Python

lines = ['line1', 'line2']
with open('filename.txt', 'w') as f:
    f.writelines("%s
" % l for l in lines)

new_line = "This new line will be added.
"

with open("sample.txt", "a") as a_file:
  a_file.write("
")
  a_file.write(new_line)

fw.write('
'.join(line_list) + '
')

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