How to find and remove all required lines in python?

Question

Python

There are many links in the file.
How to run through the file and delete everything that starts with http or https until the end of the url and no more? Without using an additional file.
I know how to do it in bash but not in python.
Tried like this:

for files in what_in_dir:
    o = open(i,'a')
    data = open(i).read()
    o.write( re.sub(r'^http://*$','',data)  )
    o.close()

did not help

Answer 1

clean_list = []
with open('input.txt', 'r', encoding="utf-8") as f_input:
    for l in f_input:
        if not l.startswith('http'):
            clean_list.append(l)

with open('input.txt', 'w', encoding="utf-8") as f_out:
    f_out.write('\n'.join(clean_list))