Reuven M. Lerner
@lernerpython.com
Helping you become more confident with Python and Pandas since 1995.
• Courses: LernerPython.com
• Newsletters: BetterDevelopersWeekly.com • BambooWeekly.com
• Books: PythonWorkout.com • PandasWorkout.com
• Videos: YouTube.com/reuvenlerner
• Courses: LernerPython.com
• Newsletters: BetterDevelopersWeekly.com • BambooWeekly.com
• Books: PythonWorkout.com • PandasWorkout.com
• Videos: YouTube.com/reuvenlerner
Pinned
Reuven M. Lerner
@lernerpython.com
· Nov 12
Hi there! 👋 I'm Reuven, and I've been teaching #Python and Pandas around the world since 1995.
Just about every day, my students ask great questions. I love sharing those questions (and my answers), along with other resources to help you improve your Python/Pandas fluency.
Just about every day, my students ask great questions. I love sharing those questions (and my answers), along with other resources to help you improve your Python/Pandas fluency.
This month marks 30 years (!) since I left the corporate world and started freelancing. To celebrate, here are 30 lessons I've learned about being a #Python freelancer:
lerner.co.il/2025/12/08/3...
lerner.co.il/2025/12/08/3...
30 things I’ve learned from 30 years as a Python freelancer
30 years! It’s hard to believe, but it was in December 1995 (i.e., 30 years ago) that I went freelance, giving up a stable corporate paycheck. And somehow, I’ve managed to make it work: During
lerner.co.il
December 8, 2025 at 12:30 PM
This month marks 30 years (!) since I left the corporate world and started freelancing. To celebrate, here are 30 lessons I've learned about being a #Python freelancer:
lerner.co.il/2025/12/08/3...
lerner.co.il/2025/12/08/3...
Presidential pardons are in the news. In the latest Bamboo Weekly, we analyze pardon data from the Department of Justice.
Level up your #Python and #Pandas skills, including Web scraping, cleaning, grouping, and plotting!
New questions every week at bambooweekly.com .
Level up your #Python and #Pandas skills, including Web scraping, cleaning, grouping, and plotting!
New questions every week at bambooweekly.com .
December 4, 2025 at 10:51 PM
Presidential pardons are in the news. In the latest Bamboo Weekly, we analyze pardon data from the Department of Justice.
Level up your #Python and #Pandas skills, including Web scraping, cleaning, grouping, and plotting!
New questions every week at bambooweekly.com .
Level up your #Python and #Pandas skills, including Web scraping, cleaning, grouping, and plotting!
New questions every week at bambooweekly.com .
Do you use #Jupyter with #Python #Pandas?
You should check out @marimo.io, a notebook that solves many Jupyter's issues.
My talk from last month's @PyDataTLV introduced and demo'ed Marimo, with live demos of its features.
Take a look: youtu.be/koAgUxKndNU
You should check out @marimo.io, a notebook that solves many Jupyter's issues.
My talk from last month's @PyDataTLV introduced and demo'ed Marimo, with live demos of its features.
Take a look: youtu.be/koAgUxKndNU
Reuven Lerner: Marimo - A new notebook | PyData Tel Aviv 2025
YouTube video by PyData
youtu.be
December 4, 2025 at 5:47 PM
Do you use #Jupyter with #Python #Pandas?
You should check out @marimo.io, a notebook that solves many Jupyter's issues.
My talk from last month's @PyDataTLV introduced and demo'ed Marimo, with live demos of its features.
Take a look: youtu.be/koAgUxKndNU
You should check out @marimo.io, a notebook that solves many Jupyter's issues.
My talk from last month's @PyDataTLV introduced and demo'ed Marimo, with live demos of its features.
Take a look: youtu.be/koAgUxKndNU
Last month, I published a free, 12-part "uv crash course". Hundreds of people took it, and are now using #Python uv better.
But: I keep learning new things. So I've updated the course to have *15* lessons.
Feel like you aren't using uv correctly? Check out the free course at uvcrashcourse.com !
But: I keep learning new things. So I've updated the course to have *15* lessons.
