可能我的例子是很多大,我的代码是在这里: import pandas as pd
import numpy as np
import io
t = """
name date
a 2005-08-31
a 2005-09-20
a 2005-11-12
a 2005-12-31
a 2006-03-31
a 2006-06-25
a 2006-07-23
a
#First, I divide the age group as follow ,
# 1. group A: 0-17years old;
# 2. group B: 18-35years old
# 3. group C: 36-50years old
# 4. group D: 51-65years old
# 5. group E: above 66 years old