Question

QUESTION: HOW OVERWRITE A LINE IN A FILE AFTER READING THE LINE?

By NOT making a new file, or reading the hole file, since the file has 123.500 lines.

for line in source:

    newline = "+" + line

    #write over the line in the file with newline

line = “HAHA”,
newline = “+HAHA”

How can i replace the newline with the line, in the file?

Answer 1

Either

• write to a different file, line by line, or
• read the whole file in memory and replace the original with a new file you write.

The fileinput module can assist you with this, as demonstrated in this answer