pylint: avoid explicit use of format() function

Use psycopg2 SQL formatters for SQL and formatted string literals
everywhere else.

nominatim/tools/database_import.py

@@ -234,7 +234,7 @@ def create_search_indices(conn, config, drop=False):
         bad_indices = [row[0] for row in list(cur)]
         for idx in bad_indices:
             LOG.info("Drop invalid index %s.", idx)
-            cur.execute('DROP INDEX "{}"'.format(idx))
+            cur.execute(pysql.SQL('DROP INDEX {}').format(pysql.Identifier(idx)))
     conn.commit()
 
     sql = SQLPreprocessor(conn, config)

nominatim/tools/exec_utils.py

@@ -55,10 +55,10 @@ def run_api_script(endpoint, project_dir, extra_env=None, phpcgi_bin=None,
     query_string = urlencode(params or {})
 
     env = dict(QUERY_STRING=query_string,
-               SCRIPT_NAME='/{}.php'.format(endpoint),
-               REQUEST_URI='/{}.php?{}'.format(endpoint, query_string),
+               SCRIPT_NAME=f'/{endpoint}.php',
+               REQUEST_URI=f'/{endpoint}.php?{query_string}',
                CONTEXT_DOCUMENT_ROOT=webdir,
-               SCRIPT_FILENAME='{}/{}.php'.format(webdir, endpoint),
+               SCRIPT_FILENAME=f'{webdir}/{endpoint}.php',
                HTTP_HOST='localhost',
                HTTP_USER_AGENT='nominatim-tool',
                REMOTE_ADDR='0.0.0.0',

nominatim/tools/migration.py

@@ -9,6 +9,8 @@ Functions for database migration to newer software versions.
 """
 import logging
 
+from psycopg2 import sql as pysql
+
 from nominatim.db import properties
 from nominatim.db.connection import connect
 from nominatim.version import NOMINATIM_VERSION, version_str
@@ -47,7 +49,7 @@ def migrate(config, paths):
         for version, func in _MIGRATION_FUNCTIONS:
             if db_version <= version:
                 LOG.warning("Runnning: %s (%s)", func.__doc__.split('\n', 1)[0],
-                            '{}.{}.{}-{}'.format(*version))
+                            version_str(version))
                 kwargs = dict(conn=conn, config=config, paths=paths)
                 func(**kwargs)
                 conn.commit()
@@ -124,11 +126,12 @@ def add_nominatim_property_table(conn, config, **_):
     """
     if not conn.table_exists('nominatim_properties'):
         with conn.cursor() as cur:
-            cur.execute("""CREATE TABLE nominatim_properties (
-                               property TEXT,
-                               value TEXT);
-                           GRANT SELECT ON TABLE nominatim_properties TO "{}";
-                        """.format(config.DATABASE_WEBUSER))
+            cur.execute(pysql.SQL("""CREATE TABLE nominatim_properties (
+                                        property TEXT,
+                                        value TEXT);
+                                     GRANT SELECT ON TABLE nominatim_properties TO {};
+                                  """)
+                             .format(pysql.Identifier(config.DATABASE_WEBUSER)))
 
 @_migration(3, 6, 0, 0)
 def change_housenumber_transliteration(conn, **_):
@@ -193,7 +196,8 @@ def install_legacy_tokenizer(conn, config, **_):
                                            and column_name = 'token_info'""",
                                         (table, ))
                 if has_column == 0:
-                    cur.execute('ALTER TABLE {} ADD COLUMN token_info JSONB'.format(table))
+                    cur.execute(pysql.SQL('ALTER TABLE {} ADD COLUMN token_info JSONB')
+                                     .format(pysql.Identifier(table)))
         tokenizer = tokenizer_factory.create_tokenizer(config, init_db=False,
                                                        module_name='legacy')
 

nominatim/tools/postcodes.py

@@ -136,13 +136,13 @@ class _CountryPostcodesCollector:
 
 
     def _open_external(self, project_dir):
-        fname = project_dir / '{}_postcodes.csv'.format(self.country)
+        fname = project_dir / f'{self.country}_postcodes.csv'
 
         if fname.is_file():
             LOG.info("Using external postcode file '%s'.", fname)
             return open(fname, 'r')
 
-        fname = project_dir / '{}_postcodes.csv.gz'.format(self.country)
+        fname = project_dir / f'{self.country}_postcodes.csv.gz'
 
         if fname.is_file():
             LOG.info("Using external postcode file '%s'.", fname)

nominatim/tools/refresh.py

@@ -52,16 +52,19 @@ def load_address_levels(conn, table, levels):
     with conn.cursor() as cur:
         cur.drop_table(table)
 
