fix style issue found by flake8

[nominatim.git] / src / nominatim_db / tokenizer / token_analysis / generic_mutation.py

diff --git a/src/nominatim_db/tokenizer/token_analysis/generic_mutation.py b/src/nominatim_db/tokenizer/token_analysis/generic_mutation.py
index 03cc63db0a7acbbdfce2cd22e75ecb86f8e6f490..718cc468886af3b329a40a146f79e6435ac6597e 100644 (file)
--- a/src/nominatim_db/tokenizer/token_analysis/generic_mutation.py
+++ b/src/nominatim_db/tokenizer/token_analysis/generic_mutation.py
@@ -12,10 +12,11 @@ import itertools
 import logging
 import re
 
-from nominatim_core.errors import UsageError
+from ...errors import UsageError
 
 LOG = logging.getLogger()
 
+
 def _zigzag(outer: Iterable[str], inner: Iterable[str]) -> Iterator[str]:
     return itertools.chain.from_iterable(itertools.zip_longest(outer, inner, fillvalue=''))
 
@@ -36,7 +37,6 @@ class MutationVariantGenerator:
                       "This is not allowed.", pattern)
             raise UsageError("Bad mutation pattern in configuration.")
 
-
     def generate(self, names: Iterable[str]) -> Iterator[str]:
         """ Generator function for the name variants. 'names' is an iterable
             over a set of names for which the variants are to be generated.
@@ -49,7 +49,6 @@ class MutationVariantGenerator:
                 for seps in self._fillers(len(parts)):
                     yield ''.join(_zigzag(parts, seps))
 
-
     def _fillers(self, num_parts: int) -> Iterator[Tuple[str, ...]]:
         """ Returns a generator for strings to join the given number of string
             parts in all possible combinations.