【发布时间】：2018-10-23 15:34:11
【问题描述】：
我正在尝试使用我输入为pandas.Dataframe 的这个 csv 文件，为各种购物者提供黑色星期五的购买数据以及各种变量，以了解他们的购买模式。
User_ID,Product_ID,Gender,Age,Occupation,City_Category,Stay_In_Current_City_Years,Marital_Status,Product_Category_1,Product_Category_2,Product_Category_3,Purchase
1000001,P00069042,F,0-17,10,A,2,0,3,,,8370
1000001,P00248942,F,0-17,10,A,2,0,1,6,14,15200
1000001,P00087842,F,0-17,10,A,2,0,12,,,1422
1000001,P00085442,F,0-17,10,A,2,0,12,14,,1057
1000002,P00285442,M,55+,16,C,4+,0,8,,,7969
1000003,P00193542,M,26-35,15,A,3,0,1,2,,15227
1000004,P00184942,M,46-50,7,B,2,1,1,8,17,19215
1000004,P00346142,M,46-50,7,B,2,1,1,15,,15854
1000004,P0097242,M,46-50,7,B,2,1,1,16,,15686
1000005,P00274942,M,26-35,20,A,1,1,8,,,7871
1000005,P00251242,M,26-35,20,A,1,1,5,11,,5254
1000005,P00014542,M,26-35,20,A,1,1,8,,,3957
1000005,P00031342,M,26-35,20,A,1,1,8,,,6073
1000005,P00145042,M,26-35,20,A,1,1,1,2,5,15665
1000006,P00231342,F,51-55,9,A,1,0,5,8,14,5378
1000006,P00190242,F,51-55,9,A,1,0,4,5,,2079
1000006,P0096642,F,51-55,9,A,1,0,2,3,4,13055
1000006,P00058442,F,51-55,9,A,1,0,5,14,,8851
1000007,P00036842,M,36-45,1,B,1,1,1,14,16,11788
1000008,P00249542,M,26-35,12,C,4+,1,1,5,15,19614
1000008,P00220442,M,26-35,12,C,4+,1,5,14,,8584
1000008,P00156442,M,26-35,12,C,4+,1,8,,,9872
1000008,P00213742,M,26-35,12,C,4+,1,8,,,9743
1000008,P00214442,M,26-35,12,C,4+,1,8,,,5982
1000008,P00303442,M,26-35,12,C,4+,1,1,8,14,11927
1000009,P00135742,M,26-35,17,C,0,0,6,8,,16662
1000009,P00039942,M,26-35,17,C,0,0,8,,,5887
1000009,P00161442,M,26-35,17,C,0,0,5,14,,6973
1000009,P00078742,M,26-35,17,C,0,0,5,8,14,5391
1000010,P00085942,F,36-45,1,B,4+,1,2,4,8,16352
1000010,P00118742,F,36-45,1,B,4+,1,5,11,,8886
1000010,P00297942,F,36-45,1,B,4+,1,8,,,5875
1000010,P00266842,F,36-45,1,B,4+,1,5,,,8854
1000010,P00058342,F,36-45,1,B,4+,1,3,4,,10946
1000010,P00032442,F,36-45,1,B,4+,1,5,,,5152
1000010,P00105942,F,36-45,1,B,4+,1,5,,,7089
1000010,P00182642,F,36-45,1,B,4+,1,2,4,9,12909
1000010,P00186942,F,36-45,1,B,4+,1,5,12,,8770
1000010,P00155442,F,36-45,1,B,4+,1,1,11,15,15212
1000010,P00221342,F,36-45,1,B,4+,1,1,2,5,15705
1000010,P00087242,F,36-45,1,B,4+,1,14,,,7947
1000010,P00111142,F,36-45,1,B,4+,1,1,15,16,18963
1000010,P00259342,F,36-45,1,B,4+,1,5,9,,8718
1000010,P0094542,F,36-45,1,B,4+,1,2,4,9,16406
1000010,P00148642,F,36-45,1,B,4+,1,6,10,13,12642
1000010,P00312142,F,36-45,1,B,4+,1,8,,,10007
1000010,P00113242,F,36-45,1,B,4+,1,1,6,8,11562
现在我想按城市和性别创建一个总购买量的堆积图，如下所示： 这是我尝试过的：
import pandas
import matplotlib.pyplot as plt
from matplotlib.ticker import StrMethodFormatter
import numpy as np
with open('BlackFriday.csv') as csv_file:
df = pandas.read_csv(csv_file, sep=',')
# Group by user id, city and gender
users_by_city_gender = df.groupby(['City_Category','Gender'])['Purchase'].agg('sum').to_frame()
ax3 = pandas.DataFrame({'City-A': users_by_city_gender.groupby('City_Category').get_group('A').Purchase,
'City-B': users_by_city_gender.groupby('City_Category').get_group('B').Purchase,
'City-C': users_by_city_gender.groupby('City_Category').get_group('C').Purchase}).plot.hist(stacked=True)
## Switch off ticks
ax3.tick_params(axis="both", which="both", bottom=False, top=False, labelbottom=False, left=False, right=False,
labelleft=True)
# Draw horizontal axis lines
# vals = ax.get_yticks()
# for tick in vals:
# ax.axhline(y=tick, linestyle='dashed', alpha=0.4, color='#eeeeee', zorder=1)
# Remove title
ax3.set_title("Total purchase by city and gender")
# Set x-axis label
ax3.set_xlabel("City category", labelpad=20, weight='bold', size=12)
# Set y-axis label
ax3.set_ylabel("Total purchase [dollars]", labelpad=20, weight='bold', size=12)
# Format y-axis label
ax3.yaxis.set_major_formatter(StrMethodFormatter('{x:,g}'))
plt.show()
生成的情节是，这似乎与我想要的情节完全不同。调试users_by_city_gender 显示它是一系列城市（A、B 和 C）的数据框，每个城市都包含按性别（M 和 F）的总购买量。所以我认为这是我正确绘制图表所需的数据。
我查看了有关 stackexchange 的其他问题，用于为 pandas 数据框创建堆叠条形图，但我无法找到解决我的问题的方法。
【问题讨论】：