-        cur.execute("""CREATE TABLE {} (country_code varchar(2),
+        cur.execute(pysql.SQL("""CREATE TABLE {} (
+                                        country_code varchar(2),
                                         class TEXT,
                                         type TEXT,
                                         rank_search SMALLINT,
-                                        rank_address SMALLINT)""".format(table))
+                                        rank_address SMALLINT)""")
+                         .format(pysql.Identifier(table)))
 
         cur.execute_values(pysql.SQL("INSERT INTO {} VALUES %s")
                            .format(pysql.Identifier(table)), rows)
 
-        cur.execute('CREATE UNIQUE INDEX ON {} (country_code, class, type)'.format(table))
+        cur.execute(pysql.SQL('CREATE UNIQUE INDEX ON {} (country_code, class, type)')
+                         .format(pysql.Identifier(table)))
 
     conn.commit()
 

nominatim/tools/special_phrases/sp_csv_loader.py

@@ -54,4 +54,4 @@ class SPCsvLoader(Iterator):
         _, extension = os.path.splitext(self.csv_path)
 
         if extension != '.csv':
-            raise UsageError('The file {} is not a csv file.'.format(self.csv_path))
+            raise UsageError(f'The file {self.csv_path} is not a csv file.')

nominatim/tools/special_phrases/sp_importer.py

@@ -16,7 +16,7 @@
 import logging
 import re
 
-from psycopg2.sql import Identifier, Literal, SQL
+from psycopg2.sql import Identifier, SQL
 from nominatim.tools.special_phrases.importer_statistics import SpecialPhrasesImporterStatistics
 
 LOG = logging.getLogger()
@@ -195,35 +195,36 @@ class SPImporter():
         """
         table_name = _classtype_table(phrase_class, phrase_type)
         with self.db_connection.cursor() as db_cursor:
-            db_cursor.execute(SQL("""
-                    CREATE TABLE IF NOT EXISTS {{}} {}
-                    AS SELECT place_id AS place_id,st_centroid(geometry) AS centroid FROM placex
-                    WHERE class = {{}} AND type = {{}}""".format(sql_tablespace))
-                              .format(Identifier(table_name), Literal(phrase_class),
-                                      Literal(phrase_type)))
+            db_cursor.execute(SQL("""CREATE TABLE IF NOT EXISTS {} {} AS
+                                       SELECT place_id AS place_id,
+                                              st_centroid(geometry) AS centroid
+                                       FROM placex
+                                       WHERE class = %s AND type = %s""")
+                                 .format(Identifier(table_name), SQL(sql_tablespace)),
+                              (phrase_class, phrase_type))
 
 
     def _create_place_classtype_indexes(self, sql_tablespace, phrase_class, phrase_type):
         """
             Create indexes on centroid and place_id for the place_classtype table.
         """
-        index_prefix = 'idx_place_classtype_{}_{}_'.format(phrase_class, phrase_type)
+        index_prefix = f'idx_place_classtype_{phrase_class}_{phrase_type}_'
         base_table = _classtype_table(phrase_class, phrase_type)
         # Index on centroid
         if not self.db_connection.index_exists(index_prefix + 'centroid'):
             with self.db_connection.cursor() as db_cursor:
-                db_cursor.execute(SQL("""
-                    CREATE INDEX {{}} ON {{}} USING GIST (centroid) {}""".format(sql_tablespace))
-                                  .format(Identifier(index_prefix + 'centroid'),
-                                          Identifier(base_table)), sql_tablespace)
+                db_cursor.execute(SQL("CREATE INDEX {} ON {} USING GIST (centroid) {}")
+                                     .format(Identifier(index_prefix + 'centroid'),
+                                             Identifier(base_table),
+                                             SQL(sql_tablespace)))
 
         # Index on place_id
         if not self.db_connection.index_exists(index_prefix + 'place_id'):
             with self.db_connection.cursor() as db_cursor:
-                db_cursor.execute(SQL(
-                    """CREATE INDEX {{}} ON {{}} USING btree(place_id) {}""".format(sql_tablespace))
+                db_cursor.execute(SQL("CREATE INDEX {} ON {} USING btree(place_id) {}")
                                   .format(Identifier(index_prefix + 'place_id'),
-                                          Identifier(base_table)))
+                                          Identifier(base_table),
+                                          SQL(sql_tablespace)))
 
 
     def _grant_access_to_webuser(self, phrase_class, phrase_type):