总结不考虑group_by R.

Question

这段代码有什么问题？试图通过参数名称（即化学品的名称）进行分组表示，列中的每种化学品都有多种算术方法，它们是数字，名称是字符。

Python 3.6.5 (default, May  9 2018, 15:43:39) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import ssl
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/ssl.py", line 101, in <module>
    import _ssl             # if we can't import it, let the error propagate
ModuleNotFoundError: No module named '_ssl'