pip下載到本地後切換到下載目錄再安裝，小事，但是這樣的包多了，很繁瑣！
pip install piptestfile-1.1.0b0-py2.py3-none-any.whl（.whl安裝包名稱）
這裏有個小竅門：只輸入前面一部分，例如輸入上圖文件名中的開頭字母T，然後按Tab鍵，後面部分會自動補全
後記：
最近網絡抽風嚴重，一個幾十K的東西，費老半天裝不上去，只好下載後再pip, 下面這個例子是升級gluon-cv的全過程，直接使用
pip install --upgrade gluoncv 就別說了，根本裝不上去，所以只好到這裏（https://pypi.org/project/gluoncv/#files）把文件包下載下來，具體下載地址是：https://files.pythonhosted.org/packages/fa/81/37a00609cb53da3671adb106b9bc03fb1c029ad5a8db4bc668283e65703d/gluoncv-0.7.0-py2.py3-none-any.whl
然後再切換到下載目錄下安裝，如下
(mxnet36) H:\>cd H:\down_pipwheels
(mxnet36) H:\down_pipwheels>pip install gluoncv-0.7.0-py2.py3-none-any.whl --upgrade
Processing h:\down_pipwheels\gluoncv-0.7.0-py2.py3-none-any.whl
Requirement already satisfied, skipping upgrade: matplotlib in d:\anaconda3\envs\mx36\lib\site-packages (from gluoncv==0.7.0) (3.1.1)
Collecting portalocker (from gluoncv==0.7.0)
Downloading https://files.pythonhosted.org/packages/53/84/7b3146ec6378d28abc73ab484f09f47dfa008ad6f03f33d90a369f880e25/portalocker-1.7.0-py2.py3-none-any.whl
Requirement already satisfied, skipping upgrade: numpy in d:\anaconda3\envs\mx36\lib\site-packages (from gluoncv==0.7.0) (1.16.5)
Requirement already satisfied, skipping upgrade: tqdm in d:\anaconda3\envs\mx36\lib\site-packages (from gluoncv==0.7.0) (4.36.1)
Requirement already satisfied, skipping upgrade: Pillow in d:\anaconda3\envs\mx36\lib\site-packages (from gluoncv==0.7.0) (6.2.0)
Requirement already satisfied, skipping upgrade: scipy in d:\anaconda3\envs\mx36\lib\site-packages (from gluoncv==0.7.0) (1.3.1)
Requirement already satisfied, skipping upgrade: requests in d:\anaconda3\envs\mx36\lib\site-packages (from gluoncv==0.7.0) (2.22.0)
Requirement already satisfied, skipping upgrade: pyparsing!=2.0.4,!=2.1.2,!=2.1.6,>=2.0.1 in d:\anaconda3\envs\mx36\lib\site-packages (from matplotlib->gluoncv==0.7.0) (2.4.5)
Requirement already satisfied, skipping upgrade: python-dateutil>=2.1 in d:\anaconda3\envs\mx36\lib\site-packages (from matplotlib->gluoncv==0.7.0) (2.8.1)
Requirement already satisfied, skipping upgrade: cycler>=0.10 in d:\anaconda3\envs\mx36\lib\site-packages (from matplotlib->gluoncv==0.7.0) (0.10.0)
Requirement already satisfied, skipping upgrade: kiwisolver>=1.0.1 in d:\anaconda3\envs\mx36\lib\site-packages (from matplotlib->gluoncv==0.7.0) (1.1.0)
Requirement already satisfied, skipping upgrade: pywin32!=226; platform_system == "Windows" in d:\anaconda3\envs\mx36\lib\site-packages (from portalocker->gluoncv==0.7.0) (223)
Requirement already satisfied, skipping upgrade: chardet<3.1.0,>=3.0.2 in d:\anaconda3\envs\mx36\lib\site-packages (from requests->gluoncv==0.7.0) (3.0.4)
Requirement already satisfied, skipping upgrade: idna<2.9,>=2.5 in d:\anaconda3\envs\mx36\lib\site-packages (from requests->gluoncv==0.7.0) (2.8)
Requirement already satisfied, skipping upgrade: certifi>=2017.4.17 in d:\anaconda3\envs\mx36\lib\site-packages (from requests->gluoncv==0.7.0) (2020.4.5.1)
Requirement already satisfied, skipping upgrade: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in d:\anaconda3\envs\mx36\lib\site-packages (from requests->gluoncv==0.7.0) (1.24.2)
Requirement already satisfied, skipping upgrade: six>=1.5 in d:\anaconda3\envs\mx36\lib\site-packages (from python-dateutil>=2.1->matplotlib->gluoncv==0.7.0) (1.12.0)
Requirement already satisfied, skipping upgrade: setuptools in d:\anaconda3\envs\mx36\lib\site-packages (from kiwisolver>=1.0.1->matplotlib->gluoncv==0.7.0) (41.4.0)
Installing collected packages: portalocker, gluoncv
Found existing installation: gluoncv 0.5.0
Uninstalling gluoncv-0.5.0:
Successfully uninstalled gluoncv-0.5.0
Successfully installed gluoncv-0.7.0 portalocker-1.7.0