Use executed code in a previous file

[yangli-stat]

One of my chapters (chapter 2) has several sections. They are saved in separate files. The _toc.yml file looks like this.

format: jb-book
root: intro
options:
  numbered: true
chapters:
- file: chapter1/chap1.ipynb
- file: chapter2/chap2main.ipynb
  sections:
  - file: chapter2/chap2sec1.ipynb
  - file: chapter2/chap2sec2.ipynb
  - file: chapter2/chap2sec3.ipynb
  - file: chapter2/chap2sec4.ipynb

In chap2sec1.ipynb, there is a command import pandas as pd to load pandas. All codes with pd.read_csv in this section work fine.

In chap2sec2.ipynb, I am trying to read another file using mydata = pd.read_csv("..."). Something is wrong because there is an error message in the book.

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
/var/folders/tq/mrh1ffvs7jqbpmh3f2w5qf3c0000gn/T/ipykernel_43122/2091571339.py in <module>
----> 1 mydata = pd.read_csv("...")

NameError: name 'pd' is not defined

It seems the command executed in an earlier file doesn't follow through to subsequent files. How do I fix this? Thanks.

[stoffprof]

I assume you're executing the notebooks when you build the book, and believe they're executed in different kernels. So you just have to import pandas in each notebook.

[choldgraf]

Yep - each notebook is a self-contained script, so they do not share information between them (unless you read/write from disk and such)