code sample for pandas-dev#47039

Author: simonjayhawkins

bisect/47039.py

@@ -0,0 +1,19 @@
+# BUG: DataFrame.shift shows different behavior for axis=1 when freq is specified #47039
+
+import numpy as np
+import pandas as pd
+
+print(pd.__version__)
+
+rs = np.random.RandomState(0)
+
+raw = pd.DataFrame(
+    rs.randint(1000, size=(10, 8)), columns=["col" + str(i + 1) for i in range(8)]
+)
+raw.index = pd.date_range("2020-1-1", periods=10)
+raw.columns = pd.date_range("2020-3-1", periods=8)
+result = raw.shift(periods=2, freq="D", axis=1)
+print(result)
+
+expected = raw.shift(periods=2, freq="D", axis=1, fill_value=0)
+pd.testing.assert_frame_equal(result, expected)