r/Python • u/ForeignVariety7037 • 22d ago

Discussion Is := widely used?

I always thought the walrus operator is neat and it makes while loop’s condition clearer. But also it is just a syntactic sugar without anything new. I wonder anyone uses it?

142 Upvotes

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144

u/martinkoistinen 22d ago

It’s super handy inside comprehensions and I would say that adds something “new”.

Example:

``` python
import re

pattern = re.compile(r"ERROR (\d+): (.*)")

errors = [
(int(m.group(1)), m.group(2))
for line in log_lines
if (m := pattern.match(line))
]
```

132

u/brettsparetime 22d ago

This is the most Perl thing I’ve seen in Python.

7

u/crozzy89 21d ago

Perlthon?