diff --git a/OpenSSL/SSL.py b/OpenSSL/SSL.py
index b83f4b8..ef37fd2 100644
--- a/OpenSSL/SSL.py
+++ b/OpenSSL/SSL.py
@@ -291,9 +291,9 @@
                 protolist = []
                 while instr:
                     l = indexbytes(instr, 0)
-                    proto = instr[1:l+1]
+                    proto = instr[1:l + 1]
                     protolist.append(proto)
-                    instr = instr[l+1:]
+                    instr = instr[l + 1:]
 
                 # Call the callback
                 outstr = callback(conn, protolist)
diff --git a/OpenSSL/_util.py b/OpenSSL/_util.py
index 0cc34d8..b3ea8f7 100644
--- a/OpenSSL/_util.py
+++ b/OpenSSL/_util.py
@@ -41,9 +41,9 @@
         if error == 0:
             break
         errors.append((
-                text(lib.ERR_lib_error_string(error)),
-                text(lib.ERR_func_error_string(error)),
-                text(lib.ERR_reason_error_string(error))))
+            text(lib.ERR_lib_error_string(error)),
+            text(lib.ERR_func_error_string(error)),
+            text(lib.ERR_reason_error_string(error))))
 
     raise exception_type(errors)
 
@@ -104,6 +104,7 @@
     text_type.__name__ + " for {0} is no longer accepted, use bytes"
 )
 
+
 def text_to_bytes_and_warn(label, obj):
     """
     If ``obj`` is text, emit a warning that it should be bytes instead and try
diff --git a/OpenSSL/crypto.py b/OpenSSL/crypto.py
index a52862c..446f7f8 100644
--- a/OpenSSL/crypto.py
+++ b/OpenSSL/crypto.py
@@ -1578,7 +1578,7 @@
         Convert an OpenSSL native context error failure into a Python
         exception.
 
-        When a call to native OpenSSL X509_verify_cert fails, additonal information
+        When a call to native OpenSSL X509_verify_cert fails, additional information
         about the failure can be obtained from the store context.
         """
         errors = [
@@ -1616,7 +1616,7 @@
 
         :param store_ctx: The :py:class:`X509StoreContext` to verify.
 
-        :raises X509StoreContextError: If an error occured when validating a
+        :raises X509StoreContextError: If an error occurred when validating a
           certificate in the context. Sets ``certificate`` attribute to indicate
           which certificate caused the error.
         """
@@ -1784,7 +1784,7 @@
         b"cessationOfOperation",
         b"certificateHold",
         # b"removeFromCRL",
-        ]
+    ]
 
     def __init__(self):
         revoked = _lib.X509_REVOKED_new()
diff --git a/OpenSSL/rand.py b/OpenSSL/rand.py
index 3adf693..27d9f7e 100644
--- a/OpenSSL/rand.py
+++ b/OpenSSL/rand.py
@@ -26,6 +26,7 @@
 
 _builtin_bytes = bytes
 
+
 def bytes(num_bytes):
     """
     Get some random bytes as a string.
diff --git a/OpenSSL/test/test_crypto.py b/OpenSSL/test/test_crypto.py
index 2f5ccad..5b8ab77 100644
--- a/OpenSSL/test/test_crypto.py
+++ b/OpenSSL/test/test_crypto.py
@@ -3222,7 +3222,7 @@
 
     def test_export_unknown_digest(self):
         """
-        Calling :py:obj:`OpenSSL.CRL.export` with a unsupported digest results
+        Calling :py:obj:`OpenSSL.CRL.export` with an unsupported digest results
         in a :py:obj:`ValueError` being raised.
         """
         crl = CRL()
diff --git a/OpenSSL/tsafe.py b/OpenSSL/tsafe.py
index 3a9c710..28df8cb 100644
--- a/OpenSSL/tsafe.py
+++ b/OpenSSL/tsafe.py
@@ -25,4 +25,3 @@
                 return self._ssl_conn.%s(*args)
             finally:
                 self._lock.release()\n""" % (f, f))
-
diff --git a/doc/conf.py b/doc/conf.py
index 5d34ae7..7d0fe9c 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -23,7 +23,7 @@
 
 def read_file(*parts):
     """
-    Build an absolute path from *parts* and and return the contents of the
+    Build an absolute path from *parts* and return the contents of the
     resulting file.  Assume UTF-8 encoding.
     """
     with codecs.open(os.path.join(HERE, *parts), "rb", "ascii") as f:
diff --git a/examples/proxy.py b/examples/proxy.py
index b094864..b1c4253 100644
--- a/examples/proxy.py
+++ b/examples/proxy.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# This script demostrates how one can use pyOpenSSL to speak SSL over an HTTP
+# This script demonstrates how one can use pyOpenSSL to speak SSL over an HTTP
 # proxy
 # The challenge here is to start talking SSL over an already connected socket
 #