Reformat using black (#814)

Makefile

@@ -8,9 +8,14 @@ doc: clean-docs
 	@echo "open file://`pwd`/docs/_build/html/index.html"
 
 isort:
-	isort aiopg
-	isort tests
-	isort examples
+	isort --use-parentheses --multi-line 3 --combine-as --trailing-comma aiopg
+	isort --use-parentheses --multi-line 3 --combine-as --trailing-comma tests
+	isort --use-parentheses --multi-line 3 --combine-as --trailing-comma examples
+
+black:
+	black --line-length 79 aiopg
+	black --line-length 79 tests
+	black --line-length 79 examples
 
 lint: .lint
 
@@ -19,13 +24,18 @@ lint: .lint
 	    $(shell find examples -type f)
 	flake8 aiopg tests examples
 	python setup.py check -rms
-	@if ! isort -c aiopg tests examples; then \
+	@if ! black --line-length 79 --check aiopg tests examples; then \
+            echo "Format errors, run 'make black' to fix them!!!"; \
+            false; \
+	fi
+	@if ! isort --use-parentheses --multi-line 3 --combine-as --trailing-comma -c aiopg tests examples; then \
             echo "Import sort errors, run 'make isort' to fix them!!!"; \
             isort --diff aiopg tests examples; \
             false; \
 	fi
 	@if ! mypy --strict --ignore-missing-imports --exclude sa aiopg; then \
 	    echo "Typing errors"; \
+	    false; \
 	fi
 
 test: flake

aiopg/__init__.py

@@ -3,8 +3,8 @@
 import warnings
 from collections import namedtuple
 
-from .connection import TIMEOUT as DEFAULT_TIMEOUT
 from .connection import (
+    TIMEOUT as DEFAULT_TIMEOUT,
     Connection,
     Cursor,
     DefaultCompiler,
@@ -20,44 +20,53 @@
 from .utils import get_running_loop
 
 warnings.filterwarnings(
-    'always', '.*',
+    "always",
+    ".*",
     category=ResourceWarning,
-    module=r'aiopg(\.\w+)+',
-    append=False
+    module=r"aiopg(\.\w+)+",
+    append=False,
 )
 
-__all__ = ('connect', 'create_pool', 'get_running_loop',
-           'Connection', 'Cursor', 'Pool', 'version', 'version_info',
-           'DEFAULT_TIMEOUT', 'IsolationLevel', 'Transaction')
+__all__ = (
+    "connect",
+    "create_pool",
+    "get_running_loop",
+    "Connection",
+    "Cursor",
+    "Pool",
+    "version",
+    "version_info",
+    "DEFAULT_TIMEOUT",
+    "IsolationLevel",
+    "Transaction",
+)
 
-__version__ = '1.3.0b2'
+__version__ = "1.3.0b2"
 
-version = f'{__version__}, Python {sys.version}'
+version = f"{__version__}, Python {sys.version}"
 
-VersionInfo = namedtuple('VersionInfo',
-                         'major minor micro releaselevel serial')
+VersionInfo = namedtuple(
+    "VersionInfo", "major minor micro releaselevel serial"
+)
 
 
 def _parse_version(ver: str) -> VersionInfo:
     RE = (
-        r'^'
-        r'(?P<major>\d+)\.(?P<minor>\d+)\.(?P<micro>\d+)'
-        r'((?P<releaselevel>[a-z]+)(?P<serial>\d+)?)?'
-        r'$'
+        r"^"
+        r"(?P<major>\d+)\.(?P<minor>\d+)\.(?P<micro>\d+)"
+        r"((?P<releaselevel>[a-z]+)(?P<serial>\d+)?)?"
+        r"$"
     )
     match = re.match(RE, ver)
     if not match:
         raise ImportError(f"Invalid package version {ver}")
     try:
-        major = int(match.group('major'))
-        minor = int(match.group('minor'))
-        micro = int(match.group('micro'))
-        levels = {'rc': 'candidate',
-                  'a': 'alpha',
-                  'b': 'beta',
-                  None: 'final'}
-        releaselevel = levels[match.group('releaselevel')]
-        serial = int(match.group('serial')) if match.group('serial') else 0
+        major = int(match.group("major"))
+        minor = int(match.group("minor"))
+        micro = int(match.group("micro"))
+        levels = {"rc": "candidate", "a": "alpha", "b": "beta", None: "final"}
+        releaselevel = levels[match.group("releaselevel")]
+        serial = int(match.group("serial")) if match.group("serial") else 0
         return VersionInfo(major, minor, micro, releaselevel, serial)
     except Exception as e:
         raise ImportError(f"Invalid package version {ver}") from e
@@ -80,5 +89,5 @@ def _parse_version(ver: str) -> VersionInfo:
     DefaultCompiler,
     ReadCommittedCompiler,
     RepeatableReadCompiler,
-    SerializableCompiler
+    SerializableCompiler,
 )