human
I wrote the below code

    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)

What's a good function header?

Here's a good function header?
assistant
#Here's a good function header.

def encode(input, output, quotetabs, header=0):