Dear Sir,
Thank you for your kind reply. I would surely check your code. Meanwhile, I
solved it using readlines() but not in your way. I will definitely have a
look in your code. My solution came so smart that I felt I should not have
posted this question.
But I would like to know about,
i) Fileinput.
ii) Ast.
And one small question does Python has any increment operator like ++ in C.
Thank you for taking out the time to write answer for me.
Wishing you a happy day ahead,
Best Regards,
Subhabrata.
On Fri, Sep 4, 2009 at 8:43 PM, Lucas Prado Melo <lukepada...@gmail.com>wrote:
> On Fri, Sep 4, 2009 at 9:50 AM, joy99 <subhakolkata1...@gmail.com> wrote:
>
>> Dear Group,
>>
>> I have a file. The file has multiple lines. I want to get the line
>> number of any one of the strings.
>> Once I get that I like to increment the line number and see the string
>> of the immediate next line or any following line as output. The
>> problem as I see is nicely handled in list,
>>
>
> You could just grab each line and associate that line's content with its
> line numbers, like this:
> f = open("my_file.txt", "r")
> line2pos = {}
> for line_num, line in enumerate(f.readlines()):
> if line not in line2pos:
> line2pos[line] = []
> line2pos[line].append(line_num)
> (...)
>
> This approach would be nice when you don't know which string to look for
> beforehand.
> In the case you already know it, there's no need for keeping the line2pos
> variable, the right approach should be to iterate through the lines of the
> file and, when you see the string you need, just display the next line and
> exit:
> def lookNextLineAfterString(s)
> f = open("my_file.txt", "r")
> found = False
> while True:
> line = f.readline()
> if line == '':
> break
> line = line[:-1] #stripping the newline
> if line == s:
> found = True
> break
> if found == True:
> nextString = f.readline()
> if nextString == '':
> print "String found but there's no next string"
> else:
> print "Next string is ", nextString[:-1]
> else:
> print "String not found"
>
--
http://mail.python.org/mailman/listinfo/python-list
