human
What is a the Python program you requested given the following:
Complete the below
def encode(input, output, quotetabs, header=0):

    ''''Read \'input\', apply quoted-printable encoding, and write to \'output\'.
    \'input\' and \'output\' are files with readline() and write() methods.
    The \'quotetabs\' flag indicates whether embedded tabs and spaces should be
    quoted.  Note that line-ending tabs and spaces are always encoded, as per
    RFC 1521.
    The \'header\' flag indicates whether we are encoding spaces as _ as per
    RFC 1522.'
    '''
assistant
#Here is the Python program you requested.
    if (b2a_qp is not None):
        data = input.read()
        odata = b2a_qp(data, quotetabs=quotetabs, header=header)
        output.write(odata)
        return
    def write(s, output=output, lineEnd='\n'):
        if (s and (s[(-1):] in '     DCTB ')):
            output.write(((s[:(-1)] + quote(s[(-1)])) + lineEnd))
        elif (s == '.'):
            output.write((quote(s) + lineEnd))
        else:
            output.write((s + lineEnd))
    prevline = None
    while 1:
        line = input.readline()
        if (not line):
            break
        outline = []
        stripped = ''
        if (line[(-1):] == '\n'):
            line = line[:(-1)]
            stripped = '\n'
        for c in line:
            if needsquoting(c, quotetabs, header):
                c = quote(c)
            if (header and (c == '    ')):
                outline.append('_')
            else:
                outline.append(c)
        if (prevline is not None):
            write(prevline)
        thisline = EMPTYSTRING.join(outline)
        while (len(thisline) > MAXLINESIZE):
            write(thisline[:(MAXLINESIZE - 1)], lineEnd='=\n')
            thisline = thisline[(MAXLINESIZE - 1):]
        prevline = thisline
    if (prevline is not None):
        write(prevline, lineEnd=stripped)