diff -ru pandas-0.22.0.orig/pandas/io/common.py pandas-0.22.0/pandas/io/common.py
--- pandas-0.22.0.orig/pandas/io/common.py	2018-04-24 17:23:06.833240372 -0400
+++ pandas-0.22.0/pandas/io/common.py	2018-04-24 17:42:33.148934940 -0400
@@ -3,7 +3,10 @@
 import os
 import csv
 import codecs
-import mmap
+try:
+    from mmap import mmap
+except ImportError:
+    mmap = type(None)
 from contextlib import contextmanager, closing

 from pandas.compat import StringIO, BytesIO, string_types, text_type
@@ -203,7 +206,7 @@

     if isinstance(filepath_or_buffer, (compat.string_types,
                                        compat.binary_type,
-                                       mmap.mmap)):
+                                       mmap)):
         return _expand_user(filepath_or_buffer), None, compression

     if not is_file_like(filepath_or_buffer):
@@ -432,7 +435,7 @@
     """

     def __init__(self, f):
-        self.mmap = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
+        self.mmap = mmap(f.fileno(), 0, access=mmap.ACCESS_READ)

     def __getattr__(self, name):
         return getattr(self.mmap, name)