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"https://lernerpython.com/2026/01/04/python-sequences-the-shared-api-of-str-list-and-tuple/", "published_at": "2026-01-04T07:00:00+00:00" }, { "id": "01a0bbd5-a266-7217-afe4-5e5d85a06409", "title": "Python weekend check: Detecting Saturday and Sunday with weekday()", "url": "https://lernerpython.com/2026/01/03/python-weekend-check-detecting-saturday-and-sunday-with-weekday/", "published_at": "2026-01-03T07:00:00+00:00" }, { "id": "01a0bbd5-a266-7217-afe4-5e5d8612c7e0", "title": "Python is vs ==: Object identity and value equality", "url": "https://lernerpython.com/2026/01/02/python-is-vs-object-identity-and-value-equality/", "published_at": "2026-01-02T07:00:00+00:00" }, { "id": "01a0bbd5-a266-7217-afe4-5e5d86a90991", "title": "Python numeric literals: Using underscores to group digits", "url": "https://lernerpython.com/2026/01/01/python-numeric-literals-using-underscores-to-group-digits/", "published_at": "2026-01-01T07:00:00+00:00" }, { "id": "01a0bbd5-a266-7217-afe4-5e5d86e90350", "title": "Reuven’s 2025 in review", "url": "https://lernerpython.com/2025/12/23/reuvens-2025-in-review/", "published_at": "2025-12-23T14:44:22+00:00" }, { "id": "01a0bbd5-a266-7217-afe4-5e5d87de29ab", "title": "30 things I’ve learned from 30 years as a Python freelancer", "url": "https://lernerpython.com/2025/12/08/30-things-ive-learned-from-30-years-in-business/", "published_at": "2025-12-08T11:36:27+00:00" }, { "id": "01a0bbd9-516d-720a-a917-f736c5fa1a24", "title": "Want to learn uv?", "url": "https://lernerpython.com/2025/11/03/want-to-learn-uv/", "published_at": "2025-11-03T13:15:29+00:00" }, { "id": "01a0bbd9-516d-720a-a917-f736c65e7dba", "title": "Your personal mentor for Python and Pandas", "url": "https://lernerpython.com/2025/10/21/your-personal-mentor-for-python-and-pandas/", "published_at": "2025-10-21T13:05:05+00:00" }, { "id": "01a0bbd9-516d-720a-a917-f736c7326684", "title": "You’re probably using uv wrong", "url": "https://lernerpython.com/2025/08/28/youre-probably-using-uv-wrong/", "published_at": "2025-08-28T08:56:57+00:00" }, { "id": "01a0bbd9-516d-720a-a917-f736c743e48d", "title": "How to conference", "url": "https://lernerpython.com/2025/07/27/how-to-conference/", "published_at": "2025-07-27T11:16:53+00:00" }, { "id": "01a0bbd9-516d-720a-a917-f736c7f72122", "title": "My newest course: HOPPy (Hands-on Projects in Python)", "url": "https://lernerpython.com/2025/03/13/my-newest-course-hoppy-hands-on-projects-in-python/", "published_at": "2025-03-13T13:54:58+00:00" }, { "id": "01a0bbd9-516d-720a-a917-f736c820d545", "title": "Eleven days on Iceland’s Ring Road", "url": "https://lernerpython.com/2025/01/05/eleven-days-on-icelands-ring-road/", "published_at": "2025-01-05T10:46:43+00:00" }, { "id": "01a0bbd9-516d-720a-a917-f736c8d03e94", "title": "Level up your Python skills this August", "url": "https://lernerpython.com/2024/08/08/level-up-your-python-skills-this-august/", "published_at": "2024-08-08T19:07:40+00:00" }, { "id": "01a0bbd9-516d-720a-a917-f736c9682cbb", "title": "Prepare yourself for a better career, with my new Python learning memberships", "url": "https://lernerpython.com/2023/11/23/prepare-yourself-for-a-better-career-with-my-new-python-learning-memberships/", "published_at": "2023-11-23T11:46:26+00:00" }, { "id": "01a0bbd9-516d-720a-a917-f736c995bb45", "title": "I’m