Hi folks,
Here is an easy way to run system commands in Python and get the output. It is by using subprocess.getoutput command. E.g.
import subprocess
output = subprocess.getoutput("ls -l ~")
print(output)
That’s all for now. Till next time, happy software development.
Hi folks,
In this post we discuss how to fix an error you may come across when you run import
psycopg2. You may come across this error if you have recently updated openssl to a version greater than 1.0.0 on Mac OS.
The error looks like
File "/Users/someuser/.virtualenvs/top_games/lib/python3.7/site-packages/sqlalchemy/dialects/postgresql/psycopg2.py", line 737, in dbapi
import psycopg2
File "/Users/someuser/.virtualenvs/top_games/lib/python3.7/site-packages/psycopg2/__init__.py", line 50, in
from psycopg2._psycopg import ( # noqa
ImportError: dlopen(/Users/someuser/.virtualenvs/top_games/lib/python3.7/site-packages/psycopg2/_psycopg.cpython-37m-darwin.so, 2): Library not loaded: /usr/local/opt/openssl/lib/libssl.1.0.0.dylib
Referenced from: /Users/someuser/.virtualenvs/top_games/lib/python3.7/site-packages/psycopg2/_psycopg.cpython-37m-darwin.so
Reason: image not found
Here is how to fix it:
Activate your project’s virtual environment.
Update psycopg2 using the command:
pip install psycopg2 --upgrade
If you come across an error like
ld: library not found for -lssl
then run the following two commands in your terminal
export LDFLAGS="-L/usr/local/opt/openssl/lib" export CPPFLAGS="-I/usr/local/opt/openssl/include"
Then, try the aforementioned pip command once more.
That’s it. Once psycopg2 is upgraded, the import issue should be fixed.
Hi folks,
If you have done a lot of debugging with ipdb on Python projects in a windows environment using tools like Git bash, you may notice that it’s not very easy to exit ipdb. Pressing familiar keys like Ctrl + c doesn’t work. Here’s how to exit ipdb in Windows:
Run the following command
import os; os._exit(0)
That’s all for now. Till next time.
Hi folks,
In this post I talk about how to pip install Python projects from source.
Let’s say you have a project that you can normally install via pip using a command like pip install someproject, but you want to make some customization to the project.
Here’s how to go about it.
pip install -e .
pip install -e . -U
That’s all for now. Happy software development.