import requests
r = requests.session()

empinfo = {'color':'#000000','usr_id':'0',
'login':'placeholder','password':'passw','password1':'passw',
'sname':'surname','fname':'firstname','pname':'middlename',
'bdate_dd':'01','bdate_mm':'01','bdate_yy':'1970',
'ref_id':'0','dept':'','tasks':'',
'phone_i':'','phone_e':'','email_e':'',
'ho_text':'','sh_text':'',
'pos':'position','res_id':'0',
'sdate_dd':'01','sdate_mm':'07','sdate_yy':'2013',
'alt':'','grp_id':'0','enable':'1'}

r.post('http://requestb.in/1dpgypo1', files=empinfo)

#Result: http://requestb.in/1dpgypo1?inspect#1c2ogn
#Notice the unwanted filename and Content-Type statements.
#Content-Disposition: form-data; name="enable"; filename="enable"
#Content-Type: application/octet-stream
#...