no need for .keys()

pyproject.toml

@@ -42,10 +42,10 @@ classifiers = [
     "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
     "Topic :: Scientific/Engineering :: Electronic Design Automation (EDA)",
     ]
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 dynamic = ["version"]
 dependencies = [
-    "klayout~=0.28",
+    "klayout~=0.29",
     ]
 
 
@@ -54,3 +54,40 @@ path = "snarled/__init__.py"
 
 [project.scripts]
 snarled = "snarled.main:main"
+
+
+[tool.ruff]
+exclude = [
+    ".git",
+    "dist",
+    ]
+line-length = 145
+indent-width = 4
+lint.dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
+lint.select = [
+    "NPY", "E", "F", "W", "B", "ANN", "UP", "SLOT", "SIM", "LOG",
+    "C4", "ISC", "PIE", "PT", "RET", "TCH", "PTH", "INT",
+    "ARG", "PL", "R", "TRY",
+    "G010", "G101", "G201", "G202",
+    "Q002", "Q003", "Q004",
+    ]
+lint.ignore = [
+    #"ANN001",   # No annotation
+    "ANN002",   # *args
+    "ANN003",   # **kwargs
+    "ANN401",   # Any
+    "ANN101",   # self: Self
+    "SIM108",   # single-line if / else assignment
+    "RET504",   # x=y+z; return x
+    "PIE790",   # unnecessary pass
+    "ISC003",   # non-implicit string concatenation
+    "C408",     # dict(x=y) instead of {'x': y}
+    "PLR09",    # Too many xxx
+    "PLR2004",  # magic number
+    "PLC0414",  # import x as x
+    "TRY003",   # Long exception message
+    "PTH123",   # open()
+    "UP015",    # open(..., 'rt')
+    "PLW2901",  # overwriting loop var
+    ]
+

snarled/__init__.py

@@ -12,7 +12,10 @@ has deprived the man of a schematic and a better connectivity tool.
 The main functionality is in `trace`.
 `__main__.py` details the command-line interface.
 """
-from .trace import trace_layout, TraceAnalysis
+from .trace import (
+    trace_layout as trace_layout,
+    TraceAnalysis as TraceAnalysis,
+    )
 
 __author__ = 'Jan Petykiewicz'
 __version__ = '1.0'

snarled/trace.py

@@ -1,10 +1,11 @@
-from typing import Sequence, Iterable
+from collections.abc import Sequence, Iterable
 import logging
 from collections import Counter
 from itertools import chain
 
 from klayout import db
 from .types import lnum_t, layer_t
+from .utils import SnarledError
 
 
 logger = logging.getLogger(__name__)
@@ -165,8 +166,8 @@ def trace_layout(
     # Merge labels from a separate layout if asked
     if lfile_path:
         if not lfile_map:
-            raise Exception('Asked to load labels from a separate file, but no '
-                            'label layers were specified in lfile_map')
+            raise SnarledError('Asked to load labels from a separate file, but no '
+                               + 'label layers were specified in lfile_map')
 
         if lfile_layer_map is None:
             lfile_layer_map = layer_map
@@ -199,7 +200,7 @@ def trace_layout(
 
     # Create l2n text layers
     layer2texts = {}
-    for layer in labels_map.keys():
+    for layer in labels_map:
         if isinstance(layer, str):
             layer = layer_map[layer]
         klayer = layout.layer(*layer)
@@ -247,7 +248,7 @@ def trace_layout(
     #
     # Return merged nets
     #
-    top_circuits = [cc for cc, _ in zip(nl.each_circuit_top_down(), range(nl.top_circuit_count()))]
+    top_circuits = [cc for cc, _ in zip(nl.each_circuit_top_down(), range(nl.top_circuit_count()), strict=False)]
 
     # Nets with more than one label get their labels joined with a comma
     nets  = [
@@ -275,9 +276,8 @@ def _get_topcell(
     """
     if name is None:
         return layout.top_cell()
-    else:
-        ind = layout.cell_by_name(name)
-        return layout.cell(ind)
+    ind = layout.cell_by_name(name)
+    return layout.cell(ind)
 
 
 def _write_net_layout(

snarled/utils.py

@@ -5,6 +5,10 @@ from .types import layer_t
 logger = logging.getLogger(__name__)
 
 
+class SnarledError(Exception):
+    pass
+
+
 def strip_underscored_label(string: str) -> str:
     """
     If the label ends in an underscore followed by an integer, strip
@@ -50,18 +54,18 @@ def read_layermap(path: str) -> dict[str, tuple[int, int]]:
 
         for cc in '*-()':
             if cc in line:
-                raise Exception(f'Failed to read layermap on line {nn} due to special character "{cc}"')
+                raise SnarledError(f'Failed to read layermap on line {nn} due to special character "{cc}"')
 
         for cc in ':/':
             if cc not in line:
-                raise Exception(f'Failed to read layermap on line {nn}; missing "{cc}"')
+                raise SnarledError(f'Failed to read layermap on line {nn}; missing "{cc}"')
 
         try:
             layer_part, name = line.split(':')
             layer_nums = str2lnum(layer_part)
-        except Exception as err:
-            logger.error(f'Layer map read failed on line {nn}')
-            raise err
+        except Exception:
+            logger.exception(f'Layer map read failed on line {nn}')
+            raise
 
         layer_map[name.strip()] = layer_nums
 
@@ -101,7 +105,7 @@ def read_connectivity(path: str) -> list[tuple[layer_t, layer_t | None, layer_t]
         parts = line.split(',')
 
         if len(parts) not in (2, 3):
-            raise Exception(f'Too many commas in connectivity spec on line {nn}')
+            raise SnarledError(f'Too many commas in connectivity spec on line {nn}')
 
         layers = []
         for part in parts:
@@ -109,13 +113,13 @@ def read_connectivity(path: str) -> list[tuple[layer_t, layer_t | None, layer_t]
             if '/' in part:
                 try:
                     layer = str2lnum(part)
-                except Exception as err:
-                    logger.error(f'Connectivity spec read failed on line {nn}')
-                    raise err
+                except Exception:
+                    logger.exception(f'Connectivity spec read failed on line {nn}')
+                    raise
             else:
                 layer = part.strip()
                 if not layer:
-                    raise Exception(f'Empty layer in connectivity spec on line {nn}')
+                    raise SnarledError(f'Empty layer in connectivity spec on line {nn}')
             layers.append(layer)
 
         if len(layers) == 2:
@@ -156,7 +160,7 @@ def read_remap(path: str) -> dict[layer_t, layer_t]:
         parts = line.split(':')
 
         if len(parts) != 2:
-            raise Exception(f'Too many commas in layer remap spec on line {nn}')
+            raise SnarledError(f'Too many commas in layer remap spec on line {nn}')
 
         layers = []
         for part in parts:
@@ -164,13 +168,13 @@ def read_remap(path: str) -> dict[layer_t, layer_t]:
             if '/' in part:
                 try:
                     layer = str2lnum(part)
-                except Exception as err:
-                    logger.error(f'Layer remap spec read failed on line {nn}')
-                    raise err
+                except Exception:
+                    logger.exception(f'Layer remap spec read failed on line {nn}')
+                    raise
             else:
                 layer = part.strip()
                 if not layer:
-                    raise Exception(f'Empty layer in layer remap spec on line {nn}')
+                    raise SnarledError(f'Empty layer in layer remap spec on line {nn}')
             layers.append(layer)
 
         remap[layers[0]] = layers[1]