Feel like you aren't using uv correctly? Check out the free course at uvcrashcourse.com !
uv crash course - LernerPython
uvCrashCourse.com
December 3, 2025 at 12:21 AM
Last month, I published a free, 12-part "uv crash course". Hundreds of people took it, and are now using #Python uv better.
But: I keep learning new things. So I've updated the course to have *15* lessons.
Feel like you aren't using uv correctly? Check out the free course at uvcrashcourse.com !
But: I keep learning new things. So I've updated the course to have *15* lessons.
Feel like you aren't using uv correctly? Check out the free course at uvcrashcourse.com !
Traveling for Thanksgiving? So are lots of other people!
But is this really the busiest travel period of the year?
In the latest Bamboo Weekly, we look at US travel trends using TSA data.
Improve your #Python #Pandas data-analysis skills every week: bambooweekly.com
But is this really the busiest travel period of the year?
In the latest Bamboo Weekly, we look at US travel trends using TSA data.
Improve your #Python #Pandas data-analysis skills every week: bambooweekly.com
November 26, 2025 at 7:30 PM
Traveling for Thanksgiving? So are lots of other people!
But is this really the busiest travel period of the year?
In the latest Bamboo Weekly, we look at US travel trends using TSA data.
Improve your #Python #Pandas data-analysis skills every week: bambooweekly.com
But is this really the busiest travel period of the year?
In the latest Bamboo Weekly, we look at US travel trends using TSA data.
Improve your #Python #Pandas data-analysis skills every week: bambooweekly.com
Reposted by Reuven M. Lerner
Are you a #Python user and a lifelong learner?
I've just published my 8th annual list of every Python-related Black Friday / Cyber Monday sale I'm aware of.
I've just published my 8th annual list of every Python-related Black Friday / Cyber Monday sale I'm aware of.
Python Black Friday & Cyber Monday sales (2025)
It’s time for some discounted Python-related skill-building.
This is my eighth annual compilation of Python learning-related Black Friday & …
treyhunner.com
November 24, 2025 at 4:41 PM
Are you a #Python user and a lifelong learner?
I've just published my 8th annual list of every Python-related Black Friday / Cyber Monday sale I'm aware of.
I've just published my 8th annual list of every Python-related Black Friday / Cyber Monday sale I'm aware of.
How is the US economy doing?
In the latest Bamboo Weekly, I challenge you to find out:
• Retrieve 8 indicators from FRED
• Combine them in a Pandas data frame
• Filter them with Marimo UI elements
• Plot them with Plotly
Get new real-world exercises each week: bambooweekly.com
In the latest Bamboo Weekly, I challenge you to find out:
• Retrieve 8 indicators from FRED
• Combine them in a Pandas data frame
• Filter them with Marimo UI elements
• Plot them with Plotly
Get new real-world exercises each week: bambooweekly.com
November 19, 2025 at 6:00 PM
How is the US economy doing?
In the latest Bamboo Weekly, I challenge you to find out:
• Retrieve 8 indicators from FRED
• Combine them in a Pandas data frame
• Filter them with Marimo UI elements
• Plot them with Plotly
Get new real-world exercises each week: bambooweekly.com
In the latest Bamboo Weekly, I challenge you to find out:
• Retrieve 8 indicators from FRED
• Combine them in a Pandas data frame
• Filter them with Marimo UI elements
• Plot them with Plotly
Get new real-world exercises each week: bambooweekly.com
• Frustrated that after learning #Python, you still don't 'understand how it works?
• Want at structured learning path to improve your Python?
• Want to feel more comfortable at interviews?
• Tired of data exercises that are tiny or fake?
• Want at structured learning path to improve your Python?
• Want to feel more comfortable at interviews?
• Tired of data exercises that are tiny or fake?
November 16, 2025 at 4:00 PM
• Frustrated that after learning #Python, you still don't 'understand how it works?
• Want at structured learning path to improve your Python?
• Want to feel more comfortable at interviews?
• Tired of data exercises that are tiny or fake?
• Want at structured learning path to improve your Python?
• Want to feel more comfortable at interviews?
• Tired of data exercises that are tiny or fake?
