python pandas pip install pandas still get error, ImportError No module named pandas

Collecting pandas
|████████████████████████████████| 9.7 MB 119 kB/s
Collecting numpy=1.16.5
|████████████████████████████████| 14.9 MB 26.9 MB/s
Collecting python-dateutil=2.7.3
|████████████████████████████████| 227 kB 5.0 MB/s
Collecting pytz=2017.3
|████████████████████████████████| 510 kB 10.2 MB/s
Collecting six=1.5
Installing collected packages: six, pytz, python-dateutil, numpy, pandas
Successfully installed numpy-1.19.5 pandas-1.2.0 python-dateutil-2.8.1 pytz-2020.5 six-1.15.0
Traceback (most recent call last):
import pandas as pd
ImportError: No module named pandas