From 862017f8202285953ad7ca2d2e49038add1a850e Mon Sep 17 00:00:00 2001
From: Tom Augspurger <tom.w.augspurger@gmail.com>
Date: Fri, 30 Mar 2018 11:46:33 -0500
Subject: [PATCH 1/3] COMPAT: Remove use of private re attribute

Closes https://github.com/pandas-dev/pandas/issues/20551
---
 pandas/compat/__init__.py       | 6 ++++++
 pandas/core/dtypes/inference.py | 4 ++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/pandas/compat/__init__.py b/pandas/compat/__init__.py
index aefa1ddd6cf0b..6fc11d49e6b7d 100644
--- a/pandas/compat/__init__.py
+++ b/pandas/compat/__init__.py
@@ -423,6 +423,12 @@ def raise_with_traceback(exc, traceback=Ellipsis):
 parse_date = _date_parser.parse
 
 
+if PY36:
+    import typing
+    re_type = typing.re.Pattern
+else:
+    re_type = type(re.compile(''))
+
 # https://github.com/pandas-dev/pandas/pull/9123
 def is_platform_little_endian():
     """ am I little endian """
diff --git a/pandas/core/dtypes/inference.py b/pandas/core/dtypes/inference.py
index a02f0c5b2a4d6..d747e69d1ff39 100644
--- a/pandas/core/dtypes/inference.py
+++ b/pandas/core/dtypes/inference.py
@@ -6,7 +6,7 @@
 from collections import Iterable
 from numbers import Number
 from pandas.compat import (PY2, string_types, text_type,
-                           string_and_binary_types)
+                           string_and_binary_types, re_type)
 from pandas._libs import lib
 
 is_bool = lib.is_bool
@@ -216,7 +216,7 @@ def is_re(obj):
     False
     """
 
-    return isinstance(obj, re._pattern_type)
+    return isinstance(obj, re_type)
 
 
 def is_re_compilable(obj):

From 0dfce2258f1ce794ad828182ea11524a94990558 Mon Sep 17 00:00:00 2001
From: Tom Augspurger <tom.w.augspurger@gmail.com>
Date: Fri, 30 Mar 2018 13:20:23 -0500
Subject: [PATCH 2/3] Added a note

---
 pandas/compat/__init__.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pandas/compat/__init__.py b/pandas/compat/__init__.py
index 6fc11d49e6b7d..984adb167a9f5 100644
--- a/pandas/compat/__init__.py
+++ b/pandas/compat/__init__.py
@@ -26,6 +26,7 @@
 # pylint disable=W0611
 # flake8: noqa
 
+import re
 import functools
 import itertools
 from distutils.version import LooseVersion
@@ -136,7 +137,6 @@ def lfilter(*args, **kwargs):
 
 else:
     # Python 2
-    import re
     _name_re = re.compile(r"[a-zA-Z_][a-zA-Z0-9_]*$")
 
     FileNotFoundError = IOError
@@ -423,6 +423,7 @@ def raise_with_traceback(exc, traceback=Ellipsis):
 parse_date = _date_parser.parse
 
 
+# In Python 3.7, the private re._pattern_type is removed.
 if PY36:
     import typing
     re_type = typing.re.Pattern

From 7681282352aab31f57eb98a87694e279b2366831 Mon Sep 17 00:00:00 2001
From: Tom Augspurger <tom.w.augspurger@gmail.com>
Date: Fri, 30 Mar 2018 15:08:25 -0500
Subject: [PATCH 3/3] Use right lower bound

---
 pandas/compat/__init__.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pandas/compat/__init__.py b/pandas/compat/__init__.py
index 984adb167a9f5..8885064b22ea8 100644
--- a/pandas/compat/__init__.py
+++ b/pandas/compat/__init__.py
@@ -424,7 +424,8 @@ def raise_with_traceback(exc, traceback=Ellipsis):
 
 
 # In Python 3.7, the private re._pattern_type is removed.
-if PY36:
+# Python 3.5+ have typing.re.Pattern
+if PY35:
     import typing
     re_type = typing.re.Pattern
 else: