Bob Belderbos
@bbelderbos.bsky.social
👋 Co-Founder of Pybites
🐍 Python software developer + coach
📘 Love books/ reading
🐍 Python software developer + coach
📘 Love books/ reading
I solved a Bite today and used collections.Counter() 🙂
Good reminder: the right data structure saves a lot of code. 🐍
In this case: apart from a small helper function, you get the top stock by symbol using most_common()
Clean, fast, readable. 🚀
Good reminder: the right data structure saves a lot of code. 🐍
In this case: apart from a small helper function, you get the top stock by symbol using most_common()
Clean, fast, readable. 🚀
November 13, 2025 at 5:29 PM
I solved a Bite today and used collections.Counter() 🙂
Good reminder: the right data structure saves a lot of code. 🐍
In this case: apart from a small helper function, you get the top stock by symbol using most_common()
Clean, fast, readable. 🚀
Good reminder: the right data structure saves a lot of code. 🐍
In this case: apart from a small helper function, you get the top stock by symbol using most_common()
Clean, fast, readable. 🚀
Reposted by Bob Belderbos
One of our PDI clients is building a time tracker app with SQLModel + Flask.
It started simple, then grew as he hit real-world edge cases. That’s where the real dev learning happens:
⏱️ Format times
⛔ Avoid duplicates
🛠️ Handle errors clearly
What are you building this week?
It started simple, then grew as he hit real-world edge cases. That’s where the real dev learning happens:
⏱️ Format times
⛔ Avoid duplicates
🛠️ Handle errors clearly
What are you building this week?
November 13, 2025 at 2:18 PM
One of our PDI clients is building a time tracker app with SQLModel + Flask.
It started simple, then grew as he hit real-world edge cases. That’s where the real dev learning happens:
⏱️ Format times
⛔ Avoid duplicates
🛠️ Handle errors clearly
What are you building this week?
It started simple, then grew as he hit real-world edge cases. That’s where the real dev learning happens:
⏱️ Format times
⛔ Avoid duplicates
🛠️ Handle errors clearly
What are you building this week?
I like #Python books and reading source code for inspiration, but don't underestimate the power of the docs.
This week I learned that uuid now supports v7 and that random + sqlite3 added command-line scripts in recent versions.
This week I learned that uuid now supports v7 and that random + sqlite3 added command-line scripts in recent versions.
November 12, 2025 at 10:39 AM
I like #Python books and reading source code for inspiration, but don't underestimate the power of the docs.
This week I learned that uuid now supports v7 and that random + sqlite3 added command-line scripts in recent versions.
This week I learned that uuid now supports v7 and that random + sqlite3 added command-line scripts in recent versions.
TIL #Python 3.14 comes with uuid6 and -7
And really nice: since 3.12 the uuid module can be executed as a script from the command line 📈 - so with a bit of uv we get to a pretty powerful command 😍 👇
And really nice: since 3.12 the uuid module can be executed as a script from the command line 📈 - so with a bit of uv we get to a pretty powerful command 😍 👇
November 11, 2025 at 11:55 AM
TIL #Python 3.14 comes with uuid6 and -7
And really nice: since 3.12 the uuid module can be executed as a script from the command line 📈 - so with a bit of uv we get to a pretty powerful command 😍 👇
And really nice: since 3.12 the uuid module can be executed as a script from the command line 📈 - so with a bit of uv we get to a pretty powerful command 😍 👇
August 11, 2025 at 10:40 AM
Haven't been here in a while? What's happening?
July 23, 2025 at 12:44 PM
Haven't been here in a while? What's happening?
Thanks for joining us 🎧 @tiangolo.com 🎉 and for all you do with @fastapi.tiangolo.com, other libs, and now FastAPI Cloud 😍
It will be so nice to deploy FastAPI apps with just: `fastapi deploy` 🚀
www.youtube.com/watch?v=Q_8a...
It will be so nice to deploy FastAPI apps with just: `fastapi deploy` 🚀
www.youtube.com/watch?v=Q_8a...
Pybites Podcast 191: Code, click, cloud - how Sebastián Ramírez is taking FastAPI to the next level
YouTube video by Pybites
www.youtube.com
May 27, 2025 at 5:13 PM
Thanks for joining us 🎧 @tiangolo.com 🎉 and for all you do with @fastapi.tiangolo.com, other libs, and now FastAPI Cloud 😍
It will be so nice to deploy FastAPI apps with just: `fastapi deploy` 🚀
www.youtube.com/watch?v=Q_8a...
