You can use crosstab
and then reindex
by union
of column and index values:
df = pd.crosstab(df.Name_A, df.Name_B)
print (df)
Name_B Ben Chris David
Name_A
Adam 1 1 0
Ben 0 1 0
Chris 0 0 1
df = pd.crosstab(df.Name_A, df.Name_B)
idx = df.columns.union(df.index)
df = df.reindex(index = idx, columns=idx, fill_value=0)
print (df)
Adam Ben Chris David
Adam 0 1 1 0
Ben 0 0 1 0
Chris 0 0 0 1
David 0 0 0 0