Abstraction in python

For example, when copying files:

import shutil
shutil.copy('file.txt', 'copy.txt')

It is much more abstract (and simpler) to use the shutil library than:

with open(src, 'rb') as fsrc:
    with open(dst, 'wb') as fdst:
        while True:
            buf = fsrc.read(buf_size)
            if not buf:
                break
            fdst.write(buf)