Relocate four_bytes() from portability to util.

segpy/ibm_float.py

@@ -1,7 +1,7 @@
 from math import frexp, isnan, isinf, ceil, floor, trunc
 from numbers import Real
 
-from segpy.portability import four_bytes
+from segpy.util import four_bytes
 
 
 

segpy/portability.py

@@ -4,18 +4,6 @@ import sys
 EMPTY_BYTE_STRING = b'' if sys.version_info >= (3, 0) else ''
 
 
-if sys.version_info >= (3, 0):
-    def four_bytes(byte_str):
-        a, b, c, d = byte_str[:4]
-        return a, b, c, d
-else:
-    def four_bytes(byte_str):
-        a = ord(byte_str[0])
-        b = ord(byte_str[1])
-        c = ord(byte_str[2])
-        d = ord(byte_str[3])
-        return a, b, c, d
-
 if sys.version_info >= (3, 0):
     unicode = str
 else:

segpy/util.py

@@ -319,3 +319,8 @@ def super_class(cls):
 
 def flatten(sequence_of_sequences):
     return chain.from_iterable(sequence_of_sequences)
+
+
+def four_bytes(byte_str):
+    a, b, c, d = byte_str[:4]
+    return a, b, c, d