Storing selected portion from the string in Variables in Python

Question

I have a variable Field in which a string is store like this:

Field= "In Field 'fieldname':(Value1) has changed from (1) to (2)"

From this string stored in variable Field, I want to catch the values (1) and (2) in two different varibales like:

OldValue=1
NewValue=2

Can someone please help me here? I am handling this variables in Python

Tagging python is fine, but tagging both python2.7 and python-3x doesn't make sense, which one are you using? — jamylak
– jamylak, Commented Apr 21, 2013 at 10:33

jamylak · Accepted Answer · 2013-04-21 10:36:45Z

2

This finds digits surrounded by brackets:

>>> import re
>>> Field= "In Field 'fieldname':(Value1) has changed from (1) to (2)"
>>> OldValue, NewValue = map(int, re.findall(r'\((\d+)\)', Field))
>>> OldValue
1
>>> NewValue
2

You may not only have two values, in which case

vals = list(map(int, re.findall(r'\((\d+)\)', Field)))

will do the trick

edited Apr 21, 2013 at 10:36

answered Apr 21, 2013 at 10:29

jamylak

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9 Comments

hulk007 Over a year ago

What changes I have to do if I want to catch: name=fieldname

jamylak Over a year ago

Do you want to catch :? Like :(Value1) as well as the (1) (2)?

hulk007 Over a year ago

Also your trick works if a I have int values, suppose if old value and new value is not int, then what will be the changes?

hulk007 Over a year ago

No I want to cath in name = filedname and change values(also if they are not of type int)

jamylak Over a year ago

@hulk007 If they aren't int, re.findall(r'\((\d+)\)', Field) alone, returns them as strings

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