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docs: fix python nix-shell example (#10841)

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* docs: fix python nix-shell example

This Python code snippet depended on Python 2 which has been marked as insecure in 24.05.

I modernized the example so new users will not be surprised upon copying and pasting the snippet for exploration.

Co-authored-by: John Ericson <git@JohnEricson.me>
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Eli Flanagan 2024-06-03 17:22:50 -04:00 committed by GitHub
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4
doc/manual/src/command-ref/nix-shell.md
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@ -202,14 +202,14 @@ For example, here is a Python script that depends on Python and the
```python
#! /usr/bin/env nix-shell
#! nix-shell -i python --packages python pythonPackages.prettytable
#! nix-shell -i python3 --packages python3 python3Packages.prettytable
import prettytable
# Print a simple table.
t = prettytable.PrettyTable(["N", "N^2"])
for n in range(1, 10): t.add_row([n, n * n])
print t
print(t)
```
Similarly, the following is a Perl script that specifies that it