Support relative imports

.flake8

@@ -2,7 +2,7 @@
 # Keep in sync with setup.cfg which is used for source packages.
 
 [flake8]
-ignore = E302, E501
+ignore = E302, E501, W504
 max-line-length = 80
 max-complexity = 12
 select = B,C,E,F,T4,W,B9

flake8_mypy.py

@@ -7,7 +7,6 @@
 import os
 from pathlib import Path
 import re
-from tempfile import NamedTemporaryFile, TemporaryDirectory
 import time
 import traceback
 from typing import (
@@ -163,7 +162,7 @@ class MypyChecker:
 
     tree = attr.ib(default=None)
     filename = attr.ib(default='(none)')
-    lines = attr.ib(default=[])
+    lines = attr.ib(default=[])  # type: List[str]
     options = attr.ib(default=None)
     visitor = attr.ib(default=attr.Factory(lambda: TypingVisitor))
 
@@ -180,18 +179,7 @@ def run(self) -> Iterator[_Flake8Error]:
         if not self.options.mypy_config and 'MYPYPATH' not in os.environ:
             os.environ['MYPYPATH'] = ':'.join(calculate_mypypath())
 
-        # Always put the file in a separate temporary directory to avoid
-        # unexpected clashes with other .py and .pyi files in the same original
-        # directory.
-        with TemporaryDirectory(prefix='flake8mypy_') as d:
-            with NamedTemporaryFile(
-                'w', encoding='utf8', prefix='tmpmypy_', suffix='.py', dir=d
-            ) as f:
-                self.filename = f.name
-                for line in self.lines:
-                    f.write(line)
-                f.flush()
-                yield from self._run()
+        yield from self._run()
 
     def _run(self) -> Iterator[_Flake8Error]:
         mypy_cmdline = self.build_mypy_cmdline(self.filename, self.options.mypy_config)

setup.cfg

@@ -4,7 +4,7 @@ python-tag = py35.py36
 [flake8]
 # Keep in sync with .flake8. This copy here is needed for source packages
 # to be able to pass tests without failing selfclean check.
-ignore = E302, E501
+ignore = E302, E501, W504
 max-line-length = 80
 max-complexity = 12
 select = B,C,E,F,T4,W,B9

tests/test_mypy.py

@@ -67,17 +67,17 @@ def test_invalid_types(self) -> None:
         self.assertEqual(
             errors,
             self.errors(
-                T484(5, 0, vars=('Missing return statement',)),
+                T484(5, 1, vars=('Missing return statement',)),
                 T484(
                     10,
-                    4,
+                    5,
                     vars=(
                         'Incompatible return value type (got "int", expected "str")',
                     ),
                 ),
                 T484(
                     10,
-                    11,
+                    12,
                     vars=(
                         'Unsupported operand types for + ("int" and "str")',
                     ),
@@ -94,7 +94,7 @@ def test_clash(self) -> None:
             self.errors(
                 T484(
                     6,
-                    4,
+                    5,
                     vars=(
                         'Incompatible return value type '
                         '(got "UserDict[<nothing>, <nothing>]", '