banned for life from advertising on Meta. Because I teach Python.", "url": "https://lernerpython.com/2023/10/19/im-banned-for-life-from-advertising-on-meta-because-i-teach-python/", "published_at": "2023-10-19T06:31:41+00:00" }, { "id": "01a0bbd9-516d-720a-a917-f736ca28085b", "title": "Sharpen your Pandas skills with “Bamboo Weekly”", "url": "https://lernerpython.com/2023/02/16/sharpen-your-pandas-skills-with-bamboo-weekly/", "published_at": "2023-02-16T11:50:32+00:00" }, { "id": "01a0bbdc-fdc6-7308-a377-400631f83488", "title": "My Week with ChatGPT", "url": "https://lernerpython.com/2022/12/11/my-week-with-chatgpt/", "published_at": "2022-12-11T20:39:26+00:00" }, { "id": "01a0bbdc-fdc6-7308-a377-400632f4a75a", "title": "Improve your Python skills — at 40% off", "url": "https://lernerpython.com/2022/11/24/improve-your-python-skills-at-40-off/", "published_at": "2022-11-24T20:00:20+00:00" }, { "id": "01a0bbdc-fdc6-7308-a377-400632fdda6c", "title": "Level up your career with PythonDAB — the Python Data Analytics Bootcamp", "url": "https://lernerpython.com/2022/11/14/level-up-your-career-with-pythondab-the-python-data-analytics-bootcamp/", "published_at": "2022-11-14T09:09:46+00:00" }, { "id": "01a0bbdc-fdc6-7308-a377-4006332dc2e8", "title": "Upcoming Python/Pandas courses for seasoned coders", "url": "https://lernerpython.com/2022/10/23/upcoming-python-pandas-courses-for-seasoned-coders/", "published_at": "2022-10-23T13:22:39+00:00" }, { "id": "01a0bbdc-fdc6-7308-a377-400633418fc9", "title": "Lots of new YouTube videos about Python and Pandas!", "url": "https://lernerpython.com/2022/10/21/lots-of-new-youtube-videos-about-python-and-pandas/", "published_at": "2022-10-21T02:36:57+00:00" }, { "id": "01a0bbdc-fdc6-7308-a377-400634313e82", "title": "How to propose a winning conference talk", "url": "https://lernerpython.com/2022/10/19/how-to-propose-a-winning-conference-talk/", "published_at": "2022-10-19T12:46:48+00:00" }, { "id": "01a0bbdc-fdc6-7308-a377-400634c769ca", "title": "Announcing PythonDAB: The course I’ve always wanted to teach", "url": "https://lernerpython.com/2022/05/24/announcing-pythondab-the-course-ive-always-wanted-to-teach/", "published_at": "2022-05-24T07:42:46+00:00" }, { "id": "01a0bbdc-fdc6-7308-a377-4006354edf4a", "title": "The “why” of object-oriented programming (in Python)", "url": "https://lernerpython.com/2022/04/01/the-why-of-object-oriented-programming-in-python/", "published_at": "2022-04-01T12:12:02+00:00" }, { "id": "01a0bbdc-fdc6-7308-a377-400635b2574f", "title": "Save time — and 30% — with my 25 Python, Git, and data science courses!", "url": "https://lernerpython.com/2021/11/26/save-time-and-30-with-my-25-python-git-and-data-science-courses/", "published_at": "2021-11-26T11:57:46+00:00" }, { "id": "01a0bbdc-fdc6-7308-a377-400636ad440f", "title": "Stop fearing Python decorators", "url": "https://lernerpython.com/2021/10/21/stop-fearing-python-decorators/", "published_at": "2021-10-21T19:35:48+00:00" }, { "id": "01a0bbe0-6bcb-73ef-81e5-466f0e25c8f4", "title": "Let’s de-confuse Python objects!", "url": "https://lernerpython.com/2021/09/10/lets-de-confuse-python-objects/", "published_at": "2021-09-10T10:37:06+00:00" }, { "id": "01a0bbe0-6bcb-73ef-81e5-466f0f227c7e", "title": "Missing