python 用 python -m pip install --upgrade pip 更新 pip 后 还是不行该怎么办

C:\Users\coddM>pip install pil Collecting pil Could not find a version that satisfies the requirement pil (from versions: ) No matching distribution found for pil You are using pip version 7.1.2, however version 8.1.2 is available. You should consider upgrading via the 'python -m pip install --upgrade pip' command.

C:\Users\coddM>python -m pip install --upgrade pip Requirement already up-to-date: pip in c:\python35\lib\site-packages