cannot import httpx when running weather.py app from Textual dev command line.

[greendavegreen]

working with the weather.py example in the workers section of the documentation, I ran into trouble running from Textual dev tooling. when I run either regular or dev mode using textual, I get a httpx module not found error.

the same trouble affects my application which I have been happily developing once I added httpx as an import. I would like to debug and see events while making network calls.

textual diagnose

Traceback (most recent call last):
  File "/Users/gdave/VSProjects/tui/1337/weather.py", line 1, in <module>
    import httpx
ModuleNotFoundError: No module named 'httpx'```

<!-- This is valid Markdown, please paste the following directly in to a GitHub issue -->
# Textual Diagnostics

## Versions

| Name    | Value  |
|---------|--------|
| Textual | 0.45.1 |
| Rich    | 13.7.0 |

## Python

| Name           | Value                                     |
|----------------|-------------------------------------------|
| Version        | 3.11.6                                    |
| Implementation | CPython                                   |
| Compiler       | Clang 15.0.0 (clang-1500.0.40.1)          |
| Executable     | /usr/local/opt/[email protected]/bin/python3.11 |

## Operating System

| Name    | Value                                                                                            |
|---------|--------------------------------------------------------------------------------------------------|
| System  | Darwin                                                                                           |
| Release | 23.2.0                                                                                           |
| Version | Darwin Kernel Version 23.2.0: Wed Nov 15 21:54:10 PST 2023; root:xnu-10002.61.3~2/RELEASE_X86_64 |

## Terminal

| Name                 | Value              |
|----------------------|--------------------|
| Terminal Application | iTerm.app (3.4.22) |
| TERM                 | xterm-256color     |
| COLORTERM            | truecolor          |
| FORCE_COLOR          | *Not set*          |
| NO_COLOR             | *Not set*          |

## Rich Console options

| Name           | Value                |
|----------------|----------------------|
| size           | width=143, height=58 |
| legacy_windows | False                |
| min_width      | 1                    |
| max_width      | 143                  |
| is_terminal    | True                 |
| encoding       | utf-8                |
| max_height     | 58                   |
| justify        | None                 |
| overflow       | None                 |
| no_wrap        | False                |
| highlight      | None                 |
| markup         | None                 |
| height         | None                 |

[TomJGooding]

httpx is an external library which you will need to install with pip install httpx.