fix encoding bug in zipopen

Author: ptooley

pypop/trace/prvtrace.py

@@ -56,8 +56,8 @@
 class PRVTrace(Trace):
     def _gather_metadata(self):
 
-        with zipopen(self._tracefile, "r") as fh:
-            headerline = fh.readline().decode().strip()
+        with zipopen(self._tracefile, "rt") as fh:
+            headerline = fh.readline().strip()
 
         elem = headerline.replace(":", ";", 1).split(":", 4)
 

pypop/utils/io.py

@@ -14,6 +14,12 @@
 
 
 def zipopen(path, mode="rt"):
+
+    # Default modes of open() and gzip.open() are not the same ('t' and 'b' respectively)
+    # so ensure a consistent default of text mode
+    if not any(x in mode for x in ('t', 'b')):
+        mode = "{}t".format(mode)
+
     try:
         if gzip.open(path, mode=mode).readline():
             return gzip.open(path, mode=mode)