Understanding "with" and Python's context managers 

Excellent explanation Sir. Thanks for this knowledge.

I've always used the "with" context manager, but mostly because it's "convention" (plus not having to remember to close my file!, or waiting on it to close) I had no idea all the other details. This is great! Thanks Reuven!

good lesson

Why do programmers like dark mode? Because light attracts bugs

I don't understand the trapping exceptions in the __exit__ part. Why did you return True?

I ran the 2 cells in jupyter lab, and it created and wrote the file so quick, I could see all the lines in the file, not sure how yours was delayed?? on windows, running python3.9 Cell1 # I want to write to a file # I can use the "open" to open a file for writing (with the 'w' option) # help(open) f = open('myfile.txt', 'w') f.write('abcde ') f.write('fghij ') f.write('klmnop ') Cell2 # use the Unix "cat" command to view the file !cat myfile.txt Output right away abcde fghij klmnop thanks. Never mind, it seems to be matching what you had now, so much to learn, thanks for always sharing your knowledge.