It will be so nice to deploy FastAPI apps with just: `fastapi deploy` 🚀
www.youtube.com/watch?v=Q_8a...
I've completed "Build unix' wc program in python" on @pybites.bsky.social 🐍🎉 - pybitesplatform.com/bites/build-...
Pybites Platform | Master Python Through Hands-On Coding
Overwhelmed by tutorials? Stop consuming books and courses! Confidence will come through a lot of deliberate practice. Our platform helps you master Python and grasp Pythonic best practices.
pybitesplatform.com
May 27, 2025 at 5:11 PM
I've completed "Build unix' wc program in python" on @pybites.bsky.social 🐍🎉 - pybitesplatform.com/bites/build-...
snakeviz == nice for profiling + visualizing 💡 💪 🐍
uv run python -m cProfile -o profile.out -m script_or_package
uv add --dev snakeviz
uv run snakeviz profile.out
(Screenshot: me profiling slow Pandas code as a candidate to refactor using Polars 🔥)
#python #debugging
uv run python -m cProfile -o profile.out -m script_or_package
uv add --dev snakeviz
uv run snakeviz profile.out
(Screenshot: me profiling slow Pandas code as a candidate to refactor using Polars 🔥)
#python #debugging
May 9, 2025 at 3:51 PM
snakeviz == nice for profiling + visualizing 💡 💪 🐍
uv run python -m cProfile -o profile.out -m script_or_package
uv add --dev snakeviz
uv run snakeviz profile.out
(Screenshot: me profiling slow Pandas code as a candidate to refactor using Polars 🔥)
#python #debugging
uv run python -m cProfile -o profile.out -m script_or_package
uv add --dev snakeviz
uv run snakeviz profile.out
(Screenshot: me profiling slow Pandas code as a candidate to refactor using Polars 🔥)
#python #debugging
I've completed "Pybites date generator" on @pybites.bsky.social 🐍🎉 - pybitesplatform.com/bites/pybite...
#python
#python
Pybites Platform | Master Python Through Hands-On Coding
Overwhelmed by tutorials? Stop consuming books and courses! Confidence will come through a lot of deliberate practice. Our platform helps you master Python and grasp Pythonic best practices.
pybitesplatform.com
May 9, 2025 at 3:48 PM
I've completed "Pybites date generator" on @pybites.bsky.social 🐍🎉 - pybitesplatform.com/bites/pybite...
#python
#python
🚀 Built a #Streamlit front-end on top of a #FastAPI backend for our next cohort (starting next week!) 🚀
Great stack for quickly prototyping a front-end, all #Python, no JS 😎
(For more serious web apps you definitely want JS and/or htmlx though 💡)
Great stack for quickly prototyping a front-end, all #Python, no JS 😎
(For more serious web apps you definitely want JS and/or htmlx though 💡)
May 6, 2025 at 4:43 PM
🚀 Built a #Streamlit front-end on top of a #FastAPI backend for our next cohort (starting next week!) 🚀
Great stack for quickly prototyping a front-end, all #Python, no JS 😎
(For more serious web apps you definitely want JS and/or htmlx though 💡)
Great stack for quickly prototyping a front-end, all #Python, no JS 😎
(For more serious web apps you definitely want JS and/or htmlx though 💡)
7 adjacent skills that made me a better #developer (early on):
💻 Vim + CLI
🛠 Support/troubleshooting
🚢 Building complete apps
✍️ Writing/blogging
✅ Automating tasks
🔁 Git
🤝 Mentoring/teaching
Code is just the start. These built the real foundation.
#developers #python
💻 Vim + CLI
🛠 Support/troubleshooting
🚢 Building complete apps
✍️ Writing/blogging
✅ Automating tasks
🔁 Git
🤝 Mentoring/teaching
Code is just the start. These built the real foundation.
#developers #python
May 2, 2025 at 10:03 AM
7 adjacent skills that made me a better #developer (early on):
💻 Vim + CLI
🛠 Support/troubleshooting
🚢 Building complete apps
✍️ Writing/blogging
✅ Automating tasks
🔁 Git
🤝 Mentoring/teaching
Code is just the start. These built the real foundation.