my blog posts? Check me out on YouTube!", "url": "https://lernerpython.com/2021/09/06/missing-my-blog-posts-check-me-out-on-youtube/", "published_at": "2021-09-06T09:16:49+00:00" }, { "id": "01a0bbe0-6bcb-73ef-81e5-466f0fbef071", "title": "Level up your Python skills with six new courses", "url": "https://lernerpython.com/2021/08/24/level-up-your-python-skills-with-six-new-courses/", "published_at": "2021-08-24T19:15:18+00:00" }, { "id": "01a0bbe0-6bcb-73ef-81e5-466f10b5da31", "title": "Improve your “pandas” skills with “Pandas Workout”", "url": "https://lernerpython.com/2021/08/04/improve-your-pandas-skills-with-pandas-workout/", "published_at": "2021-08-04T12:04:49+00:00" }, { "id": "01a0bbe0-6bcb-73ef-81e5-466f10dfdf68", "title": "Python parameters primer", "url": "https://lernerpython.com/2021/06/07/python-parameters-primer/", "published_at": "2021-06-07T17:30:58+00:00" }, { "id": "01a0bbe0-6bcb-73ef-81e5-466f11ae7c8c", "title": "It’s time to learn Python", "url": "https://lernerpython.com/2021/04/22/its-time-to-learn-python/", "published_at": "2021-04-22T14:54:07+00:00" }, { "id": "01a0bbe0-6bcb-73ef-81e5-466f12acd275", "title": "Write better Python functions!", "url": "https://lernerpython.com/2021/04/20/write-better-python-functions/", "published_at": "2021-04-20T12:22:50+00:00" }, { "id": "01a0bbe0-6bcb-73ef-81e5-466f132571a9", "title": "One year of “Python for non-programmers”", "url": "https://lernerpython.com/2021/03/23/one-year-of-python-for-non-programmers/", "published_at": "2021-03-23T16:48:53+00:00" }, { "id": "01a0bbe0-6bcb-73ef-81e5-466f13caa75f", "title": "Reminder: Weekly Python Exercise B1 (advanced topics 1) starts on Tuesday!", "url": "https://lernerpython.com/2021/02/19/reminder-weekly-python-exercise-b1-advanced-topics-1-starts-on-tuesday/", "published_at": "2021-02-19T14:00:38+00:00" }, { "id": "01a0bbe0-6bcb-73ef-81e5-466f1448dc19", "title": "You can, but should you? Combining some of Python’s more esoteric features", "url": "https://lernerpython.com/2020/12/28/you-can-but-should-you-combining-some-of-pythons-more-esoteric-features/", "published_at": "2020-12-28T19:05:42+00:00" }, { "id": "01a0bbe3-b469-71ed-b5a9-0030a0d8a6f7", "title": "This Black Friday, get 40% off all 25 of my Python, Git, and data science courses", "url": "https://lernerpython.com/2020/11/27/this-black-friday-get-40-off-all-25-of-my-python-git-and-data-science-courses/", "published_at": "2020-11-27T13:13:58+00:00" }, { "id": "01a0bbe3-b469-71ed-b5a9-0030a161a355", "title": "Reminder: My “Intro to SQL” course is this Sunday!", "url": "https://lernerpython.com/2020/11/11/reminder-my-intro-to-sql-course-is-this-sunday/", "published_at": "2020-11-11T14:33:16+00:00" }, { "id": "01a0bbe3-b469-71ed-b5a9-0030a1677b76", "title": "Join the data revolution with my “Intro to SQL” course!", "url": "https://lernerpython.com/2020/10/30/join-the-data-revolution-with-my-intro-to-sql-course/", "published_at": "2020-10-30T02:15:00+00:00" }, { "id": "01a0bbe3-b469-71ed-b5a9-0030a1685061", "title": "Now playing on YouTube: Answers to your Python questions", "url": "https://lernerpython.com/2020/10/28/now-playing-on-youtube-answers-to-your-python-questions/", "published_at": "2020-10-28T07:28:12+00:00" } ] posts Claim your blog

