【scrapy】FormRequest <TypeError: to_bytes must receive a unicode, str or bytes object, got int>

原因:

formdata的dict中，有value是int.......(有value不是byte类)

 1 class FormRequest(Request):
 2 
 3     def __init__(self, *args, **kwargs):
 4         formdata = kwargs.pop('formdata', None)
 5         if formdata and kwargs.get('method') is None:
 6             kwargs['method'] = 'POST'
 7 
 8         super(FormRequest, self).__init__(*args, **kwargs)
 9 
10         if formdata:
11             items = formdata.items() if isinstance(formdata, dict) else formdata
12             querystr = _urlencode(items, self.encoding)#就这句....
13             if self.method == 'POST':
14                 self.headers.setdefault(b'Content-Type', b'application/x-www-form-urlencoded')
15                 self._set_body(querystr)
16             else:
17                 self._set_url(self.url + ('&' if '?' in self.url else '?') + querystr)

def _urlencode(seq, enc):
    values = [(to_bytes(k, enc), to_bytes(v, enc))
              for k, vs in seq
              for v in (vs if is_listlike(vs) else [vs])]
    return urlencode(values, doseq=1)

def to_bytes(text, encoding=None, errors='strict'):
    """Return the binary representation of `text`. If `text`
    is already a bytes object, return it as-is."""
    if isinstance(text, bytes): #这里FALSE了，raise了TypeError
        return text
    if not isinstance(text, six.string_types):
        raise TypeError('to_bytes must receive a unicode, str or bytes '
                        'object, got %s' % type(text).__name__)
    if encoding is None:
        encoding = 'utf-8'
    return text.encode(encoding, errors)