引用分组列作为pyplot中的x轴

时间:2018-08-27 07:49:00

标签: pandas dataframe matplotlib plot pandas-groupby

我有一个具有以下结构的数据框:

custid  province    year    features... label
123     AB          2005    ...         0
124     ON          2006    ...         1
...
999     QC          2012    ...         1

最后一列是标签/目标。

我有一个lambda函数:

def churn_per_feature(x):
    d = {}
    d['churn_count'] = (x['label'] == 1).sum()
    d['cust_count'] = x['custid'].nunique()
    d['churn_rate'] = d['churn_count'] / float(d['cust_count'])
    return pd.Series(d, index = ['churn_count', 'cust_count', 'churn_rate'])

我对两个变量provinceyear进行了分组:

churn_per_province_year = df.groupby(['province', 'year']).apply(churn_per_feature)

我正在尝试pyplot,一个带有线的单个图表,其中x轴是years,每条线代表province(到目前为止,我仅选择4客户人数最多的省份,因此不会出现循环):

plt.plot(years, churn_per_province_year[churn_per_province_year['province'] == 'ON']['cust_count'])
plt.plot(years, churn_per_province_year[churn_per_province_year['province'] == 'AB']['cust_count'])
plt.plot(years, churn_per_province_year[churn_per_province_year['province'] == 'BC']['cust_count'])
plt.plot(years, churn_per_province_year[churn_per_province_year['province'] == 'QC']['cust_count'])
plt.show()

我不知道如何引用years部分。

1 个答案:

答案 0 :(得分:1)

您想要以下内容吗?

df.groupby(['year', 'province']).apply(churn_per_feature)['cust_count'].unstack().plot(legend=True)

enter image description here

使用matplotlib plt.plot()

churn_per_province_year = df.groupby(['year', 'province']).apply(churn_per_feature).reset_index()
#from matplotlib import pyplot
#years = range(2005, 2019) # add the right range here
plt.plot(years, churn_per_province_year[churn_per_province_year['province'] == 'ON']['cust_count'], label='ON')
plt.plot(years, churn_per_province_year[churn_per_province_year['province'] == 'AB']['cust_count'], label='AB')
plt.plot(years, churn_per_province_year[churn_per_province_year['province'] == 'QC']['cust_count'], label='QC')
plt.legend()
plt.show()

enter image description here