Text processing using python

Question

This is the sample file, I would like to check if "field5" exists in file, if exists check if 67890 exits, if exists then print corresponding values for "field5"

sample output:

START
field1
field2
field3
field4
field5
field6
END

12345|5|1|2|3|4|111|555
67890|5|6|7|8|9|112|000

You seem to be missing some python code in your question. If you have some, even if wrong, please edit the question to include it — OneCricketeer
– OneCricketeer, Commented Jul 30, 2017 at 23:16

gribvirus74 · Accepted Answer · 2017-07-30 23:11:18Z

1

Finding content in file you can achieve by looping over its lines like so:

def process_text():
    f = open('filename.txt')
    for line in f:
        if 'field5' in line:
            break
    else: return
    f.seek(0) # get back to the begining of the file (if you want to)
    for line in f:
        if '67890' in line:
            numbers = line.split(sep='|') # getting the list that contains the numbers
    else: return

    print(numbers[-1]) # print the last element

NOTE: This is python3.5.2. In python 2.7 split method should look like this: line.split('|') (without keywords).

edited Jul 30, 2017 at 23:11

answered Jul 30, 2017 at 23:01

gribvirus74

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4 Comments

Maddy M Over a year ago

Hi, I forgot to mention, if this a position based on above? if we have field6.

gribvirus74 Over a year ago

Position of what, 67890 or the numbers after?

Maddy M Over a year ago

Hi, Lets say field5 exists, then 112 is the value corresponding to field5 when you line starting with 67890 in the first column. 67890|5|6|7|8|9|112|000

gribvirus74 Over a year ago

Then you have to change the last line to print(numbers[1+5]), because print(numbers[-1]) means that you're gonna print the last number.

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