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
    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

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):