Editing file header info in Python

Question

I'm pretty new to python, and I'm trying to edit data in a .mobi file from a Python script. I am able to read all the meta data, but I can't figure out how to save the info I need back into the correct place. Every time I try, it just corrupts the file.

This is a snippet of what I'm having problems with:

    metadata['ASIN'] = "B00012345"
    data += "Modified ASIN: " + metadata['ASIN']

    g = file(infile)
    header2 = g.read(312)

    f = open(infile, 'wb')
    f.seek(header2[0xA4E])
    f.write(metadata['ASIN'])
    f.close()

Can someone tell me what I'm doing wrong?

Thanks

What exactly are you trying to do to the file, are you trying to append some data onto it? Are you trying to insert or overwrite a few bytes in the middle? — tugs
– tugs, Commented Jul 14, 2011 at 22:57

Ignacio Vazquez-Abrams · Accepted Answer · 2011-07-14 22:22:49Z

1

wb (and w) truncates the file on opening. You want rb+.

answered Jul 14, 2011 at 22:22

Ignacio Vazquez-Abrams

804k160 gold badges1.4k silver badges1.4k bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Editing file header info in Python

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related