diff --git a/Lib/ctypes/_aix.py b/Lib/ctypes/_aix.py
index 61af942..463f60a 100644
--- a/Lib/ctypes/_aix.py
+++ b/Lib/ctypes/_aix.py
@@ -32,7 +32,7 @@
 In documentation the archive is also referred to as the "base" and the shared
 library object is referred to as the "member".
 
-For dlopen() on AIX (read initAndLoad()) the calls are similiar.
+For dlopen() on AIX (read initAndLoad()) the calls are similar.
 Default activity occurs when no path information is provided. When path
 information is provided dlopen() does not search any other directories.
 
@@ -90,7 +90,7 @@
         if re.match("[0-9]", line):
             info.append(line)
         else:
-            # blank line (seperator), consume line and end for loop
+            # blank line (separator), consume line and end for loop
             break
     return info
 
diff --git a/Lib/email/_header_value_parser.py b/Lib/email/_header_value_parser.py
index d2d1f5c..d8becee 100644
--- a/Lib/email/_header_value_parser.py
+++ b/Lib/email/_header_value_parser.py
@@ -2745,8 +2745,8 @@
 
     Using the decoded list of parameters and values, format them according to
     the RFC rules, including using RFC2231 encoding if the value cannot be
-    expressed in 'encoding' and/or the paramter+value is too long to fit within
-    'maxlen'.
+    expressed in 'encoding' and/or the parameter+value is too long to fit
+    within 'maxlen'.
 
     """
     # Special case for RFC2231 encoding: start from decoded values and use
diff --git a/Lib/idlelib/configdialog.py b/Lib/idlelib/configdialog.py
index 4e8394b..231e14e 100644
--- a/Lib/idlelib/configdialog.py
+++ b/Lib/idlelib/configdialog.py
@@ -495,7 +495,7 @@
         Changing any of the font vars invokes var_changed_font, which
         adds all 3 font options to changes and calls set_samples.
         Set_samples applies a new font constructed from the font vars to
-        font_sample and to highlight_sample on the hightlight page.
+        font_sample and to highlight_sample on the highlight page.
 
         Tabs: Enable users to change spaces entered for indent tabs.
         Changing indent_scale value with the mouse sets Var space_num,
@@ -646,7 +646,7 @@
 
         Called on font initialization and change events.
         Accesses font_name, font_size, and font_bold Variables.
-        Updates font_sample and hightlight page highlight_sample.
+        Updates font_sample and highlight page highlight_sample.
         """
         font_name = self.font_name.get()
         font_weight = tkFont.BOLD if self.font_bold.get() else tkFont.NORMAL
diff --git a/Lib/opcode.py b/Lib/opcode.py
index 8f45f0a..368472d 100644
--- a/Lib/opcode.py
+++ b/Lib/opcode.py
@@ -142,7 +142,7 @@
 def_op('BUILD_TUPLE', 102)      # Number of tuple items
 def_op('BUILD_LIST', 103)       # Number of list items
 def_op('BUILD_SET', 104)        # Number of set items
-def_op('BUILD_MAP', 105)        # Number of dict entries (upto 255)
+def_op('BUILD_MAP', 105)        # Number of dict entries
 name_op('LOAD_ATTR', 106)       # Index in name list
 def_op('COMPARE_OP', 107)       # Comparison operator
 hascompare.append(107)
diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index a0883b9..8f9ebdd 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -1861,7 +1861,7 @@
 
         # Make sure comparison doesn't forget microseconds, and isn't done
         # via comparing a float timestamp (an IEEE double doesn't have enough
-        # precision to span microsecond resolution across years 1 thru 9999,
+        # precision to span microsecond resolution across years 1 through 9999,
         # so comparing via timestamp necessarily calls some distinct values
         # equal).
         dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
diff --git a/Lib/test/test_cmd.py b/Lib/test/test_cmd.py
index 99a483b..96e0c30 100644
--- a/Lib/test/test_cmd.py
+++ b/Lib/test/test_cmd.py
@@ -51,7 +51,7 @@
 
     Test for the function completedefault():
     >>> mycmd.completedefault()
-    This is the completedefault methode
+    This is the completedefault method
     >>> mycmd.completenames("a")
     ['add']
 
@@ -140,7 +140,7 @@
         print("Hello from postloop")
 
     def completedefault(self, *ignored):
-        print("This is the completedefault methode")
+        print("This is the completedefault method")
 
     def complete_command(self):
         print("complete command")
diff --git a/Lib/test/test_concurrent_futures.py b/Lib/test/test_concurrent_futures.py
index 675cd7a..18d0265 100644
--- a/Lib/test/test_concurrent_futures.py
+++ b/Lib/test/test_concurrent_futures.py
@@ -398,7 +398,7 @@
         queue_management_thread = executor._queue_management_thread
         del executor
 