In today's Bamboo Weekly, I pose 5 data-analysis questions about museum heists — based on a recent paper, and the recent theft from the Louvre in Paris.
Use grouping, regular expressions, and multi-indexes to analyze heist data!
Improve your Pandas skills every Wednesday: bambooweekly.com
Use grouping, regular expressions, and multi-indexes to analyze heist data!
Improve your Pandas skills every Wednesday: bambooweekly.com
November 12, 2025 at 5:00 PM
In today's Bamboo Weekly, I pose 5 data-analysis questions about museum heists — based on a recent paper, and the recent theft from the Louvre in Paris.
Use grouping, regular expressions, and multi-indexes to analyze heist data!
Improve your Pandas skills every Wednesday: bambooweekly.com
Use grouping, regular expressions, and multi-indexes to analyze heist data!
Improve your Pandas skills every Wednesday: bambooweekly.com
Do you use Python, but...
• want to go beyond the syntax?
• want to feel confident in interviews?
• want to work on real data projects?
A new cohort of my #Python Data Analytics Bootcamp is starting soon! Join me on November 18th for a free info session.
More info: pythondab.com
• want to go beyond the syntax?
• want to feel confident in interviews?
• want to work on real data projects?
A new cohort of my #Python Data Analytics Bootcamp is starting soon! Join me on November 18th for a free info session.
More info: pythondab.com
PythonDAB — Reuven's Python Analytics Bootcamp - LernerPython
Start your new career in Data Analytics
PythonDAB.com
November 11, 2025 at 8:00 PM
Do you use Python, but...
• want to go beyond the syntax?
• want to feel confident in interviews?
• want to work on real data projects?
A new cohort of my #Python Data Analytics Bootcamp is starting soon! Join me on November 18th for a free info session.
More info: pythondab.com
• want to go beyond the syntax?
• want to feel confident in interviews?
• want to work on real data projects?
A new cohort of my #Python Data Analytics Bootcamp is starting soon! Join me on November 18th for a free info session.
More info: pythondab.com
uv makes #Python packaging it fast, easy, and modern — replacing everything from pip, pyenv, and pipx to twine, venv, and Poetry.
If you’ve been wondering whether — and how — to switch to uv and use it, my free, 12-part course will you everything you need.
Take a look: youtu.be/PrRQC3_6scQ
If you’ve been wondering whether — and how — to switch to uv and use it, my free, 12-part course will you everything you need.
Take a look: youtu.be/PrRQC3_6scQ
Learn uv with my all-new "uv crash course", at https://uvcrashcourse.com
YouTube video by Python and Pandas with Reuven Lerner
youtu.be
November 10, 2025 at 1:07 PM
uv makes #Python packaging it fast, easy, and modern — replacing everything from pip, pyenv, and pipx to twine, venv, and Poetry.
If you’ve been wondering whether — and how — to switch to uv and use it, my free, 12-part course will you everything you need.
Take a look: youtu.be/PrRQC3_6scQ
If you’ve been wondering whether — and how — to switch to uv and use it, my free, 12-part course will you everything you need.
Take a look: youtu.be/PrRQC3_6scQ
In the latest Bamboo Weekly, I pose data-analysis questions about cellphones in schools:
• What policies do schools have?
° Do rules differ by age or region?
• What effects (positive and negative) do schools report from phone use?
Level up your #Python #Pandas skills every week: bambooweekly.com
• What policies do schools have?
° Do rules differ by age or region?
• What effects (positive and negative) do schools report from phone use?
Level up your #Python #Pandas skills every week: bambooweekly.com
November 7, 2025 at 11:00 AM
In the latest Bamboo Weekly, I pose data-analysis questions about cellphones in schools:
• What policies do schools have?
° Do rules differ by age or region?
• What effects (positive and negative) do schools report from phone use?
Level up your #Python #Pandas skills every week: bambooweekly.com
• What policies do schools have?
° Do rules differ by age or region?
• What effects (positive and negative) do schools report from phone use?
Level up your #Python #Pandas skills every week: bambooweekly.com
Assignment in #Python seems so simple... but when you use =, a lot of different things can happen!
