diff --git a/Lib/idlelib/editor.py b/Lib/idlelib/editor.py
index b51c45c97e5..ab9c7e615ef 100644
--- a/Lib/idlelib/editor.py
+++ b/Lib/idlelib/editor.py
@@ -1302,7 +1302,7 @@ class EditorWindow(object):
                     startat = max(lno - context, 1)
                     startatindex = repr(startat) + ".0"
                     rawtext = text.get(startatindex, "insert")
-                    y.set_str(rawtext)
+                    y.set_code(rawtext)
                     bod = y.find_good_parse_start(
                               self.context_use_ps1,
                               self._build_char_in_string_func(startatindex))
@@ -1316,7 +1316,7 @@ class EditorWindow(object):
                 else:
                     startatindex = "1.0"
                 rawtext = text.get(startatindex, "insert")
-                y.set_str(rawtext)
+                y.set_code(rawtext)
                 y.set_lo(0)
 
             c = y.get_continuation_type()
diff --git a/Lib/idlelib/hyperparser.py b/Lib/idlelib/hyperparser.py
index 450a709c09b..a42665bb632 100644
--- a/Lib/idlelib/hyperparser.py
+++ b/Lib/idlelib/hyperparser.py
@@ -44,7 +44,7 @@ class HyperParser:
                 # at end. We add a space so that index won't be at end
                 # of line, so that its status will be the same as the
                 # char before it, if should.
-                parser.set_str(text.get(startatindex, stopatindex)+' \n')
+                parser.set_code(text.get(startatindex, stopatindex)+' \n')
                 bod = parser.find_good_parse_start(
                           editwin._build_char_in_string_func(startatindex))
                 if bod is not None or startat == 1:
@@ -60,12 +60,12 @@ class HyperParser:
             # We add the newline because PyParse requires it. We add a
             # space so that index won't be at end of line, so that its
             # status will be the same as the char before it, if should.
-            parser.set_str(text.get(startatindex, stopatindex)+' \n')
+            parser.set_code(text.get(startatindex, stopatindex)+' \n')
             parser.set_lo(0)
 
         # We want what the parser has, minus the last newline and space.
-        self.rawtext = parser.str[:-2]
-        # Parser.str apparently preserves the statement we are in, so
+        self.rawtext = parser.code[:-2]
+        # Parser.code apparently preserves the statement we are in, so
         # that stopatindex can be used to synchronize the string with
         # the text box indices.
         self.stopatindex = stopatindex
diff --git a/Lib/idlelib/idle_test/test_pyparse.py b/Lib/idlelib/idle_test/test_pyparse.py
index c45815b36ff..c7b645caa6a 100644
--- a/Lib/idlelib/idle_test/test_pyparse.py
+++ b/Lib/idlelib/idle_test/test_pyparse.py
@@ -62,32 +62,32 @@ class PyParseTest(unittest.TestCase):
         self.assertEqual(self.parser.indentwidth, 4)
         self.assertEqual(self.parser.tabwidth, 4)
 
-    def test_set_str(self):
+    def test_set_code(self):
         eq = self.assertEqual
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
 
         # Not empty and doesn't end with newline.
         with self.assertRaises(AssertionError):
-            setstr('a')
+            setcode('a')
 
         tests = ('',
                  'a\n')
 
         for string in tests:
             with self.subTest(string=string):
-                setstr(string)
-                eq(p.str, string)
+                setcode(string)
+                eq(p.code, string)
                 eq(p.study_level, 0)
 
     def test_find_good_parse_start(self):
         eq = self.assertEqual
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
         start = p.find_good_parse_start
 
         # Split def across lines.
-        setstr('"""This is a module docstring"""\n'
+        setcode('"""This is a module docstring"""\n'
                'class C():\n'
                '    def __init__(self, a,\n'
                '                 b=True):\n'
@@ -117,7 +117,7 @@ class PyParseTest(unittest.TestCase):
 
