def prepend_line ( filepath , line ) : with open ( filepath ) as f : lines = f . readlines ( ) lines . insert ( 0 , line ) with open ( filepath , 'w' ) as f : f . writelines ( lines )
append to end of line in file python
Rewrite a file adding a line to its beginning .
def prepend_line(filepath, line):
    """Rewrite a file adding a line to its beginning.
    """
    with open(filepath) as f:
        lines = f.readlines()

    lines.insert(0, line)

    with open(filepath, 'w') as f:
        f.writelines(lines)