In my talk from @europython.eu, I described what happens when you use =, from variables to attributes to descriptors -- including the behind-the-scenes opcodes.
Take a look: youtu.be/0eSutJEeR5c
In my talk from @europython.eu, I described what happens when you use =, from variables to attributes to descriptors -- including the behind-the-scenes opcodes.
Take a look: youtu.be/0eSutJEeR5c
What does = do? — Reuven M. Lerner
YouTube video by EuroPython Conference
youtu.be
November 4, 2025 at 7:25 AM
Assignment in #Python seems so simple... but when you use =, a lot of different things can happen!
In my talk from @europython.eu, I described what happens when you use =, from variables to attributes to descriptors -- including the behind-the-scenes opcodes.
Take a look: youtu.be/0eSutJEeR5c
In my talk from @europython.eu, I described what happens when you use =, from variables to attributes to descriptors -- including the behind-the-scenes opcodes.
Take a look: youtu.be/0eSutJEeR5c
Want to learn uv?
uv has taken the #Python world by storm. But using it isn't just about learning a few commands.
That's where my new, free, 12-part "uv crash course" comes in. Every day, you'll get detailed e-mail with info about using uv.
Sign up: uvcrashcourse.com
uv has taken the #Python world by storm. But using it isn't just about learning a few commands.
That's where my new, free, 12-part "uv crash course" comes in. Every day, you'll get detailed e-mail with info about using uv.
Sign up: uvcrashcourse.com
November 3, 2025 at 1:11 PM
Want to learn uv?
uv has taken the #Python world by storm. But using it isn't just about learning a few commands.
That's where my new, free, 12-part "uv crash course" comes in. Every day, you'll get detailed e-mail with info about using uv.
Sign up: uvcrashcourse.com
uv has taken the #Python world by storm. But using it isn't just about learning a few commands.
That's where my new, free, 12-part "uv crash course" comes in. Every day, you'll get detailed e-mail with info about using uv.
Sign up: uvcrashcourse.com
How do you connect #FastAPI to a database?
In this 30-minute tutorial, I create a simple FastAPI app that implements a blog — starting with uv, then going onto an SQLModel class, then going through the various FastAPI functions we need for it to work.
Have a look: www.youtube.com/watch?v=eZGy...
In this 30-minute tutorial, I create a simple FastAPI app that implements a blog — starting with uv, then going onto an SQLModel class, then going through the various FastAPI functions we need for it to work.
Have a look: www.youtube.com/watch?v=eZGy...
Getting started with FastAPI and SQLModel — Build a simple blog API (full tutorial)
YouTube video by Python and Pandas with Reuven Lerner
www.youtube.com
October 31, 2025 at 8:54 AM
How do you connect #FastAPI to a database?
In this 30-minute tutorial, I create a simple FastAPI app that implements a blog — starting with uv, then going onto an SQLModel class, then going through the various FastAPI functions we need for it to work.
Have a look: www.youtube.com/watch?v=eZGy...
In this 30-minute tutorial, I create a simple FastAPI app that implements a blog — starting with uv, then going onto an SQLModel class, then going through the various FastAPI functions we need for it to work.
Have a look: www.youtube.com/watch?v=eZGy...
Hurricane Melissa is causing awful damage. In the latest Bamboo Weekly, I pose six problems based on NOAA hurricane data -- using grouping, resampling, and plotting on windspeed and even their names.
Check out bambooweekly.com, and level up your Pandas skills!
Check out bambooweekly.com, and level up your Pandas skills!
October 30, 2025 at 7:00 PM
Hurricane Melissa is causing awful damage. In the latest Bamboo Weekly, I pose six problems based on NOAA hurricane data -- using grouping, resampling, and plotting on windspeed and even their names.
Check out bambooweekly.com, and level up your Pandas skills!
Check out bambooweekly.com, and level up your Pandas skills!
The latest Bamboo Weekly has it all: Joins, plotting, and Marimo UI elements... but also central banking, inflation, and macroeconomics.
(Also: A panda dressed like Eva Peron!)
Solve problems related to Argentina with real-world data, while improving your Pandas.
Check it out: bambooweekly.com
(Also: A panda dressed like Eva Peron!)
