From 154710b6401c5fc81c0941536ef588275e38b71d Mon Sep 17 00:00:00 2001
From: Ryan Lynch <ryan.s.lynch@gmail.com>
Date: Fri, 18 Jan 2019 16:47:50 -0500
Subject: [PATCH] python2 to 3 compatbility for integer division and testing
 for string types

---
 bin/pyplotres.py        | 16 ++++++++++++++--
 lib/python/residuals.py |  2 +-
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/bin/pyplotres.py b/bin/pyplotres.py
index db4b1db2f..fb9429098 100755
--- a/bin/pyplotres.py
+++ b/bin/pyplotres.py
@@ -202,7 +202,13 @@ def get_xdata(self, key):
         """Return label describing xaxis and the corresponding
             data given keyword 'key'.
         """
-        if not (isinstance(key, bytes) or isinstance(key, str)):
+        # Python2/3 compatible way of checking for string types
+        # Taken from https://stackoverflow.com/questions/11301138/how-to-check-if-variable-is-string-with-python-2-and-3-compatibility
+        try:
+            basestring
+        except NameError:
+            basestring = str
+        if not isinstance(key, basestring):
             raise ValueError("key must be of type string.")
         xopt = key.lower()
         if xopt == 'numtoa':
@@ -228,7 +234,13 @@ def get_ydata(self, key, postfit=True):
             'postfit' is a boolean argument that determines if
             postfit, or prefit data is to be returned.
         """
-        if not (isinstance(key, bytes) or isinstance(key, str)):
+        # Python2/3 compatible way of checking for string types
+        # Taken from https://stackoverflow.com/questions/11301138/how-to-check-if-variable-is-string-with-python-2-and-3-compatibility
+        try:
+            basestring
+        except NameError:
+            basestring = str
+        if not isinstance(key, basestring):
             raise ValueError("key must be of type string.")
         yopt = key.lower()
         if postfit:
diff --git a/lib/python/residuals.py b/lib/python/residuals.py
index 01e9c4560..69ae4c720 100644
--- a/lib/python/residuals.py
+++ b/lib/python/residuals.py
@@ -61,7 +61,7 @@ def read_residuals(filename="resid2.tmp"):
         not (reclen==struct.calcsize(rectype))):
         print("Warning:  possibly reading residuals incorrectly... don't understand record size")
     infile.seek(0, 0) # position at file start
-    r.numTOAs = int(filelen / reclen)
+    r.numTOAs = filelen // reclen
     r.bary_TOA = Num.zeros(r.numTOAs, 'd')
     r.postfit_phs = Num.zeros(r.numTOAs, 'd')
     r.postfit_sec = Num.zeros(r.numTOAs, 'd')