         # Code without extra line break in def line - mostly returns the same
         # values.
-        setstr('"""This is a module docstring"""\n'
+        setcode('"""This is a module docstring"""\n'
                'class C():\n'
                '    def __init__(self, a, b=True):\n'
                '        pass\n'
@@ -138,19 +138,19 @@ class PyParseTest(unittest.TestCase):
                 '        pass\n'
                 )
         p = self.parser
-        p.set_str(code)
+        p.set_code(code)
 
         # Previous character is not a newline.
         with self.assertRaises(AssertionError):
             p.set_lo(5)
 
-        # A value of 0 doesn't change self.str.
+        # A value of 0 doesn't change self.code.
         p.set_lo(0)
-        self.assertEqual(p.str, code)
+        self.assertEqual(p.code, code)
 
         # An index that is preceded by a newline.
         p.set_lo(44)
-        self.assertEqual(p.str, code[44:])
+        self.assertEqual(p.code, code[44:])
 
     def test_tran(self):
         self.assertEqual('\t a([{b}])b"c\'d\n'.translate(self.parser._tran),
@@ -159,7 +159,7 @@ class PyParseTest(unittest.TestCase):
     def test_study1(self):
         eq = self.assertEqual
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
         study = p._study1
 
         (NONE, BACKSLASH, FIRST, NEXT, BRACKET) = range(5)
@@ -197,7 +197,7 @@ class PyParseTest(unittest.TestCase):
 
         for test in tests:
             with self.subTest(string=test.string):
-                setstr(test.string)  # resets study_level
+                setcode(test.string)  # resets study_level
                 study()
                 eq(p.study_level, 1)
                 eq(p.goodlines, test.goodlines)
@@ -209,7 +209,7 @@ class PyParseTest(unittest.TestCase):
     def test_get_continuation_type(self):
         eq = self.assertEqual
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
         gettype = p.get_continuation_type
 
         (NONE, BACKSLASH, FIRST, NEXT, BRACKET) = range(5)
@@ -224,13 +224,13 @@ class PyParseTest(unittest.TestCase):
 
         for test in tests:
             with self.subTest(string=test.string):
-                setstr(test.string)
+                setcode(test.string)
                 eq(gettype(), test.continuation)
 
     def test_study2(self):
         eq = self.assertEqual
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
         study = p._study2
 
         TestInfo = namedtuple('TestInfo', ['string', 'start', 'end', 'lastch',
@@ -276,7 +276,7 @@ class PyParseTest(unittest.TestCase):
 
         for test in tests:
             with self.subTest(string=test.string):
-                setstr(test.string)
+                setcode(test.string)
                 study()
                 eq(p.study_level, 2)
                 eq(p.stmt_start, test.start)
@@ -291,7 +291,7 @@ class PyParseTest(unittest.TestCase):
     def test_get_num_lines_in_stmt(self):
         eq = self.assertEqual
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
         getlines = p.get_num_lines_in_stmt
 
         TestInfo = namedtuple('TestInfo', ['string', 'lines'])
@@ -307,19 +307,19 @@ class PyParseTest(unittest.TestCase):
             )
 
         # Blank string doesn't have enough elements in goodlines.
-        setstr('')
+        setcode('')
         with self.assertRaises(IndexError):
             getlines()
 
         for test in tests:
             with self.subTest(string=test.string):
-                setstr(test.string)
+                setcode(test.string)
                 eq(getlines(), test.lines)
 
     def test_compute_bracket_indent(self):
         eq = self.assertEqual
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
         indent = p.compute_bracket_indent
 
         TestInfo = namedtuple('TestInfo', ['string', 'spaces'])
@@ -340,18 +340,18 @@ class PyParseTest(unittest.TestCase):
              )
 
         # Must be C_BRACKET continuation type.
-        setstr('def function1(self, a, b):\n')
+        setcode('def function1(self, a, b):\n')
         with self.assertRaises(AssertionError):
             indent()
 
         for test in tests:
-            setstr(test.string)
+            setcode(test.string)
             eq(indent(), test.spaces)
 
     def test_compute_backslash_indent(self):
         eq = self.assertEqual
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
         indent = p.compute_backslash_indent
 
