pyderasn.py            | 14 ++++++++------
 tests/test_pyderasn.py |  7 ++++++-

diff --git a/pyderasn.py b/pyderasn.py
index 0e8674489e7fbe37fc74c19c222dff699cdcc663366bdf374c5bd3f9ebaba66d..dc09dbfb947d6f7ef56538132839b123927e1da89f70a364f86f23cd1fb8f96b 100755
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -1287,10 +1287,12 @@     :returns: memoryview over read-only mmap-ing of the whole file
     """
     return memoryview(mmap(fd.fileno(), 0, prot=PROT_READ))
 
+
 def pureint(value):
     if not set(value) <= DECIMALS:
         raise ValueError("non-pure integer")
     return int(value)
+
 
 def fractions2float(fractions_raw):
     pureint(fractions_raw)
@@ -1304,7 +1306,7 @@     for path, define in defines_by_path:
         if len(path) != len(sub_decode_path):
             continue
         for p1, p2 in zip(path, sub_decode_path):
-            if (not p1 is any) and (p1 != p2):
+            if (p1 is not any) and (p1 != p2):
                 break
         else:
             return define
@@ -1963,7 +1965,7 @@                 if tag_only:
                     yield None
                     return
                 _decode_path, obj, tail = result
-                if not _decode_path is decode_path:
+                if _decode_path is not decode_path:
                     yield result
         else:
             try:
@@ -2005,7 +2007,7 @@                     if tag_only:  # pragma: no cover
                         yield None
                         return
                     _decode_path, obj, tail = result
-                    if not _decode_path is decode_path:
+                    if _decode_path is not decode_path:
                         yield result
                 eoc_expected, tail = tail[:EOC_LEN], tail[EOC_LEN:]
                 if eoc_expected.tobytes() != EOC:
@@ -2044,7 +2046,7 @@                     if tag_only:  # pragma: no cover
                         yield None
                         return
                     _decode_path, obj, tail = result
-                    if not _decode_path is decode_path:
+                    if _decode_path is not decode_path:
                         yield result
                 if obj.tlvlen < l and not ctx.get("allow_expl_oob", False):
                     raise DecodeError(
@@ -3373,7 +3375,7 @@                 LEN1K,
                 int2byte(0),
                 octets[offset:offset + 999],
             )))
-        tail = octets[offset+999:]
+        tail = octets[offset + 999:]
         if len(tail) > 0:
             tail = int2byte((8 - bit_len % 8) % 8) + tail
             write_full(writer, b"".join((
@@ -3833,7 +3835,7 @@                 OctetString.tag_default,
                 LEN1K,
                 octets[offset:offset + 1000],
             )))
-        tail = octets[offset+1000:]
+        tail = octets[offset + 1000:]
         if len(tail) > 0:
             write_full(writer, b"".join((
                 OctetString.tag_default,
diff --git a/tests/test_pyderasn.py b/tests/test_pyderasn.py
index da8db6765e37aee55b3c57b5a68782bc01fb7c6c0daa8b870207d3ab64af3fde..02fcd3347078a95ea0ef04865effdd94ec93d753e2c16b333e4f384a4452e01d 100644
--- a/tests/test_pyderasn.py
+++ b/tests/test_pyderasn.py
@@ -2662,7 +2662,6 @@             self.assertEqual(obj.expl_offset, offset)
             repr(obj)
             list(obj.pps())
 
-
     @given(integers(min_value=1))
     def test_invalid_len(self, l):
         with self.assertRaises(InvalidLength):
@@ -6274,6 +6273,7 @@             integers(min_value=1),
             min_size=len(_schema),
             max_size=len(_schema),
         ))]
+
         class Wahl(Choice):
             schema = (("int", Integer()),)
 
@@ -7046,6 +7046,7 @@         class SeqOf(SequenceOf):
             schema = Integer()
             bounds = (10, 20)
         seqof = None
+
         def gen(n):
             for i in six_xrange(n):
                 yield Integer(i)
@@ -7065,6 +7066,7 @@     def test_iterator_twice(self):
         class SeqOf(SequenceOf):
             schema = Integer()
             bounds = (1, float("+inf"))
+
         def gen():
             for i in six_xrange(10):
                 yield Integer(i)
@@ -7079,6 +7081,7 @@     def test_iterator_2pass(self):
         class SeqOf(SequenceOf):
             schema = Integer()
             bounds = (1, float("+inf"))
+
         def gen():
             for i in six_xrange(10):
                 yield Integer(i)
@@ -7613,6 +7616,7 @@         self.assertEqual(decoded["tgt"].defined[1], Integer(tgt))
 
     def test_remaining_data(self):
         oid = ObjectIdentifier("1.2.3")
+
         class Seq(Sequence):
             schema = (
                 ("oid", ObjectIdentifier(defines=((("tgt",), {
@@ -7630,6 +7634,7 @@             Seq().decode(seq.encode())
 
     def test_remaining_data_seqof(self):
         oid = ObjectIdentifier("1.2.3")
+
         class SeqOf(SetOf):
             schema = OctetString()