<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def create_silence(length):
 """Create a piece of silence."""

    data = bytearray(length)
    i = 0
    while i < length:
        data[i] = 128
        i += 1
    return data