ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)5-classifier_example.py

In the 5-classifier_example.py,
when I run `(X_train, y_train), (X_test, y_test) = mnist.load_data()` in the Pycharm

```
Loading data...
Downloading data from https://s3.amazonaws.com/text-datasets/imdb.npz
```
error:
`ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)
`
but when I run in the ipython,
no error...

why?
