import pandas as pd
df = pd.DataFrame({'A': [1, 2, 3], 'B': [1.0, 2.0, 3.0],
                           'C': ['1.1.2010', '2.1.2011', '3.1.2011'],
                           'D': ['1 days', '>=500', '3 days'],
                           'E': ['1', '2', '3']})

df2 = df[df["D"] == "1 days"]

df1 = df[df["D"] == '>=500']