#developers #python
💻 Vim + CLI
🛠 Support/troubleshooting
🚢 Building complete apps
✍️ Writing/blogging
✅ Automating tasks
🔁 Git
🤝 Mentoring/teaching
Code is just the start. These built the real foundation.
#developers #python
#vibecoding, is it doing more harm than good?
April 29, 2025 at 1:40 PM
#vibecoding, is it doing more harm than good?
TIL about the 🔥 chardet library — it guesses unknown file encodings!
📄 Write text in latin-1 ➡️ try to read as utf-8 ➡️ 💥 UnicodeDecodeError.
👨💻 Solution:
📄 Write text in latin-1 ➡️ try to read as utf-8 ➡️ 💥 UnicodeDecodeError.
👨💻 Solution:
April 29, 2025 at 10:09 AM
TIL about the 🔥 chardet library — it guesses unknown file encodings!
📄 Write text in latin-1 ➡️ try to read as utf-8 ➡️ 💥 UnicodeDecodeError.
👨💻 Solution:
📄 Write text in latin-1 ➡️ try to read as utf-8 ➡️ 💥 UnicodeDecodeError.
👨💻 Solution:
🚀 Build real software, not just more tutorials.
Join our 6-week Pybites Developer Cohort (PDC Professional) and ship a real app:
✅ Clean arch + TDD
✅ CLI + FastAPI
✅ CI/CD + Cloud deploy
✅ Portfolio-ready repo
Start May 12 → pybitescoaching.com
Join our 6-week Pybites Developer Cohort (PDC Professional) and ship a real app:
✅ Clean arch + TDD
✅ CLI + FastAPI
✅ CI/CD + Cloud deploy
✅ Portfolio-ready repo
Start May 12 → pybitescoaching.com
Pybites Developer Cohort (PDC) Coaching
pybitescoaching.com
April 29, 2025 at 7:46 AM
🚀 Build real software, not just more tutorials.
Join our 6-week Pybites Developer Cohort (PDC Professional) and ship a real app:
✅ Clean arch + TDD
✅ CLI + FastAPI
✅ CI/CD + Cloud deploy
✅ Portfolio-ready repo
Start May 12 → pybitescoaching.com
Join our 6-week Pybites Developer Cohort (PDC Professional) and ship a real app:
✅ Clean arch + TDD
✅ CLI + FastAPI
✅ CI/CD + Cloud deploy
✅ Portfolio-ready repo
Start May 12 → pybitescoaching.com
𝟱 𝗰𝗼𝗼𝗹 𝘄𝗮𝘆𝘀 to use the underscore in #Python 🐍💡
• Ignore 𝘃𝗮𝗹𝘂𝗲𝘀 when unpacking
• Loop 𝗽𝗹𝗮𝗰𝗲𝗵𝗼𝗹𝗱𝗲𝗿
• Access 𝗹𝗮𝘀𝘁 𝗿𝗲𝘀𝘂𝗹𝘁 in REPL
• Format 𝗹𝗮𝗿𝗴𝗲 𝗻𝘂𝗺𝗯𝗲𝗿𝘀
• Define "𝗽𝗿𝗶𝘃𝗮𝘁𝗲" methods (convention)
See below 👇
• Ignore 𝘃𝗮𝗹𝘂𝗲𝘀 when unpacking
• Loop 𝗽𝗹𝗮𝗰𝗲𝗵𝗼𝗹𝗱𝗲𝗿
• Access 𝗹𝗮𝘀𝘁 𝗿𝗲𝘀𝘂𝗹𝘁 in REPL
• Format 𝗹𝗮𝗿𝗴𝗲 𝗻𝘂𝗺𝗯𝗲𝗿𝘀
• Define "𝗽𝗿𝗶𝘃𝗮𝘁𝗲" methods (convention)
