Es ist ein alter Thread, aber immer noch ein beliebter ein, also hier ist mein Beitrag nur mit Standardmodulen.
Die Idee ist die gleiche als here, aber unterstützen Python 2.x und Python 3.x. Es hat auch einen Body-Generator, um unnötigen Speicherverbrauch zu vermeiden.
import codecs
import mimetypes
import sys
import uuid
try:
import io
except ImportError:
pass # io is requiered in python3 but not available in python2
class MultipartFormdataEncoder(object):
def __init__(self):
self.boundary = uuid.uuid4().hex
self.content_type = 'multipart/form-data; boundary={}'.format(self.boundary)
@classmethod
def u(cls, s):
if sys.hexversion < 0x03000000 and isinstance(s, str):
s = s.decode('utf-8')
if sys.hexversion >= 0x03000000 and isinstance(s, bytes):
s = s.decode('utf-8')
return s
def iter(self, fields, files):
"""
fields is a sequence of (name, value) elements for regular form fields.
files is a sequence of (name, filename, file-type) elements for data to be uploaded as files
Yield body's chunk as bytes
"""
encoder = codecs.getencoder('utf-8')
for (key, value) in fields:
key = self.u(key)
yield encoder('--{}\r\n'.format(self.boundary))
yield encoder(self.u('Content-Disposition: form-data; name="{}"\r\n').format(key))
yield encoder('\r\n')
if isinstance(value, int) or isinstance(value, float):
value = str(value)
yield encoder(self.u(value))
yield encoder('\r\n')
for (key, filename, fd) in files:
key = self.u(key)
filename = self.u(filename)
yield encoder('--{}\r\n'.format(self.boundary))
yield encoder(self.u('Content-Disposition: form-data; name="{}"; filename="{}"\r\n').format(key, filename))
yield encoder('Content-Type: {}\r\n'.format(mimetypes.guess_type(filename)[0] or 'application/octet-stream'))
yield encoder('\r\n')
with fd:
buff = fd.read()
yield (buff, len(buff))
yield encoder('\r\n')
yield encoder('--{}--\r\n'.format(self.boundary))
def encode(self, fields, files):
body = io.BytesIO()
for chunk, chunk_len in self.iter(fields, files):
body.write(chunk)
return self.content_type, body.getvalue()
Demo
# some utf8 key/value pairs
fields = [('প্রায়', 42), ('bar', b'23'), ('foo', 'ން:')]
files = [('myfile', 'image.jpg', open('image.jpg', 'rb'))]
# iterate and write chunk in a socket
content_type, body = MultipartFormdataEncoder().encode(fields, files)
schließlich eine Lösung, die nur für Python 3 mit der Standardbibliothek arbeitet. –