diff --git a/bench/skip.py b/bench/skip.py
index 25559cc271e..2fc8240e565 100644
--- a/bench/skip.py
+++ b/bench/skip.py
@@ -2,7 +2,6 @@
 
 import pytest
 
-
 SKIP = True
 
 
diff --git a/setup.py b/setup.py
index f5150243a64..89e48c6b579 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,6 @@
 
 from setuptools import setup
 
-
 # TODO: if py gets upgrade to >=1.6,
 #       remove _width_of_current_line in terminal.py
 INSTALL_REQUIRES = [
diff --git a/src/_pytest/assertion/truncate.py b/src/_pytest/assertion/truncate.py
index d19c8b61eee..69d6acdef80 100644
--- a/src/_pytest/assertion/truncate.py
+++ b/src/_pytest/assertion/truncate.py
@@ -12,7 +12,6 @@
 
 import six
 
-
 DEFAULT_MAX_LINES = 8
 DEFAULT_MAX_CHARS = 8 * 80
 USAGE_MSG = "use '-vv' to show"
diff --git a/src/_pytest/deprecated.py b/src/_pytest/deprecated.py
index 4afde69020a..6134ca77b33 100644
--- a/src/_pytest/deprecated.py
+++ b/src/_pytest/deprecated.py
@@ -16,7 +16,6 @@
 from _pytest.warning_types import RemovedInPytest4Warning
 from _pytest.warning_types import UnformattedWarning
 
-
 YIELD_TESTS = "yield tests were removed in pytest 4.0 - {name} will be ignored"
 
 
diff --git a/src/_pytest/hookspec.py b/src/_pytest/hookspec.py
index 3b6c9a7d15a..0641e3bc5ac 100644
--- a/src/_pytest/hookspec.py
+++ b/src/_pytest/hookspec.py
@@ -3,7 +3,6 @@
 
 from _pytest.deprecated import PYTEST_LOGWARNING
 
-
 hookspec = HookspecMarker("pytest")
 
 # -------------------------------------------------------------------------
diff --git a/src/_pytest/logging.py b/src/_pytest/logging.py
index 7e906deab87..22db4430102 100644
--- a/src/_pytest/logging.py
+++ b/src/_pytest/logging.py
@@ -15,7 +15,6 @@
 from _pytest.config import create_terminal_writer
 from _pytest.pathlib import Path
 
-
 DEFAULT_LOG_FORMAT = "%(filename)-25s %(lineno)4d %(levelname)-8s %(message)s"
 DEFAULT_LOG_DATE_FORMAT = "%H:%M:%S"
 
diff --git a/src/_pytest/main.py b/src/_pytest/main.py
index 6e639d8727c..d8478d4fc51 100644
--- a/src/_pytest/main.py
+++ b/src/_pytest/main.py
@@ -24,7 +24,6 @@
 from _pytest.outcomes import exit
 from _pytest.runner import collect_one_node
 
-
 # exitcodes for the command line
 EXIT_OK = 0
 EXIT_TESTSFAILED = 1
diff --git a/src/_pytest/mark/structures.py b/src/_pytest/mark/structures.py
index c8a25d156f8..d65d8b9d806 100644
--- a/src/_pytest/mark/structures.py
+++ b/src/_pytest/mark/structures.py
@@ -12,7 +12,6 @@
 from ..compat import NOTSET
 from _pytest.outcomes import fail
 
-
 EMPTY_PARAMETERSET_OPTION = "empty_parameter_set_mark"
 
 
diff --git a/src/_pytest/pathlib.py b/src/_pytest/pathlib.py
index 5ecdd6026bc..5dd00e74fce 100644
--- a/src/_pytest/pathlib.py
+++ b/src/_pytest/pathlib.py
@@ -19,7 +19,6 @@
 
 from .compat import PY36
 
-
 if PY36:
     from pathlib import Path, PurePath
 else:
diff --git a/testing/code/test_source.py b/testing/code/test_source.py
index fc5eaed0416..965838dae22 100644
--- a/testing/code/test_source.py
+++ b/testing/code/test_source.py
@@ -16,7 +16,6 @@
 import pytest
 from _pytest._code import Source
 
-
 astonly = pytest.mark.nothing
 failsonjython = pytest.mark.xfail("sys.platform.startswith('java')")
 
diff --git a/testing/example_scripts/perf_examples/collect_stats/generate_folders.py b/testing/example_scripts/perf_examples/collect_stats/generate_folders.py
index 94b3f013fd8..ff1eaf7d6bb 100644
--- a/testing/example_scripts/perf_examples/collect_stats/generate_folders.py
+++ b/testing/example_scripts/perf_examples/collect_stats/generate_folders.py
@@ -1,7 +1,6 @@
 import argparse
 import pathlib
 
-
 HERE = pathlib.Path(__file__).parent
 TEST_CONTENT = (HERE / "template_test.py").read_bytes()
 
diff --git a/testing/test_resultlog.py b/testing/test_resultlog.py
index 2c5175246d2..aba5713af52 100644
--- a/testing/test_resultlog.py
+++ b/testing/test_resultlog.py
@@ -12,7 +12,6 @@
 from _pytest.resultlog import pytest_unconfigure
 from _pytest.resultlog import ResultLog
 
-
 pytestmark = pytest.mark.filterwarnings("ignore:--result-log is deprecated")
 
 
diff --git a/testing/test_warnings.py b/testing/test_warnings.py
index 984aae027e4..1b4231edc5b 100644
--- a/testing/test_warnings.py
+++ b/testing/test_warnings.py
@@ -8,7 +8,6 @@
 
 import pytest
 
-
 WARNINGS_SUMMARY_HEADER = "warnings summary"
 
 
diff --git a/tox.ini b/tox.ini
index 16dbaed90a6..997e98c2c09 100644
--- a/tox.ini
+++ b/tox.ini
@@ -205,6 +205,14 @@ filterwarnings =
     # Do not cause SyntaxError for invalid escape sequences in py37.
     default:invalid escape sequence:DeprecationWarning
 pytester_example_dir = testing/example_scripts
+
 [flake8]
 max-line-length = 120
 ignore = E203,W503
+
+[isort]
+; This config mimics what reorder-python-imports does.
+force_single_line = 1
+known_localfolder = pytest,_pytest
+known_third_party = test_source,test_excinfo
+force_alphabetical_sort_within_sections = 1