treyhunner, 10 months ago

Python tip 💡

If you just ran an expression in the #Python REPL and you'd like to capture its value into a variable, you don't need to run it again!

You can use the _ variable to get the value of the last REPL output!

You'll also sometimes see _ used as a throwaway variable:

>>> from random import randint
>>> numbers = [randint(1, 5) for _ in range(10)]

_ works in the built-in Python REPL and pretty much all third-party REPLs.

Try _ out yourself in a REPL: https://pym.dev/repl

random.randint used in a list comprehension to generate a range with _ used as a throwaway variable. See code at https://pym.dev/p/3328x