A piece of code that copies the first line from file A into file B. Used to copy CSV headerss

copy-headers.py

# We take CSV headers from this file...
src_file = "source.csv"

# ...and add to this file as the first line
dst_file = "destination.csv"

# Output file that's created (to avoid possibly damaging the destination file)
output_file = "output.csv"


# Read the first line from source and add to output
headers = open(src_file, 'r').readline()

fd = open(output_file, 'w')
fd.write(headers)

# Copy destination file into output line-by-line (to avoid reading large files into RAM)
for line in open(dst_file, 'r'):
    fd.write(line)

fd.close()