2. 假设当前文件夹中data.csv文件中存放了2020年某饭店营业额，第一列为日期（如2020-02-03），第二列为每天交易额（如3560），文件中第一行为表头，其余行为实 际数据。

假设当前文件夹中data.csv文件中存放了2020年某饭店营业额，第一列为日期（如2020-02-03），第二列为每天交易额（如3560），文件中第一行为表头，其余行为实  际数据。编写程序，完成下面的任务，要求对结果图形进行适当的美化:  （1）使用pandas读取文件data.csv中的数据，创建DataFrame对象，并删除其中所有的缺失值;  （2）绘制第1个月的营业额折线图，反映饭店每天的营业额情况，并把图形保存为本地文件day.jpg；  （3）按月份进行统计，绘制柱状图显示每个月份的营业额，并把图形保存为本地文件month.jpg;  （4）按季度统计该饭店2020年的营业额数据，绘制饼状图显示4个季度的营业额分布情况，并把图形保存为本地文件quarter.jpg。

import matplotlib
import pandas
import matplotlib.pyplot as plt

matplotlib.rcParams['font.sans-serif'] = ['SimHei']  # pyplot中文显示
df = pandas.read_csv("data.csv", engine='python')
df['日期'] = pandas.to_datetime(df['日期'])
df[['交易额']] = df[['交易额']].astype(float)  # 将交易额转换为float类型
df = df.dropna()  # 去除缺失行

plt.figure()
df1 = df.head(31)  # 取第一个月
df1.plot(x='日期')  # 画图，以日期为x轴
plt.savefig('day.jpg')

plt.figure()
df2 = df
df2['月份'] = df2['日期'].map(lambda x: x.month)  # 提取出月份
df2 = df2.groupby(by='月份', as_index=False).sum()  # as_inside=False不把month作为新的index,分组求和
df2.plot(x='月份', kind='bar', y='交易额')
plt.savefig('month.jpg')

plt.figure()
one = df2[:3]['交易额'].sum()
two = df2[3:6]['交易额'].sum()
three = df2[6:9]['交易额'].sum()
four = df2[9:12]['交易额'].sum()
plt.pie([one, two, three, four], labels=['第一季度', '第二季度', '第三季度', '第四季度'])
plt.savefig('quarter.jpg')

