200 B
200 B
Basics
df.loc[:, "D"] = np.array([5] * len(df))
df.loc[:, ["A", "B"]]
df.sort_index(axis=1, ascending=False) #axis=1 sort columns by labels, axis=0 sort by index
df.loc[:, "D"] = np.array([5] * len(df))
df.loc[:, ["A", "B"]]
df.sort_index(axis=1, ascending=False) #axis=1 sort columns by labels, axis=0 sort by index