Exception:
Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\pip\basecommand.py", line 215, in main
    status = self.run(options, args)
  File "C:\Python27\lib\site-packages\pip\commands\install.py", line 324, in run
    requirement_set.prepare_files(finder)
  File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 380, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 620, in _prepare_file
    session=self.session, hashes=hashes)
  File "C:\Python27\lib\site-packages\pip\download.py", line 821, in unpack_url
    hashes=hashes
  File "C:\Python27\lib\site-packages\pip\download.py", line 659, in unpack_http_url
    hashes)
  File "C:\Python27\lib\site-packages\pip\download.py", line 882, in _download_http_url
    _download_url(resp, link, content_file, hashes)
  File "C:\Python27\lib\site-packages\pip\download.py", line 603, in _download_url
    hashes.check_against_chunks(downloaded_chunks)
  File "C:\Python27\lib\site-packages\pip\utils\hashes.py", line 46, in check_against_chunks
    for chunk in chunks:
  File "C:\Python27\lib\site-packages\pip\download.py", line 571, in written_chunks
    for chunk in chunks:
  File "C:\Python27\lib\site-packages\pip\utils\ui.py", line 139, in iter
    for x in it:
  File "C:\Python27\lib\site-packages\pip\download.py", line 560, in resp_read
    decode_content=False):
  File "C:\Python27\lib\site-packages\pip\_vendor\requests\packages\urllib3\response.py", line 357, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "C:\Python27\lib\site-packages\pip\_vendor\requests\packages\urllib3\response.py", line 314, in read
    data = self._fp.read(amt)
  File "C:\Python27\lib\site-packages\pip\_vendor\cachecontrol\filewrapper.py", line 63, in read
    self._close()
  File "C:\Python27\lib\site-packages\pip\_vendor\cachecontrol\filewrapper.py", line 50, in _close
    self.__callback(self.__buf.getvalue())
  File "C:\Python27\lib\site-packages\pip\_vendor\cachecontrol\controller.py", line 275, in cache_response
    self.serializer.dumps(request, response, body=body),
  File "C:\Python27\lib\site-packages\pip\_vendor\cachecontrol\serialize.py", line 55, in dumps
    "body": _b64_encode_bytes(body),
  File "C:\Python27\lib\site-packages\pip\_vendor\cachecontrol\serialize.py", line 12, in _b64_encode_bytes
    return base64.b64encode(b).decode("ascii")

MemoryError

解決方案：使用下面命令：

pip install --no-cache-dir pyspark