Fix FutureWarning: use Series.iloc[0] instead of Series[0]

[Copilot]

Fixes pandas FutureWarning about Series.__getitem__ treating integer keys as positions being deprecated.

• Use .iloc[0] for explicit positional access in stats2html()

# Before
num = len(values[0]) or 1

# After
num = len(values.iloc[0]) or 1

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Future issue warning</issue_title>
<issue_description>Wasn't sure if this was reported before but I was running NanoComp (just downloaded via bioconda) and got this future issue warning:

< /home/user/miniconda3/lib/python3.13/site-packages/nanocomp/utils.py:33: FutureWarning:

Series.getitem treating keys as positions is deprecated. In a future version, integer keys will always be treated as labels (consistent with DataFrame behavior). To access a value by position, use ser.iloc[pos] >

It seemed like this was an error with NanoComp itself so thought I would report it. Thanks and the Nano tools are awesome!!</issue_description>

<agent_instructions>this is just a warning, but would be good to solve regardless</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Future issue warning #85

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.