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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _encode_buffer(string, f):
 	"""Writes the bencoded form of the input string or bytes"""

	if isinstance(string, str):
		string = string.encode()
	f.write(str(len(string)).encode())
	f.write(_TYPE_SEP)
	f.write(string)