请问Python虚拟环境下Jupyter Notebook中打开文件出现FileNotFoundError如何解决？

Question

虚拟环境：

    Python==3.6，
    jupyter-client==5.2.2
  

文件目录：

data_mining
└── Code_REWRITE
    ├── Chapter\ 1
    │   ├── affinity_dataset.txt
    │   ├── ch1_affinity.ipynb
    │   ├── ch1_affinity_create.ipynb
    │   ├── ch1_oner_application.ipynb
    │   ├── my_ch1_infinity.ipynb
    │   └── my_ch1_oner_application.ipynb
    ├── Chapter\ 10
    │   └── Chapter\ 10\ Clusterer.ipynb
    ├── Chapter\ 11
    │   ├── Chapter\ 11\ (CIFAR).ipynb
    │   └── Chapter\ 11\ (Theano\ and\ Lasagne).ipynb
    ├── Chapter\ 12
    │   ├── CH12\ MapReduce\ Basics.ipynb
    │   ├── Chapter\ 12\ (NB\ Predict).ipynb
    │   ├── Chapter\ 12\ (Test\ load).ipynb
    │   ├── extract_posts.py
    │   ├── nb_predict.py
    │   └── nb_train.py
    ├── Chapter\ 2
    │   ├── Ionosphere\ Nearest\ Neighbour.ipynb
    │   └── my\ Ionosphere\ Nearest\ Neighbour.ipynb
    ├── Chapter\ 3
    │   └── Basketball\ Results.ipynb
    ├── Chapter\ 4
    │   └── ch4\ Affinity\ Analysis.ipynb
    ├── Chapter\ 5
    │   ├── adult_tests.py
    │   ├── ch5_adult.ipynb
    │   └── ch5_advertisements.ipynb
    ├── Chapter\ 6
    │   ├── ch6_classify_twitter.ipynb
    │   ├── ch6_get_twitter.ipynb
    │   ├── ch6_label_twitter.ipynb
    │   └── replicable_dataset.json
    ├── Chapter\ 7
    │   ├── CH7\ From\ Load.ipynb
    │   ├── ch7_collect_twitter_data.ipynb
    │   └── ch7_part2_twitter.ipynb
    ├── Chapter\ 8
    │   ├── CH8\ Rewrite.ipynb
    │   └── Sigmoid.ipynb
    ├── Chapter\ 9
    │   ├── Chapter\ 9\ Authorship\ Analysis.ipynb
    │   └── getdata.py
    └── Data
        └── Ionosphere
            ├── ionosphere.data.txt
            └── ionosphere.names.txt

异常截图：

Any help will be appreciated!

Answer 1

data_filename少了.txt, ionosphere.data.txt