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LernerPython blog, from Reuven Lerner

lernerpython.com

2026

Python division operators: / returns a float, // rounds down original ↗

1 Mar 2026

pandas read_csv header: Which row holds your column names original ↗

28 Feb 2026

Pandas pivot vs pivot_table: Handling duplicate values original ↗

27 Feb 2026

Pandas join vs merge: Combining data frames by index or column original ↗

26 Feb 2026

Pandas agg with a dict: Different aggregations per column original ↗

25 Feb 2026

Pandas groupby agg: Applying multiple aggregations at once original ↗

24 Feb 2026

Pandas na_values: Treating custom strings as missing data original ↗

23 Feb 2026

Python extended unpacking: Using * to assign leftover values original ↗

22 Feb 2026

uv version –bump: Increasing your project’s version number original ↗

21 Feb 2026

Pandas loc vs iloc slicing: Inclusive vs exclusive endpoints original ↗

20 Feb 2026

pandas read_csv: Speed up loading with the PyArrow engine original ↗

19 Feb 2026

Pandas category dtype: Reduce string column memory by 90%original ↗

18 Feb 2026

Python multi-line comprehensions: Formatting for readability original ↗

17 Feb 2026

collections.Counter: Counting values in a Python sequence original ↗

16 Feb 2026

OrderedDict vs dict: Why equality checks compare order original ↗

15 Feb 2026

Sorting custom Python objects with __lt__ and __eq__original ↗

14 Feb 2026

Python str.strip: Removing any characters, not just whitespace original ↗

13 Feb 2026

Dispatch tables in Python: Replace if/elif with a dict of functions original ↗

12 Feb 2026

Python dict insertion order: What happens when you re-add a key original ↗

11 Feb 2026

Python defaultdict: Pass a factory function, not a value original ↗

10 Feb 2026

Python positional-only parameters: Fixing **kwargs conflicts original ↗

9 Feb 2026

Python str.split and rsplit: Splitting strings with maxsplit original ↗

8 Feb 2026

%xmode in IPython: Shortening long Python tracebacks original ↗

7 Feb 2026

Pandas columns overlap error: Fixing join with lsuffix and rsuffix original ↗

6 Feb 2026

Modifying a Python list while iterating: Only append is safe original ↗

5 Feb 2026

Python multiple return values: Returning and unpacking tuples original ↗

4 Feb 2026

__setitem__ in Python: Custom logic for square-bracket assignment original ↗

3 Feb 2026

Python `__getitem__`: Custom logic behind square brackets original ↗

2 Feb 2026

Python __getitem__: Adding bracket notation to your classes original ↗

1 Feb 2026

Pandas join: Why you need a one-column DataFrame, not a Series original ↗

31 Jan 2026

Pandas currency strings: Strip USD, then astype(float) and sum original ↗

30 Jan 2026

Python method calls: Why dict.items needs parentheses original ↗

29 Jan 2026

Pandas 3.0 pd.col: Replacing lambda in loc and assign original ↗

28 Jan 2026

Python from import doesn’t save memory: The module still loads original ↗

27 Jan 2026

What’s new in Pandas 3?original ↗

26 Jan 2026

__new__ vs __init__: Why Python constructors rarely need __new__original ↗

26 Jan 2026

Pandas Series and DataFrame methods: same names, column-wise results original ↗

25 Jan 2026

Reading multi-sheet Excel files in Pandas with sheet_name original ↗

24 Jan 2026

uv python pin: Changing the Python version in .python-version original ↗

23 Jan 2026

Learn to code with AI — not just write prompts original ↗

22 Jan 2026

Unique values from a Python list: Using set() and unpacking original ↗

22 Jan 2026

We’re all VCs now: The skills developers need in the AI era original ↗

21 Jan 2026

Pandas memory usage: Why you need deep=True for text columns original ↗

21 Jan 2026

Build YOUR data dashboard — join my next 8-week HOPPy studio cohort original ↗

21 Jan 2026

Pandas read_csv accepts a URL: Loading remote data files original ↗

20 Jan 2026

Saving a Pandas plot to a file with get_figure and savefig original ↗

19 Jan 2026

Pandas datetime index slicing: sort_index to avoid a KeyError original ↗

