尽管我安装了以下库，但无法使用它：
$ pip3 install gffpandas
Requirement already satisfied: gffpandas in /usr/local/lib/python3.7/site-packages (1.2.0)
$ python
Python 3.7.3 | packaged by conda-forge | (default, Jul 1 2019, 14:38:56)
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import gffpandas.gffpandas as gffpd
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'gffpandas'
我想念什么？
先谢谢您