Solve problems related to Argentina with real-world data, while improving your Pandas.
Check it out: bambooweekly.com
October 23, 2025 at 3:01 PM
The latest Bamboo Weekly has it all: Joins, plotting, and Marimo UI elements... but also central banking, inflation, and macroeconomics.
(Also: A panda dressed like Eva Peron!)
Solve problems related to Argentina with real-world data, while improving your Pandas.
Check it out: bambooweekly.com
(Also: A panda dressed like Eva Peron!)
Solve problems related to Argentina with real-world data, while improving your Pandas.
Check it out: bambooweekly.com
How much do developers earn? What languages (other than Python) do they want to learn?
In the latest Bamboo Weekly, we analyze results from the 2025 Stack Overflow survey.
Improve your #Python #Pandas and #dataanalysis skills — questions on Wednesdays, solutions on Thursdays.
bambooweekly.com
In the latest Bamboo Weekly, we analyze results from the 2025 Stack Overflow survey.
Improve your #Python #Pandas and #dataanalysis skills — questions on Wednesdays, solutions on Thursdays.
bambooweekly.com
October 16, 2025 at 7:05 PM
How much do developers earn? What languages (other than Python) do they want to learn?
In the latest Bamboo Weekly, we analyze results from the 2025 Stack Overflow survey.
Improve your #Python #Pandas and #dataanalysis skills — questions on Wednesdays, solutions on Thursdays.
bambooweekly.com
In the latest Bamboo Weekly, we analyze results from the 2025 Stack Overflow survey.
Improve your #Python #Pandas and #dataanalysis skills — questions on Wednesdays, solutions on Thursdays.
bambooweekly.com
The US has imposed big tariffs on Chinese goods. Have they affected China's exports to the US? To the rest of the world?
Bamboo Weekly asks you to answer these questions using #Python and #pandas , using Chinese export stats.
Get new data challenges every Wednesday: bambooweekly.com .
Bamboo Weekly asks you to answer these questions using #Python and #pandas , using Chinese export stats.
Get new data challenges every Wednesday: bambooweekly.com .
October 8, 2025 at 4:16 PM
The US has imposed big tariffs on Chinese goods. Have they affected China's exports to the US? To the rest of the world?
Bamboo Weekly asks you to answer these questions using #Python and #pandas , using Chinese export stats.
Get new data challenges every Wednesday: bambooweekly.com .
Bamboo Weekly asks you to answer these questions using #Python and #pandas , using Chinese export stats.
Get new data challenges every Wednesday: bambooweekly.com .
The US government is shut down! But Bamboo Weekly is still is on the job, with #dataanalysis puzzles — this time, about US federal employees.
Get new #Python #Pandas challenges on Wednesdays, with detailed solutions and explanations on Thursdays, at bambooweekly.com .
Get new #Python #Pandas challenges on Wednesdays, with detailed solutions and explanations on Thursdays, at bambooweekly.com .
October 3, 2025 at 6:38 AM
The US government is shut down! But Bamboo Weekly is still is on the job, with #dataanalysis puzzles — this time, about US federal employees.
Get new #Python #Pandas challenges on Wednesdays, with detailed solutions and explanations on Thursdays, at bambooweekly.com .
Get new #Python #Pandas challenges on Wednesdays, with detailed solutions and explanations on Thursdays, at bambooweekly.com .
The UN is in session. For politicians, that means speeches and fancy meetings.
And so, Bamboo Weekly's latest batch of #Pandas challenges use grouping, text analysis, and pivot tables to review Security Council records.
Check them out: bambooweekly.com
And so, Bamboo Weekly's latest batch of #Pandas challenges use grouping, text analysis, and pivot tables to review Security Council records.
Check them out: bambooweekly.com
September 25, 2025 at 3:20 PM
The UN is in session. For politicians, that means speeches and fancy meetings.
And so, Bamboo Weekly's latest batch of #Pandas challenges use grouping, text analysis, and pivot tables to review Security Council records.
Check them out: bambooweekly.com
And so, Bamboo Weekly's latest batch of #Pandas challenges use grouping, text analysis, and pivot tables to review Security Council records.