         # Must be C_BACKSLASH continuation type.
@@ -361,7 +361,7 @@ class PyParseTest(unittest.TestCase):
                   )
         for string in errors:
             with self.subTest(string=string):
-                setstr(string)
+                setcode(string)
                 with self.assertRaises(AssertionError):
                     indent()
 
@@ -384,13 +384,13 @@ class PyParseTest(unittest.TestCase):
                  )
         for test in tests:
             with self.subTest(string=test.string):
-                setstr(test.string)
+                setcode(test.string)
                 eq(indent(), test.spaces)
 
     def test_get_base_indent_string(self):
         eq = self.assertEqual
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
         baseindent = p.get_base_indent_string
 
         TestInfo = namedtuple('TestInfo', ['string', 'indent'])
@@ -405,14 +405,14 @@ class PyParseTest(unittest.TestCase):
 
         for test in tests:
             with self.subTest(string=test.string):
-                setstr(test.string)
+                setcode(test.string)
                 eq(baseindent(), test.indent)
 
     def test_is_block_opener(self):
         yes = self.assertTrue
         no = self.assertFalse
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
         opener = p.is_block_opener
 
         TestInfo = namedtuple('TestInfo', ['string', 'assert_'])
@@ -433,14 +433,14 @@ class PyParseTest(unittest.TestCase):
 
         for test in tests:
             with self.subTest(string=test.string):
-                setstr(test.string)
+                setcode(test.string)
                 test.assert_(opener())
 
     def test_is_block_closer(self):
         yes = self.assertTrue
         no = self.assertFalse
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
         closer = p.is_block_closer
 
         TestInfo = namedtuple('TestInfo', ['string', 'assert_'])
@@ -462,13 +462,13 @@ class PyParseTest(unittest.TestCase):
 
         for test in tests:
             with self.subTest(string=test.string):
-                setstr(test.string)
+                setcode(test.string)
                 test.assert_(closer())
 
     def test_get_last_stmt_bracketing(self):
         eq = self.assertEqual
         p = self.parser
-        setstr = p.set_str
+        setcode = p.set_code
         bracketing = p.get_last_stmt_bracketing
 
         TestInfo = namedtuple('TestInfo', ['string', 'bracket'])
@@ -489,7 +489,7 @@ class PyParseTest(unittest.TestCase):
 
         for test in tests:
             with self.subTest(string=test.string):
-                setstr(test.string)
+                setcode(test.string)
                 eq(bracketing(), test.bracket)
 
 
diff --git a/Lib/idlelib/pyparse.py b/Lib/idlelib/pyparse.py
index 93607dc5bcd..443d198d1ef 100644
--- a/Lib/idlelib/pyparse.py
+++ b/Lib/idlelib/pyparse.py
@@ -149,9 +149,9 @@ class Parser:
         self.indentwidth = indentwidth
         self.tabwidth = tabwidth
 
-    def set_str(self, s):
+    def set_code(self, s):
         assert len(s) == 0 or s[-1] == '\n'
-        self.str = s
+        self.code = s
         self.study_level = 0
 
     def find_good_parse_start(self, is_char_in_string=None,
@@ -168,7 +168,7 @@ class Parser:
         function, meaning that when it says "no", it's absolutely
         guaranteed that the char is not in a string.
         """
-        str, pos = self.str, None
+        code, pos = self.code, None
 
