列表理解最佳实践

Question

I'm very very new to python and I'm writing a compiler program for assembly.

An example line of assembly code would be:

@2

The resulting line of machine code with should be 16 bits long, with the msb being '0' to represent '@', and the remaining 15 bits being a binary representation of the decimal following the '@'. Each instruction has already been broken down and correctly formatted into a list.

Currently I am doing the conversion as follow:

rmw = ['0'+f"{int(x[1:]):b}".zfill(15) if x.startswith('@') else x for x in rmw]

This works great, but seems a little bit clunky to me, is this best practice? I think I could probably set zfill to 16, but would rather keep the two parts separate then combine them I think. My background is C programming so this is a bit of a departure.

Answer 1

It seems perfectly fine to me. However, there are two simplifications you can make to shorten it:

1. Include the leading 0 in the f-string so the ugly '0'+ can be excluded.
2. Take advantage of string formatting to pad with zeros directly in the f-string (with 015 ) , avoiding the extra zfill .

rmw = [f"0{int(x[1:]):015b}" if x.startswith('@') else x for x in rmw]