after_line_split", after_line_split
      del after_line_split[-1]
      new_str += "AND" 
      new_str += "|".join(after_line_split) + " "
print new_str 

AND Category 07|Spec 01 AND Category 07|Spec 02 AND Category 07|Spec 03

Edit: I hope this isn't homework since it's too late now.

Last edited by woooee; May 21st, 2009 at 4:38 pm.

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The_Kernel The_Kernel is offline

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Re: Sting manipulation

May 21st, 2009

Seems like a good case for a regular expression

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
import re
 
test_input = "AND Category 07|Spec 01|ABC 01 AND Category 07|Spec 02|XYZ 02 AND Category 07|Spec 03|PQR 03 "
test_output = re.sub('\|[A-Z]{3} [0-9]{2}', '', test_input)
import re

test_input = "AND Category 07|Spec 01|ABC 01 AND Category 07|Spec 02|XYZ 02 AND Category 07|Spec 03|PQR 03 "
test_output = re.sub('\|[A-Z]{3} [0-9]{2}', '', test_input)