18 Jan 2026

Sorting a Python dict by value with operator.itemgetter original ↗

17 Jan 2026

Python file modes: Use ‘x’ instead of ‘w’ to avoid overwriting original ↗

16 Jan 2026

Pandas nlargest: Finding top rows faster than sort_values original ↗

15 Jan 2026

Pandas column arguments: Where one name works, a list does too original ↗

14 Jan 2026

Python str.join(): Why it’s a string method, not a list method original ↗

13 Jan 2026

Pandas sort_values: Sorting a data frame by multiple columns original ↗

12 Jan 2026

Pandas select_dtypes: Selecting columns by their dtype original ↗

11 Jan 2026

Python line continuation: How parentheses split long lines original ↗

10 Jan 2026

Jupyter memory usage: Why del doesn’t free your DataFrame original ↗

9 Jan 2026

Python set subset checks with original ↗

8 Jan 2026

dict.fromkeys: Why a mutable default value gets shared original ↗

7 Jan 2026

Python round and banker’s rounding: Why round(2.5) returns 2 original ↗

6 Jan 2026

Reverse a string or list in Python with the [::-1] slice original ↗

5 Jan 2026

Python sequences: The shared API of str, list, and tuple original ↗

4 Jan 2026

Python weekend check: Detecting Saturday and Sunday with weekday()original ↗

3 Jan 2026

Python is vs ==: Object identity and value equality original ↗

2 Jan 2026

Python numeric literals: Using underscores to group digits original ↗

1 Jan 2026

2025

Reuven’s 2025 in review original ↗

23 Dec 2025

30 things I’ve learned from 30 years as a Python freelancer original ↗

8 Dec 2025

Want to learn uv?original ↗

3 Nov 2025

Your personal mentor for Python and Pandas original ↗

21 Oct 2025

You’re probably using uv wrong original ↗

28 Aug 2025

How to conference original ↗

27 Jul 2025

My newest course: HOPPy (Hands-on Projects in Python)original ↗

13 Mar 2025

Eleven days on Iceland’s Ring Road original ↗

5 Jan 2025

2024

Level up your Python skills this August original ↗

8 Aug 2024

2023

Prepare yourself for a better career, with my new Python learning memberships original ↗

23 Nov 2023

I’m banned for life from advertising on Meta. Because I teach Python.original ↗

19 Oct 2023

Sharpen your Pandas skills with “Bamboo Weekly”original ↗

16 Feb 2023

2022

My Week with ChatGPT original ↗

11 Dec 2022

Improve your Python skills — at 40% off original ↗

24 Nov 2022

Level up your career with PythonDAB — the Python Data Analytics Bootcamp original ↗

14 Nov 2022

Upcoming Python/Pandas courses for seasoned coders original ↗

23 Oct 2022

Lots of new YouTube videos about Python and Pandas!original ↗

21 Oct 2022

How to propose a winning conference talk original ↗

19 Oct 2022

Announcing PythonDAB: The course I’ve always wanted to teach original ↗

24 May 2022

The “why” of object-oriented programming (in Python)original ↗

1 Apr 2022

2021

Save time — and 30% — with my 25 Python, Git, and data science courses!original ↗

26 Nov 2021

Stop fearing Python decorators original ↗

21 Oct 2021

Let’s de-confuse Python objects!original ↗

10 Sept 2021

Missing my blog posts? Check me out on YouTube!original ↗

6 Sept 2021

Level up your Python skills with six new courses original ↗

24 Aug 2021

Improve your “pandas” skills with “Pandas Workout”original ↗

4 Aug 2021

Python parameters primer original ↗

7 Jun 2021

It’s time to learn Python original ↗

22 Apr 2021

Write better Python functions!original ↗

20 Apr 2021

One year of “Python for non-programmers”original ↗

23 Mar 2021

Reminder: Weekly Python Exercise B1 (advanced topics 1) starts on Tuesday!original ↗

19 Feb 2021

2020

You can, but should you? Combining some of Python’s more esoteric features original ↗

28 Dec 2020

This Black Friday, get 40% off all 25 of my Python, Git, and data science courses original ↗

27 Nov 2020

Reminder: My “Intro to SQL” course is this Sunday!original ↗

11 Nov 2020

Join the data revolution with my “Intro to SQL” course!original ↗

30 Oct 2020

Now playing on YouTube: Answers to your Python questions original ↗

28 Oct 2020