         if not is_char_in_string:
             # no clue -- make the caller pass everything
@@ -177,13 +177,13 @@ class Parser:
         # Peek back from the end for a good place to start,
         # but don't try too often; pos will be left None, or
         # bumped to a legitimate synch point.
-        limit = len(str)
+        limit = len(code)
         for tries in range(5):
-            i = str.rfind(":\n", 0, limit)
+            i = code.rfind(":\n", 0, limit)
             if i < 0:
                 break
-            i = str.rfind('\n', 0, i) + 1  # start of colon line (-1+1=0)
-            m = _synchre(str, i, limit)
+            i = code.rfind('\n', 0, i) + 1  # start of colon line (-1+1=0)
+            m = _synchre(code, i, limit)
             if m and not is_char_in_string(m.start()):
                 pos = m.start()
                 break
@@ -197,7 +197,7 @@ class Parser:
             # going to have to parse the whole thing to be sure, so
             # give it one last try from the start, but stop wasting
             # time here regardless of the outcome.
-            m = _synchre(str)
+            m = _synchre(code)
             if m and not is_char_in_string(m.start()):
                 pos = m.start()
             return pos
@@ -206,7 +206,7 @@ class Parser:
         # matches.
         i = pos + 1
         while 1:
-            m = _synchre(str, i)
+            m = _synchre(code, i)
             if m:
                 s, i = m.span()
                 if not is_char_in_string(s):
@@ -220,9 +220,9 @@ class Parser:
 
         Intended to be called with the result of find_good_parse_start().
         """
-        assert lo == 0 or self.str[lo-1] == '\n'
+        assert lo == 0 or self.code[lo-1] == '\n'
         if lo > 0:
-            self.str = self.str[lo:]
+            self.code = self.code[lo:]
 
     # Build a translation table to map uninteresting chars to 'x', open
     # brackets to '(', close brackets to ')' while preserving quotes,
@@ -249,13 +249,13 @@ class Parser:
         # to "(", all close brackets to ")", then collapse runs of
         # uninteresting characters.  This can cut the number of chars
         # by a factor of 10-40, and so greatly speed the following loop.
-        str = self.str
-        str = str.translate(self._tran)
-        str = str.replace('xxxxxxxx', 'x')
-        str = str.replace('xxxx', 'x')
-        str = str.replace('xx', 'x')
-        str = str.replace('xx', 'x')
-        str = str.replace('\nx', '\n')
+        code = self.code
+        code = code.translate(self._tran)
+        code = code.replace('xxxxxxxx', 'x')
+        code = code.replace('xxxx', 'x')
+        code = code.replace('xx', 'x')
+        code = code.replace('xx', 'x')
+        code = code.replace('\nx', '\n')
         # Replacing x\n with \n would be incorrect because
         # x may be preceded by a backslash.
 
@@ -266,9 +266,9 @@ class Parser:
         level = lno = 0     # level is nesting level; lno is line number
         self.goodlines = goodlines = [0]
         push_good = goodlines.append
-        i, n = 0, len(str)
+        i, n = 0, len(code)
         while i < n:
-            ch = str[i]
+            ch = code[i]
             i = i+1
 
             # cases are checked in decreasing order of frequency
@@ -295,19 +295,19 @@ class Parser:
             if ch == '"' or ch == "'":
                 # consume the string
                 quote = ch
-                if str[i-1:i+2] == quote * 3:
+                if code[i-1:i+2] == quote * 3:
                     quote = quote * 3
                 firstlno = lno
                 w = len(quote) - 1
                 i = i+w
                 while i < n:
-                    ch = str[i]
+                    ch = code[i]
                     i = i+1
 
                     if ch == 'x':
                         continue
 
-                    if str[i-1:i+w] == quote:
+                    if code[i-1:i+w] == quote:
                         i = i+w
                         break
 
@@ -322,7 +322,7 @@ class Parser:
 
                     if ch == '\\':
                         assert i < n
-                        if str[i] == '\n':
+                        if code[i] == '\n':
                             lno = lno + 1
                         i = i+1
                         continue
@@ -333,7 +333,7 @@ class Parser:
                     # didn't break out of the loop, so we're still
                     # inside a string
                     if (lno - 1) == firstlno:
-                        # before the previous \n in str, we were in the first
+                        # before the previous \n in code, we were in the first
                         # line of the string
                         continuation = C_STRING_FIRST_LINE
                     else:
@@ -342,13 +342,13 @@ class Parser:
 
             if ch == '#':
                 # consume the comment
-                i = str.find('\n', i)
+                i = code.find('\n', i)
                 assert i >= 0
                 continue
 
             assert ch == '\\'
             assert i < n
-            if str[i] == '\n':
+            if code[i] == '\n':
                 lno = lno + 1
                 if i+1 == n:
                     continuation = C_BACKSLASH
@@ -397,9 +397,9 @@ class Parser:
         self.study_level = 2
 
