But this time we type in the following cell block

```ipython

```{code-block} ipython

:class: no-execute

%debug

```

You should be dropped into a new prompt that looks something like this

```ipython

```{code-block} ipython

:class: no-execute

ipdb>

```

For example, here we simply type the name `ax` to see what's happening with

this object:

```ipython

```{code-block} ipython

:class: no-execute

ipdb> ax

array([<matplotlib.axes.AxesSubplot object at 0x290f5d0>,

<matplotlib.axes.AxesSubplot object at 0x2930810>], dtype=object)

To find out what else you can do from inside `ipdb` (or `pdb`), use the

online help

```ipython

```{code-block} ipython

:class: no-execute

ipdb> h

Documented commands (type help <topic>):

To this end, we add a "break point" by inserting `breakpoint()` inside the function code block

```python3

```{code-block} python3

:class: no-execute

def plot_log():

breakpoint()

fig, ax = plt.subplots()

Now let's run the script, and investigate via the debugger

```ipython

```{code-block} ipython

:class: no-execute

> <ipython-input-6-a188074383b7>(6)plot_log()

-> fig, ax = plt.subplots()

(Pdb) n