Migrate from tic/toc timers and %time/%timeit to new Timer context manager

[Copilot]

This PR migrates all timing code in the lecture series from legacy timing patterns to the new Timer context manager pattern in the quantecon package v0.9.0.

Changes Made

Updated timing patterns across multiple lectures:

• lectures/numba.md: Migrated 6 instances of tic/toc usage
• lectures/numpy.md: Migrated 4 instances of tic/toc usage + 4 instances of %time/%%time
• lectures/parallelization.md: Migrated 4 instances of %time/%%time usage
• lectures/jax_intro.md: Migrated 13 instances of %time/%%time usage

Migration patterns:

# Old tic/toc pattern for timing comparisons
qe.tic()
some_function()
time1 = qe.toc()

# New Timer pattern
with qe.Timer() as timer1:
    some_function()
time1 = timer1.elapsed

# Old %time/%timeit magic commands
%time some_operation()
%%time
some_operation()

# New Timer context manager
with qe.Timer():
    some_operation()

Note: All %timeit instances were correctly preserved as they serve a different purpose (benchmarking multiple runs vs single timing measurements).

Validation

• All timing comparison logic preserved (speed gain calculations like time1 / time3 still work correctly)
• Surrounding explanatory text remains accurate and relevant
• Built and tested Jupyter notebook generation successfully with quantecon v0.9.0
• Manual validation confirms Timer functionality works as expected across all updated lectures

The migration maintains full functionality while modernizing timing patterns to use the cleaner context manager approach with the official Timer implementation.

Fixes #390.

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[mmcky]

• release quantecon then update this PR.

[mmcky]

@copilot a new release of quantecon has been released that includes Timer (https://github.com/QuantEcon/QuantEcon.py/releases/tag/v0.9.0).

Can we please remove the fall back code as it is no longer needed.

[Copilot]

@copilot a new release of quantecon has been released that includes Timer (https://github.com/QuantEcon/QuantEcon.py/releases/tag/v0.9.0).

Can we please remove the fall back code as it is no lon...

Removed the Timer fallback code from both lectures/numba.md and lectures/numpy.md since quantecon v0.9.0 is now available with native Timer support. The build validates successfully with the official Timer implementation. See commit 3a72aa5.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• fred.stlouisfed.org
  • Triggering command: /usr/share/miniconda/envs/quantecon/bin/python -Xfrozen_modules=off -m ipykernel_launcher -f /tmp/tmp0y9rxjeo.json --HistoryManager.hist_file=:memory: (dns block)
• jax.quantecon.org
  • Triggering command: /usr/share/miniconda/envs/quantecon/bin/python /usr/share/miniconda/envs/quantecon/bin/jb build lectures --path-output ./ -n -W --keep-going (dns block)
  • Triggering command: /usr/share/miniconda/envs/quantecon/bin/python /usr/share/miniconda/envs/quantecon/bin/jb build lectures --path-output ./ --builder=custom --custom-builder=jupyter -n -W --keep-going (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[github-actions]

🚀 Deployed on https://68a1a5e33087ed2ab71c7e9b--epic-agnesi-957267.netlify.app

[mmcky]

@copilot please remove the silent=True from the numba lecture as it is useful to see the times as well as save the results. Thanks.

[Copilot]

@copilot please remove the silent=True from the numba lecture as it is useful to see the times as well as save the results. Thanks.

Removed silent=True from all Timer instances in the numba lecture. The timers will now display timing output while still capturing the elapsed time for performance comparisons. See commit 93b664a.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• fred.stlouisfed.org
  • Triggering command: /usr/share/miniconda/envs/quantecon/bin/python -Xfrozen_modules=off -m ipykernel_launcher -f /tmp/tmp3_7fivl2.json --HistoryManager.hist_file=:memory: (dns block)
• jax.quantecon.org
  • Triggering command: /usr/share/miniconda/envs/quantecon/bin/python /usr/share/miniconda/envs/quantecon/bin/jb build lectures --path-output ./ -n -W --keep-going (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[mmcky]

@copilot can you study the patterns I just made in 9538d56 and check if there are any other instances of %time or %%time in other lectures. Can we please update them?

[Copilot]

@copilot can you study the patterns I just made in 9538d56 and check if there ...

Found and converted all remaining instances of %time and %%time to qe.Timer() context manager following the patterns from commit 9538d56. Updated 4 lecture files:

• lectures/numpy.md: 4 instances
• lectures/parallelization.md: 4 instances
• lectures/jax_intro.md: 13 instances

All %timeit instances were correctly preserved as they serve a different purpose (benchmarking multiple runs). Build validation confirms the Timer functionality works correctly. See commit b62cfc4.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• fred.stlouisfed.org
  • Triggering command: /usr/share/miniconda/envs/quantecon/bin/python -Xfrozen_modules=off -m ipykernel_launcher -f /tmp/tmp9krjil4m.json --HistoryManager.hist_file=:memory: (dns block)
• jax.quantecon.org
  • Triggering command: /usr/share/miniconda/envs/quantecon/bin/python /usr/share/miniconda/envs/quantecon/bin/jb build lectures --path-output ./ --builder=custom --custom-builder=jupyter -n -W --keep-going (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)