         # Set p and q to slice indices of last interesting stmt.
-        str, goodlines = self.str, self.goodlines
+        code, goodlines = self.code, self.goodlines
         i = len(goodlines) - 1  # Index of newest line.
-        p = len(str)  # End of goodlines[i]
+        p = len(code)  # End of goodlines[i]
         while i:
             assert p
             # Make p be the index of the stmt at line number goodlines[i].
@@ -407,10 +407,10 @@ class Parser:
             q = p
             for nothing in range(goodlines[i-1], goodlines[i]):
                 # tricky: sets p to 0 if no preceding newline
-                p = str.rfind('\n', 0, p-1) + 1
-            # The stmt str[p:q] isn't a continuation, but may be blank
+                p = code.rfind('\n', 0, p-1) + 1
+            # The stmt code[p:q] isn't a continuation, but may be blank
             # or a non-indenting comment line.
-            if  _junkre(str, p):
+            if  _junkre(code, p):
                 i = i-1
             else:
                 break
@@ -428,21 +428,21 @@ class Parser:
         bracketing = [(p, 0)]
         while p < q:
             # suck up all except ()[]{}'"#\\
-            m = _chew_ordinaryre(str, p, q)
+            m = _chew_ordinaryre(code, p, q)
             if m:
                 # we skipped at least one boring char
                 newp = m.end()
                 # back up over totally boring whitespace
                 i = newp - 1    # index of last boring char
-                while i >= p and str[i] in " \t\n":
+                while i >= p and code[i] in " \t\n":
                     i = i-1
                 if i >= p:
-                    lastch = str[i]
+                    lastch = code[i]
                 p = newp
                 if p >= q:
                     break
 
-            ch = str[p]
+            ch = code[p]
 
             if ch in "([{":
                 push_stack(p)
@@ -469,14 +469,14 @@ class Parser:
                 # have to.
                 bracketing.append((p, len(stack)+1))
                 lastch = ch
-                p = _match_stringre(str, p, q).end()
+                p = _match_stringre(code, p, q).end()
                 bracketing.append((p, len(stack)))
                 continue
 
             if ch == '#':
                 # consume comment and trailing newline
                 bracketing.append((p, len(stack)+1))
-                p = str.find('\n', p, q) + 1
+                p = code.find('\n', p, q) + 1
                 assert p > 0
                 bracketing.append((p, len(stack)))
                 continue
@@ -484,9 +484,9 @@ class Parser:
             assert ch == '\\'
             p = p+1     # beyond backslash
             assert p < q
-            if str[p] != '\n':
+            if code[p] != '\n':
                 # the program is invalid, but can't complain
-                lastch = ch + str[p]
+                lastch = ch + code[p]
             p = p+1     # beyond escaped char
 
         # end while p < q:
@@ -503,28 +503,28 @@ class Parser:
         self._study2()
         assert self.continuation == C_BRACKET
         j = self.lastopenbracketpos
-        str = self.str
-        n = len(str)
-        origi = i = str.rfind('\n', 0, j) + 1
+        code = self.code
+        n = len(code)
+        origi = i = code.rfind('\n', 0, j) + 1
         j = j+1     # one beyond open bracket
         # find first list item; set i to start of its line
         while j < n:
-            m = _itemre(str, j)
+            m = _itemre(code, j)
             if m:
                 j = m.end() - 1     # index of first interesting char
                 extra = 0
                 break
             else:
                 # this line is junk; advance to next line
-                i = j = str.find('\n', j) + 1
+                i = j = code.find('\n', j) + 1
         else:
             # nothing interesting follows the bracket;
             # reproduce the bracket line's indentation + a level
             j = i = origi
-            while str[j] in " \t":
+            while code[j] in " \t":
                 j = j+1
             extra = self.indentwidth
-        return len(str[i:j].expandtabs(self.tabwidth)) + extra
+        return len(code[i:j].expandtabs(self.tabwidth)) + extra
 
