BUG: Swap byteorder in constructor of Block Manager (pandas-dev#4737)

MHC03 · Aug 11, 2018 · ea0a392 · ea0a392
1 parent 0370740
commit ea0a392
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/pandas/core/internals/managers.py b/pandas/core/internals/managers.py
@@ -4,6 +4,7 @@
 import itertools
 import operator
 import re
+import sys
 
 import numpy as np
 
@@ -106,7 +107,12 @@ class BlockManager(PandasObject):
 
     def __init__(self, blocks, axes, do_integrity_check=True):
         self.axes = [ensure_index(ax) for ax in axes]
-        self.blocks = tuple(blocks)
+
+        non_native_byteorder = '>' if sys.byteorder == 'little' else '<'
+        self.blocks = tuple(block.astype(block.dtype.newbyteorder('='))
+                            if non_native_byteorder in str(block.dtype)
+                            else block
+                            for block in blocks)
 
         for block in blocks:
             if block.is_sparse: