human
Write me a the Python code 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 code you requested.
    if (b2a_qp is not None):
        data = input.read()
        odata = b2a_qp(data, quotetabs=quotetabs, header=header)
        output.write(odata)
        return
    else:
        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)
        return