     def get_num_lines_in_stmt(self):
         """Return number of physical lines in last stmt.
@@ -544,18 +544,18 @@ class Parser:
         """
         self._study2()
         assert self.continuation == C_BACKSLASH
-        str = self.str
+        code = self.code
         i = self.stmt_start
-        while str[i] in " \t":
+        while code[i] in " \t":
             i = i+1
         startpos = i
 
         # See whether the initial line starts an assignment stmt; i.e.,
         # look for an = operator
-        endpos = str.find('\n', startpos) + 1
+        endpos = code.find('\n', startpos) + 1
         found = level = 0
         while i < endpos:
-            ch = str[i]
+            ch = code[i]
             if ch in "([{":
                 level = level + 1
                 i = i+1
@@ -564,14 +564,14 @@ class Parser:
                     level = level - 1
                 i = i+1
             elif ch == '"' or ch == "'":
-                i = _match_stringre(str, i, endpos).end()
+                i = _match_stringre(code, i, endpos).end()
             elif ch == '#':
                 # This line is unreachable because the # makes a comment of
                 # everything after it.
                 break
             elif level == 0 and ch == '=' and \
-                   (i == 0 or str[i-1] not in "=<>!") and \
-                   str[i+1] != '=':
+                   (i == 0 or code[i-1] not in "=<>!") and \
+                   code[i+1] != '=':
                 found = 1
                 break
             else:
@@ -581,16 +581,16 @@ class Parser:
             # found a legit =, but it may be the last interesting
             # thing on the line
             i = i+1     # move beyond the =
-            found = re.match(r"\s*\\", str[i:endpos]) is None
+            found = re.match(r"\s*\\", code[i:endpos]) is None
 
         if not found:
             # oh well ... settle for moving beyond the first chunk
             # of non-whitespace chars
             i = startpos
-            while str[i] not in " \t\n":
+            while code[i] not in " \t\n":
                 i = i+1
 
-        return len(str[self.stmt_start:i].expandtabs(\
+        return len(code[self.stmt_start:i].expandtabs(\
                                      self.tabwidth)) + 1
 
     def get_base_indent_string(self):
@@ -600,10 +600,10 @@ class Parser:
         self._study2()
         i, n = self.stmt_start, self.stmt_end
         j = i
-        str = self.str
-        while j < n and str[j] in " \t":
+        code = self.code
+        while j < n and code[j] in " \t":
             j = j + 1
-        return str[i:j]
+        return code[i:j]
 
     def is_block_opener(self):
         "Return True if the last interesting statemtent opens a block."
@@ -613,7 +613,7 @@ class Parser:
     def is_block_closer(self):
         "Return True if the last interesting statement closes a block."
         self._study2()
-        return _closere(self.str, self.stmt_start) is not None
+        return _closere(self.code, self.stmt_start) is not None
 
     def get_last_stmt_bracketing(self):
         """Return bracketing structure of the last interesting statement.
diff --git a/Misc/NEWS.d/next/IDLE/2018-02-23-07-32-36.bpo-32916.4MsQ5F.rst b/Misc/NEWS.d/next/IDLE/2018-02-23-07-32-36.bpo-32916.4MsQ5F.rst
new file mode 100644
index 00000000000..0832944f162
--- /dev/null
+++ b/Misc/NEWS.d/next/IDLE/2018-02-23-07-32-36.bpo-32916.4MsQ5F.rst
@@ -0,0 +1 @@
+Change ``str`` to ``code`` in pyparse.