simplify repr code

Author: Liam-DeVoe

hypothesis-python/src/hypothesis/strategies/_internal/strings.py

@@ -77,20 +77,21 @@ def from_characters_args(
  intervals &= charmap.intervals_from_codec(codec)
 
  _args = []
- if codec is not None:
- _args.append(("codec", codec))
- if min_codepoint is not None:
- _args.append(("min_codepoint", min_codepoint))
- if max_codepoint is not None:
- _args.append(("max_codepoint", max_codepoint))
  if categories is not None and set(categories) != set(charmap.categories()) - {
  "Cs"
  }:
  _args.append(("categories", categories))
- if exclude_characters not in [None, ""]:
- _args.append(("exclude_characters", exclude_characters))
- if include_characters not in [None, ""]:
- _args.append(("include_characters", include_characters))
+ _args.extend(
+ (k, v)
+ for k, v in [
+ ("codec", codec),
+ ("min_codepoint", min_codepoint),
+ ("max_codepoint", max_codepoint),
+ ("exclude_characters", exclude_characters),
+ ("include_characters", include_characters),
+ ]
+ if v not in (None, "")
+ )
  _arg_repr = ", ".join(f"{k}={v!r}" for k, v in _args)
  if not intervals:
  raise InvalidArgument(