日期,交易额
2020/1/1,1886
2020/1/2,1562
2020/1/3,1250
2020/1/4,865
2020/1/5,1250
2020/1/6,316
2020/1/7,607
2020/1/8,487
2020/1/9,293
2020/1/10,450
2020/1/11,525
2020/1/12,791
2020/1/13,711
2020/1/14,876
2020/1/15,685
2020/1/16,968
2020/1/17,1431
2020/1/18,1696
2020/1/19,2013
2020/1/20,2101
2020/1/21,1187
2020/1/22,2865
2020/1/23,2510
2020/1/24,2350
2020/1/25,2034
2020/1/26,1820
2020/1/27,1986
2020/1/28,1176
2020/1/29,1885
2020/1/30,1879
2020/1/31,2056
2020/2/1,1003
2020/2/2,1204
2020/2/3,1045
2020/2/4,1012
2020/2/5,966
2020/2/6,875
2020/2/7,414
2020/2/8,1145
2020/2/9,729
2020/2/10,947
2020/2/11,644
2020/2/12,712
2020/2/13,583
2020/2/14,315
2020/2/15,533
2020/2/16,621
2020/2/17,561
2020/2/18,929
2020/2/19,1264
2020/2/20,749
2020/2/21,964
2020/2/22,864
2020/2/23,449
2020/2/24,1242
2020/2/25,390
2020/2/26,816
2020/2/27,891
2020/2/28,657
2020/2/29,748
2020/3/1,943
2020/3/2,467
2020/3/3,541
2020/3/4,477
2020/3/5,964
2020/3/6,364
2020/3/7,814
2020/3/8,796
2020/3/9,992
2020/3/10,730
2020/3/11,606
2020/3/12,959
2020/3/13,1211
2020/3/14,744
2020/3/15,826
2020/3/16,791
2020/3/17,984
2020/3/18,672
2020/3/19,383
2020/3/20,800
2020/3/21,751
2020/3/22,1377
2020/3/23,1098
2020/3/24,459
2020/3/25,855
2020/3/26,1036
2020/3/27,815
2020/3/28,NaN
2020/3/29,848
2020/3/30,1048
2020/3/31,639
2020/4/1,858
2020/4/2,1070
2020/4/3,685
2020/4/4,1220
2020/4/5,991
2020/4/6,1235
2020/4/7,1316
2020/4/8,208
2020/4/9,458
2020/4/10,1077
2020/4/11,479
2020/4/12,821
2020/4/13,452
2020/4/14,394
2020/4/15,913
2020/4/16,979
2020/4/17,963
2020/4/18,716
2020/4/19,600
2020/4/20,577
2020/4/21,731
2020/4/22,1401
2020/4/23,761
2020/4/24,698
2020/4/25,283
2020/4/26,1255
2020/4/27,338
2020/4/28,1114
2020/4/29,722
2020/4/30,873
2020/5/1,1183
2020/5/2,895
2020/5/3,1063
2020/5/4,823
2020/5/5,380
2020/5/6,712
2020/5/7,449
2020/5/8,910
2020/5/9,603
2020/5/10,944
2020/5/11,267
2020/5/12,1210
2020/5/13,840
2020/5/14,403
2020/5/15,780
2020/5/16,473
2020/5/17,300
2020/5/18,513
2020/5/19,619
2020/5/20,493
2020/5/21,650
2020/5/22,480
2020/5/23,456
2020/5/24,567
2020/5/25,879
2020/5/26,874
2020/5/27,286
2020/5/28,550
2020/5/29,423
2020/5/30,529
2020/5/31,1289
2020/6/1,1087
2020/6/2,510
2020/6/3,548
2020/6/4,1207
2020/6/5,847
2020/6/6,841
2020/6/7,1368
2020/6/8,920
2020/6/9,866
2020/6/10,759
2020/6/11,606
2020/6/12,1472
2020/6/13,563
2020/6/14,795
2020/6/15,NaN
2020/6/16,528
2020/6/17,589
2020/6/18,848
2020/6/19,421
2020/6/20,299
2020/6/21,786
2020/6/22,909
2020/6/23,975
2020/6/24,1132
2020/6/25,372
2020/6/26,1039
2020/6/27,585
2020/6/28,390
2020/6/29,563
2020/6/30,924
2020/7/1,335
2020/7/2,466
2020/7/3,770
2020/7/4,846
2020/7/5,554
2020/7/6,1104
2020/7/7,NaN
2020/7/8,515
2020/7/9,306
2020/7/10,692
2020/7/11,1180
2020/7/12,508
2020/7/13,664
2020/7/14,487
2020/7/15,596
2020/7/16,215
2020/7/17,623
2020/7/18,1075
2020/7/19,868
2020/7/20,508
2020/7/21,838
2020/7/22,216
2020/7/23,305
2020/7/24,1043
2020/7/25,1410
2020/7/26,431
2020/7/27,685
2020/7/28,309
2020/7/29,504
2020/7/30,769
2020/7/31,971
2020/8/1,814
2020/8/2,440
2020/8/3,990
2020/8/4,780
2020/8/5,925
2020/8/6,820
2020/8/7,829
2020/8/8,1227
2020/8/9,356
2020/8/10,594
2020/8/11,793
2020/8/12,622
2020/8/13,888
2020/8/14,981
2020/8/15,1268
2020/8/16,272
2020/8/17,703
2020/8/18,922
2020/8/19,NaN
2020/8/20,601
2020/8/21,913
2020/8/22,537
2020/8/23,709
2020/8/24,387
2020/8/25,594
2020/8/26,517
2020/8/27,830
2020/8/28,889
2020/8/29,1056
2020/8/30,1048
2020/8/31,568
2020/9/1,1310
2020/9/2,596
2020/9/3,1143
2020/9/4,502
2020/9/5,756
2020/9/6,581
2020/9/7,1073
2020/9/8,426
2020/9/9,1113
2020/9/10,646
2020/9/11,1080
2020/9/12,617
2020/9/13,685
2020/9/14,NaN
2020/9/15,811
2020/9/16,742
2020/9/17,838
2020/9/18,1170
2020/9/19,979
2020/9/20,1237
2020/9/21,673
2020/9/22,268
2020/9/23,984
2020/9/24,909
2020/9/25,666
2020/9/26,369
2020/9/27,1357
2020/9/28,932
2020/9/29,563
2020/9/30,2012
2020/10/1,2565
2020/10/2,2157
2020/10/3,2046
2020/10/4,2321
2020/10/5,1966
2020/10/6,1986
2020/10/7,2345
2020/10/8,1117
2020/10/9,999
2020/10/10,1102
2020/10/11,1024
2020/10/12,1135
2020/10/13,962
2020/10/14,975
2020/10/15,663
2020/10/16,823
2020/10/17,NaN
2020/10/18,786
2020/10/19,633
2020/10/20,881
2020/10/21,1161
2020/10/22,522
2020/10/23,471
2020/10/24,586
2020/10/25,589
2020/10/26,1280
2020/10/27,950
2020/10/28,1111
2020/10/29,613
2020/10/30,979
2020/10/31,936
2020/11/1,663
2020/11/2,1140
2020/11/3,751
2020/11/4,1068
2020/11/5,966
2020/11/6,528
2020/11/7,474
2020/11/8,1323
2020/11/9,716
2020/11/10,679
2020/11/11,786
2020/11/12,267
2020/11/13,560
2020/11/14,801
2020/11/15,1060
2020/11/16,685
2020/11/17,992
2020/11/18,984
2020/11/19,884
2020/11/20,514
2020/11/21,879
2020/11/22,1245
2020/11/23,537
2020/11/24,759
2020/11/25,571
2020/11/26,883
2020/11/27,1040
2020/11/28,830
2020/11/29,1019
2020/11/30,1072
2020/12/1,805
2020/12/2,691
2020/12/3,899
2020/12/4,986
2020/12/5,799
2020/12/6,876
2020/12/7,1292
2020/12/8,482
2020/12/9,804
2020/12/10,1028
2020/12/11,817
2020/12/12,415
2020/12/13,498
2020/12/14,1108
2020/12/15,986
2020/12/16,845
2020/12/17,882
2020/12/18,741
2020/12/19,1082
2020/12/20,1280
2020/12/21,519
2020/12/22,739
2020/12/23,792
2020/12/24,714
2020/12/25,1339
2020/12/26,1460
2020/12/27,989
2020/12/28,1053
2020/12/29,1263
2020/12/30,1264
2020/12/31,1123