Python write line to beginning of file

How can I write a line to beginning of a file?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

The only way is to write the modified content again. The easy but slightly dangerous way to rewrite the same file with the modified content. Try:
fname = 'myfile.txt'

# Open the file for reading and read all lines into memory.
f = open(fname)
content = f.readlines()

# Modify the content arbitrarily.  Here the new first line is inserted
# as the first line.
content.insert(0, 'inserted new first line\n')

# Join the lines from the list and write the resulting string 
# to the same file now opened for writing.
f = open(fname, 'w')

Open in new window


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.