Fixed E731 flake8 errors

do not assign a lambda expression, use a def

6 files changed, 25 insertions, 11 deletions

diff --git a/_pytest/_code/source.py b/_pytest/_code/source.py
index 2ee1c317e..e21fecb1e 100644
--- a/_pytest/_code/source.py
+++ b/_pytest/_code/source.py
@@ -136,7 +136,8 @@ class Source(object):
         try:
             import parser
         except ImportError:
-            syntax_checker = lambda x: compile(x, 'asd', 'exec')
+            def syntax_checker(x):
+                return compile(x, 'asd', 'exec')
         else:
             syntax_checker = parser.suite
 
diff --git a/_pytest/assertion/rewrite.py b/_pytest/assertion/rewrite.py
index 97663ccda..992002b81 100644
--- a/_pytest/assertion/rewrite.py
+++ b/_pytest/assertion/rewrite.py
@@ -39,7 +39,8 @@ ASCII_IS_DEFAULT_ENCODING = sys.version_info[0] < 3
 if sys.version_info >= (3, 5):
     ast_Call = ast.Call
 else:
-    ast_Call = lambda a, b, c: ast.Call(a, b, c, None, None)
+    def ast_Call(a, b, c):
+        return ast.Call(a, b, c, None, None)
 
 
 class AssertionRewritingHook(object):
diff --git a/_pytest/assertion/util.py b/_pytest/assertion/util.py
index c2a5ddee0..41e66448d 100644
--- a/_pytest/assertion/util.py
+++ b/_pytest/assertion/util.py
@@ -111,11 +111,17 @@ def assertrepr_compare(config, op, left, right):
 
     summary = u('%s %s %s') % (ecu(left_repr), op, ecu(right_repr))
 
-    issequence = lambda x: (isinstance(x, (list, tuple, Sequence)) and
-                            not isinstance(x, basestring))
-    istext = lambda x: isinstance(x, basestring)
-    isdict = lambda x: isinstance(x, dict)
-    isset = lambda x: isinstance(x, (set, frozenset))
+    def issequence(x):
+        return (isinstance(x, (list, tuple, Sequence)) and not isinstance(x, basestring))
+
+    def istext(x):
+        return isinstance(x, basestring)
+
+    def isdict(x):
+        return isinstance(x, dict)
+
+    def isset(x):
+        return isinstance(x, (set, frozenset))
 
     def isiterable(obj):
         try:
diff --git a/_pytest/python.py b/_pytest/python.py
index 47759ecee..5b0ebe240 100644
--- a/_pytest/python.py
+++ b/_pytest/python.py
@@ -1415,7 +1415,10 @@ class approx(object):
         # or a sequence of numbers, return a list of ApproxNotIterable objects
         # that can be compared against.
         from collections import Iterable
-        approx_non_iter = lambda x: ApproxNonIterable(x, self.rel, self.abs)
+
+        def approx_non_iter(x):
+            return ApproxNonIterable(x, self.rel, self.abs)
+
         if isinstance(self._expected, Iterable):
             return [approx_non_iter(x) for x in self._expected]
         else:
@@ -1489,7 +1492,8 @@ class ApproxNonIterable(object):
 
     @property
     def tolerance(self):
-        set_default = lambda x, default: x if x is not None else default
+        def set_default(x, default):
+            return x if x is not None else default
 
         # Figure out what the absolute tolerance should be.  ``self.abs`` is
         # either None or a value specified by the user.
diff --git a/testing/test_session.py b/testing/test_session.py
index 39a9769f1..f9eb95f3b 100644
--- a/testing/test_session.py
+++ b/testing/test_session.py
@@ -22,7 +22,10 @@ class SessionTests(object):
         assert len(skipped) == 0
         assert len(passed) == 1
         assert len(failed) == 3
-        end = lambda x: x.nodeid.split("::")[-1]
+
+        def end(x):
+            return x.nodeid.split("::")[-1]
+
         assert end(failed[0]) == "test_one_one"
         assert end(failed[1]) == "test_other"
         itemstarted = reprec.getcalls("pytest_itemcollected")
diff --git a/tox.ini b/tox.ini
index 144fe623d..c6fa445af 100644
--- a/tox.ini
+++ b/tox.ini
@@ -196,6 +196,5 @@ filterwarnings =
     ignore:.*inspect.getargspec.*deprecated, use inspect.signature.*:DeprecationWarning
 
 [flake8]
-ignore = E731
 max-line-length = 120
 exclude = _pytest/vendored_packages/pluggy.py