How to use 'python requests multipart form data' in Python

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def encode_multipart(data, charset='utf-8'):
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    # Ported from Werkzeug testing.
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    boundary = '---------------Boundary%s' % uuid4().hex
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    body = BytesIO()
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    def write(string):
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        body.write(string.encode(charset))
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    if isinstance(data, dict):
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        data = data.items()
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    for key, values in data:
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        if not isinstance(values, (list, tuple)):
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            values = [values]
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        for value in values:
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            write('--%s\r\nContent-Disposition: form-data; name="%s"' %
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                  (boundary, key))
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            reader = getattr(value, 'read', None)
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            if reader is not None:
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                filename = getattr(value, 'filename',
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                                   getattr(value, 'name', None))
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                content_type = getattr(value, 'content_type', None)
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                if content_type is None:
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                    content_type = filename and \
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                        mimetypes.guess_type(filename)[0] or \
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                        'application/octet-stream'
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                if filename is not None:
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                    write('; filename="%s"\r\n' % filename)
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                else:
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                    write('\r\n')
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                write('Content-Type: %s\r\n\r\n' % content_type)
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                while 1:
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                    chunk = reader(16384)
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                    if not chunk:
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                        break
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                    body.write(chunk)
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            else:
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                if not isinstance(value, str):
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                    value = str(value)
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                else:
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                    value = value.encode(charset)
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                write('\r\n\r\n')
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                body.write(value)
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            write('\r\n')
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    write('--%s--\r\n' % boundary)
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    body.seek(0)
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    content_type = 'multipart/form-data; boundary=%s' % boundary
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    return body.read(), content_type