See below 👇
April 25, 2025 at 2:05 PM
𝟱 𝗰𝗼𝗼𝗹 𝘄𝗮𝘆𝘀 to use the underscore in #Python 🐍💡
• Ignore 𝘃𝗮𝗹𝘂𝗲𝘀 when unpacking
• Loop 𝗽𝗹𝗮𝗰𝗲𝗵𝗼𝗹𝗱𝗲𝗿
• Access 𝗹𝗮𝘀𝘁 𝗿𝗲𝘀𝘂𝗹𝘁 in REPL
• Format 𝗹𝗮𝗿𝗴𝗲 𝗻𝘂𝗺𝗯𝗲𝗿𝘀
• Define "𝗽𝗿𝗶𝘃𝗮𝘁𝗲" methods (convention)
See below 👇
• Ignore 𝘃𝗮𝗹𝘂𝗲𝘀 when unpacking
• Loop 𝗽𝗹𝗮𝗰𝗲𝗵𝗼𝗹𝗱𝗲𝗿
• Access 𝗹𝗮𝘀𝘁 𝗿𝗲𝘀𝘂𝗹𝘁 in REPL
• Format 𝗹𝗮𝗿𝗴𝗲 𝗻𝘂𝗺𝗯𝗲𝗿𝘀
• Define "𝗽𝗿𝗶𝘃𝗮𝘁𝗲" methods (convention)
See below 👇
Potentially underused #Python 🐍 feature: 𝘀𝗲𝘁 𝗼𝗽𝗲𝗿𝗮𝘁𝗶𝗼𝗻𝘀 💡
Here's an example how we can remove or update tags, casting new + old into sets, then performing 𝘴𝘦𝘵 𝘰𝘱𝘦𝘳𝘢𝘵𝘪𝘰𝘯𝘴 🔥
Have you used them, how? 😍
(Still on the fence about 𝘸𝘢𝘭𝘳𝘶𝘴, but couldn't bear doing 𝘴𝘵𝘳𝘪𝘱() twice 😅)
Here's an example how we can remove or update tags, casting new + old into sets, then performing 𝘴𝘦𝘵 𝘰𝘱𝘦𝘳𝘢𝘵𝘪𝘰𝘯𝘴 🔥
Have you used them, how? 😍
(Still on the fence about 𝘸𝘢𝘭𝘳𝘶𝘴, but couldn't bear doing 𝘴𝘵𝘳𝘪𝘱() twice 😅)
April 25, 2025 at 6:16 AM
Potentially underused #Python 🐍 feature: 𝘀𝗲𝘁 𝗼𝗽𝗲𝗿𝗮𝘁𝗶𝗼𝗻𝘀 💡
Here's an example how we can remove or update tags, casting new + old into sets, then performing 𝘴𝘦𝘵 𝘰𝘱𝘦𝘳𝘢𝘵𝘪𝘰𝘯𝘴 🔥
Have you used them, how? 😍
(Still on the fence about 𝘸𝘢𝘭𝘳𝘶𝘴, but couldn't bear doing 𝘴𝘵𝘳𝘪𝘱() twice 😅)
Here's an example how we can remove or update tags, casting new + old into sets, then performing 𝘴𝘦𝘵 𝘰𝘱𝘦𝘳𝘢𝘵𝘪𝘰𝘯𝘴 🔥
Have you used them, how? 😍
(Still on the fence about 𝘸𝘢𝘭𝘳𝘶𝘴, but couldn't bear doing 𝘴𝘵𝘳𝘪𝘱() twice 😅)
Seems pydantic validators don't hit with sqlmodel table=True - have you hit this and if so, how have you added validation to your model (e.g. min length field = N characters)?
April 24, 2025 at 8:15 AM
Seems pydantic validators don't hit with sqlmodel table=True - have you hit this and if so, how have you added validation to your model (e.g. min length field = N characters)?
Making a temporary file/dur is very useful for 𝘁𝗲𝘀𝘁𝗶𝗻𝗴.
In the example below, we first use 𝘛𝘦𝘮𝘱𝘰𝘳𝘢𝘳𝘺𝘋𝘪𝘳𝘦𝘤𝘵𝘰𝘳𝘺 to create 5 temp files.
This is a great example of using a 𝗰𝗼𝗻𝘁𝗲𝘅𝘁 𝗺𝗮𝗻𝗮𝗴𝗲𝗿 — a clean way to automatically clean up resources.
pytest makes it even easier using the 𝘵𝘮𝘱_𝘱𝘢𝘵𝘩 fixture:
In the example below, we first use 𝘛𝘦𝘮𝘱𝘰𝘳𝘢𝘳𝘺𝘋𝘪𝘳𝘦𝘤𝘵𝘰𝘳𝘺 to create 5 temp files.
