估计centos7要用pymongo 3的版本
sudo pip install -U pymongo
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality.
Collecting pymongo
Downloading pymongo-3.11.1-cp27-cp27mu-manylinux1_x86_64.whl (487 kB)
|████████████████████████████████| 487 kB 14.7 MB/s
Installing collected packages: pymongo
Attempting uninstall: pymongo
Found existing installation: pymongo 2.5.2
Uninstalling pymongo-2.5.2:
Successfully uninstalled pymongo-2.5.2
Successfully installed pymongo-3.11.1
