Writing hex numbers to a file in Python

Question

The below code is reading a file called ‘test.txt’ which has hex numbers. The below code is converting these hex number into decimal numbers. How can I write the decimal number to a file instead of printing it out?

my code

file= 'test.txt'

with open(file) as fp:
   line = fp.readline()
   cnt = 1
   while line:
       i = int(line, 16)
       print(str(i))
       line = fp.readline()
       cnt += 1

I wonder who thought that removing code from the question was funny. — bereal, Nov 20 '18 at 14:32

kalehmann · Answer 1 · 2018-10-10T09:46:12.307

0

Actually the built in print function has a file keyword argument. You can use this to redirect your output to a file of your choice.

input_file = 'test.txt'
output_file = 'out.txt'

with open(input_file, 'r') as fp:
    with open(output_file, 'w') as out_fp:
        line = fp.readline()
        cnt = 1
        while line:
            i = int(line, 16)
            print(str(i), file=out_fp)
            line = fp.readline()
            cnt += 1

Assuming you have test.txt with the following content:

ff
10

Then out.txt will contain:

255
16

As of python 2.7 or python 3.1 you can even combine those two with statements

...
with open(input_file, 'r') as fp, open(output_file, 'w') as out_fp:
    ...

edited Oct 10 '18 at 09:46

answered Oct 10 '18 at 09:24

kalehmann

4,821
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you able to show me with using my code above please? – rich dave Oct 10 '18 at 09:26
Yes, I have updated my answer assuming you want to write your output to a different file. – kalehmann Oct 10 '18 at 09:29

score 0 · Answer 2 · answered Oct 10 '18 at 09:26

0

 fp = open("file.txt", "w")
 fp.write("your data")

should work.

answered Oct 10 '18 at 09:26

bakarin

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you able to show me using your code with mine? not sure if i am placing your code in the right place. – rich dave Oct 10 '18 at 09:30

Writing hex numbers to a file in Python

2 Answers2