Check them out: bambooweekly.com
I had a great time at PyCon India, and in Bangalore. But the traffic was ... quite the experience, both taking taxis crossing streets.
For this week's data-analysis problems in Bamboo Weekly, I thus looked at vehicle registrations in India.
Check it out at bambooweekly.com!
For this week's data-analysis problems in Bamboo Weekly, I thus looked at vehicle registrations in India.
Check it out at bambooweekly.com!
September 19, 2025 at 12:01 PM
I had a great time at PyCon India, and in Bangalore. But the traffic was ... quite the experience, both taking taxis crossing streets.
For this week's data-analysis problems in Bamboo Weekly, I thus looked at vehicle registrations in India.
Check it out at bambooweekly.com!
For this week's data-analysis problems in Bamboo Weekly, I thus looked at vehicle registrations in India.
Check it out at bambooweekly.com!
Reposted by Reuven M. Lerner
📊 Who is using Python, and how?
@lernerpython.com explores the latest Python Developer Survey in the latest installment of “Bamboo Weekly”, a newsletter featuring new Pandas data analysis puzzles and solutions every week.
➡️ Explore Reuven’s deep-dive: jb.gg/bwnjbs
@lernerpython.com explores the latest Python Developer Survey in the latest installment of “Bamboo Weekly”, a newsletter featuring new Pandas data analysis puzzles and solutions every week.
➡️ Explore Reuven’s deep-dive: jb.gg/bwnjbs
jb.gg
September 15, 2025 at 2:26 PM
📊 Who is using Python, and how?
@lernerpython.com explores the latest Python Developer Survey in the latest installment of “Bamboo Weekly”, a newsletter featuring new Pandas data analysis puzzles and solutions every week.
➡️ Explore Reuven’s deep-dive: jb.gg/bwnjbs
@lernerpython.com explores the latest Python Developer Survey in the latest installment of “Bamboo Weekly”, a newsletter featuring new Pandas data analysis puzzles and solutions every week.
➡️ Explore Reuven’s deep-dive: jb.gg/bwnjbs
Ever wonder which airlines are more cramped? Or how much more room premium economy or business class gives you?
In the latest Bamboo Weekly, we use #Pandas to analyze airline seating data with grouping, pivot tables, and regular expressions.
New Pandas questions every Wednesday: bambooweekly.com
In the latest Bamboo Weekly, we use #Pandas to analyze airline seating data with grouping, pivot tables, and regular expressions.
New Pandas questions every Wednesday: bambooweekly.com
September 11, 2025 at 10:48 AM
Ever wonder which airlines are more cramped? Or how much more room premium economy or business class gives you?
In the latest Bamboo Weekly, we use #Pandas to analyze airline seating data with grouping, pivot tables, and regular expressions.
New Pandas questions every Wednesday: bambooweekly.com
In the latest Bamboo Weekly, we use #Pandas to analyze airline seating data with grouping, pivot tables, and regular expressions.
New Pandas questions every Wednesday: bambooweekly.com
It's hot and rainy in Taipei. But just how rainy?
In my PyCon TW lightning talk, I downloaded, analyzed, and plotted rain data using Pandas.
I did it all in @marimo.io , and posted it to the "Molab" server, so you run the analysis in your browser: molab.marimo.io/notebooks/nb...
In my PyCon TW lightning talk, I downloaded, analyzed, and plotted rain data using Pandas.
I did it all in @marimo.io , and posted it to the "Molab" server, so you run the analysis in your browser: molab.marimo.io/notebooks/nb...
September 10, 2025 at 10:09 AM
It's hot and rainy in Taipei. But just how rainy?
In my PyCon TW lightning talk, I downloaded, analyzed, and plotted rain data using Pandas.
I did it all in @marimo.io , and posted it to the "Molab" server, so you run the analysis in your browser: molab.marimo.io/notebooks/nb...
In my PyCon TW lightning talk, I downloaded, analyzed, and plotted rain data using Pandas.
I did it all in @marimo.io , and posted it to the "Molab" server, so you run the analysis in your browser: molab.marimo.io/notebooks/nb...