-        # Make sure that all the executor ressources were properly cleaned by
+        # Make sure that all the executor resources were properly cleaned by
         # the shutdown process
         queue_management_thread.join()
         for p in processes.values():
@@ -886,24 +886,24 @@
         # extensive testing for deadlock caused by crashes in a pool.
         self.executor.shutdown(wait=True)
         crash_cases = [
-            # Check problem occuring while pickling a task in
+            # Check problem occurring while pickling a task in
             # the task_handler thread
             (id, (ErrorAtPickle(),), PicklingError, "error at task pickle"),
-            # Check problem occuring while unpickling a task on workers
+            # Check problem occurring while unpickling a task on workers
             (id, (ExitAtUnpickle(),), BrokenProcessPool,
              "exit at task unpickle"),
             (id, (ErrorAtUnpickle(),), BrokenProcessPool,
              "error at task unpickle"),
             (id, (CrashAtUnpickle(),), BrokenProcessPool,
              "crash at task unpickle"),
-            # Check problem occuring during func execution on workers
+            # Check problem occurring during func execution on workers
             (_crash, (), BrokenProcessPool,
              "crash during func execution on worker"),
             (_exit, (), SystemExit,
              "exit during func execution on worker"),
             (_raise_error, (RuntimeError, ), RuntimeError,
              "error during func execution on worker"),
-            # Check problem occuring while pickling a task result
+            # Check problem occurring while pickling a task result
             # on workers
             (_return_instance, (CrashAtPickle,), BrokenProcessPool,
              "crash during result pickle on worker"),
@@ -911,7 +911,7 @@
              "exit during result pickle on worker"),
             (_return_instance, (ErrorAtPickle,), PicklingError,
              "error during result pickle on worker"),
-            # Check problem occuring while unpickling a task in
+            # Check problem occurring while unpickling a task in
             # the result_handler thread
             (_return_instance, (ErrorAtUnpickle,), BrokenProcessPool,
              "error during result unpickle in result_handler"),
diff --git a/Lib/test/test_generators.py b/Lib/test/test_generators.py
index 3461f20..7360b34 100644
--- a/Lib/test/test_generators.py
+++ b/Lib/test/test_generators.py
@@ -1500,7 +1500,7 @@
                 succs[final].remove(corner)
                 add_to_successors(this)
 
-        # Generate moves 3 thru m*n-1.
+        # Generate moves 3 through m*n-1.
         def advance(len=len):
             # If some successor has only one exit, must take it.
             # Else favor successors with fewer exits.
@@ -1522,7 +1522,7 @@
                         yield i
                     add_to_successors(i)
 
-        # Generate moves 3 thru m*n-1.  Alternative version using a
+        # Generate moves 3 through m*n-1.  Alternative version using a
         # stronger (but more expensive) heuristic to order successors.
         # Since the # of backtracking levels is m*n, a poor move early on
         # can take eons to undo.  Smallest square board for which this
diff --git a/Lib/test/test_weakref.py b/Lib/test/test_weakref.py
index 0384a9f..9fa0bbd 100644
--- a/Lib/test/test_weakref.py
+++ b/Lib/test/test_weakref.py
@@ -1637,7 +1637,7 @@
         # has to keep looping to find the first object we delete.
         objs.reverse()
 
-        # Turn on mutation in C.__eq__.  The first time thru the loop,
+        # Turn on mutation in C.__eq__.  The first time through the loop,
         # under the iterkeys() business the first comparison will delete
         # the last item iterkeys() would see, and that causes a
         #     RuntimeError: dictionary changed size during iteration
diff --git a/Lib/unittest/test/test_discovery.py b/Lib/unittest/test/test_discovery.py
index 48d8fe9..227b44a 100644
--- a/Lib/unittest/test/test_discovery.py
+++ b/Lib/unittest/test/test_discovery.py
@@ -199,8 +199,8 @@
                          ['a_directory', 'test_directory', 'test_directory2'])
 
         # load_tests should have been called once with loader, tests and pattern
-        # (but there are no tests in our stub module itself, so thats [] at the
-        # time of call.
+        # (but there are no tests in our stub module itself, so that is [] at
+        # the time of call).
         self.assertEqual(Module.load_tests_args,
                          [(loader, [], 'test*')])