Remove Python 2.7 crutch for file.seekable()

segpy/portability.py

@@ -4,29 +4,6 @@ import sys
 EMPTY_BYTE_STRING = b'' if sys.version_info >= (3, 0) else ''
 
 
-def seekable(fh):
-    """Determine whether a file-like object supports seeking.
-
-    Args:
-        fh: The file-like-object to be tested.
-
-    Returns:
-        True if the file supports seeking, otherwise False.
-    """
-    try:
-        return fh.seekable()
-    except AttributeError:
-        try:
-            pos = fh.tell()
-            try:
-                fh.seek(0, os.SEEK_END)
-            finally:
-                fh.seek(pos)
-        except AttributeError:
-            return False
-    return True
-
-
 if sys.version_info >= (3, 0):
     long_int = int
 else:

segpy/reader.py

@@ -75,7 +75,7 @@ def create_reader(fh, encoding=None, trace_header_format=TraceHeaderRev1, endian
         raise TypeError(
             "SegYReader must be provided with a binary mode file object")
 
-    if not seekable(fh):
+    if not fh.seekable():
         raise TypeError(
             "SegYReader must be provided with a seekable file object")