This is a great example of using a 𝗰𝗼𝗻𝘁𝗲𝘅𝘁 𝗺𝗮𝗻𝗮𝗴𝗲𝗿 — a clean way to automatically clean up resources.
pytest makes it even easier using the 𝘵𝘮𝘱_𝘱𝘢𝘵𝘩 fixture:
![import os
from pathlib import Path
from tempfile import TemporaryDirectory
import pytest
def count_dirs_and_files(directory_path: str = '.' ) -> tuple[int, int]:
"""Function for counting dirs and files in a directory."""
dirs, files = 0, 0
for _, directories, filenames in os.walk(directory_path):
dirs += len(directories)
files += len(filenames)
return dirs, files
def test_only_files():
with TemporaryDirectory(dir="/tmp") as dirname:
for i in range(1, 6):
(Path(dirname) / f'{i}.txt').write_text('hello')
assert count_dirs_and_files(dirname) == (0, 5)
# refactored using pytest's tmp_path fixture + parametrize
@pytest.mark.parametrize("num_files", [1, 5, 10])
def test_only_files_param(tmp_path, num_files):
for i in range(1, num_files + 1):
(tmp_path / f'{i}.txt').write_text('hello')
assert count_dirs_and_files(tmp_path) == (0, num_files)](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:uay2bzai5qhnwqcqz7ivsvzg/bafkreiek6n5hqufscypuha47rm6aqb3rkjnjrqsezjna5ayjarf63wzybq@jpeg)
April 23, 2025 at 9:14 AM
Making a temporary file/dur is very useful for 𝘁𝗲𝘀𝘁𝗶𝗻𝗴.
In the example below, we first use 𝘛𝘦𝘮𝘱𝘰𝘳𝘢𝘳𝘺𝘋𝘪𝘳𝘦𝘤𝘵𝘰𝘳𝘺 to create 5 temp files.
This is a great example of using a 𝗰𝗼𝗻𝘁𝗲𝘅𝘁 𝗺𝗮𝗻𝗮𝗴𝗲𝗿 — a clean way to automatically clean up resources.
pytest makes it even easier using the 𝘵𝘮𝘱_𝘱𝘢𝘵𝘩 fixture:
In the example below, we first use 𝘛𝘦𝘮𝘱𝘰𝘳𝘢𝘳𝘺𝘋𝘪𝘳𝘦𝘤𝘵𝘰𝘳𝘺 to create 5 temp files.
This is a great example of using a 𝗰𝗼𝗻𝘁𝗲𝘅𝘁 𝗺𝗮𝗻𝗮𝗴𝗲𝗿 — a clean way to automatically clean up resources.
pytest makes it even easier using the 𝘵𝘮𝘱_𝘱𝘢𝘵𝘩 fixture:
'Scratch your own itch' is a good driver to build stuff. 💪
And even trivial things can lead to interesting projects. 💡
See this emoji searcher project for example, I still use this every day to find + copy emojis 🚀
github.com/bbelderbos/e...
What are you building with #Python?
And even trivial things can lead to interesting projects. 💡
See this emoji searcher project for example, I still use this every day to find + copy emojis 🚀
github.com/bbelderbos/e...
What are you building with #Python?
GitHub - bbelderbos/emojisearcher: No more google search, copy emojis to the clipboard.
No more google search, copy emojis to the clipboard. - bbelderbos/emojisearcher
github.com
April 18, 2025 at 8:19 AM
'Scratch your own itch' is a good driver to build stuff. 💪
And even trivial things can lead to interesting projects. 💡
See this emoji searcher project for example, I still use this every day to find + copy emojis 🚀
github.com/bbelderbos/e...
What are you building with #Python?
And even trivial things can lead to interesting projects. 💡
See this emoji searcher project for example, I still use this every day to find + copy emojis 🚀
github.com/bbelderbos/e...
What are you building with #Python?
Becoming a proficient #Python dev isn’t just about syntax, it’s about building usable apps with clean, testable, well-structured code.
That’s what we coach in our 6-week cohort starting next month.
Real apps. Real feedback. Real growth. 💪
More info: pybitescoaching.com
That’s what we coach in our 6-week cohort starting next month.
Real apps. Real feedback. Real growth. 💪
More info: pybitescoaching.com
April 17, 2025 at 3:20 PM
Becoming a proficient #Python dev isn’t just about syntax, it’s about building usable apps with clean, testable, well-structured code.
That’s what we coach in our 6-week cohort starting next month.
Real apps. Real feedback. Real growth. 💪
More info: pybitescoaching.com
That’s what we coach in our 6-week cohort starting next month.
Real apps. Real feedback. Real growth. 💪
More info: pybitescoaching.com