Pythonic/Panda创建Groupby函数的方法

Pythonic/Panda创建Groupby函数的方法,python,python-3.x,pandas,Python,Python 3.x,Pandas,我对编程相当陌生&我正在寻找一种更具python风格的方法来实现一些代码。以下是虚拟数据: df = pd.DataFrame({ 'Category':np.random.choice( ['Group A','Group B'], 10000), 'Sub-Category':np.random.choice( ['X','Y','Z'], 10000), 'Sub-Category-2':np.random.choice( ['G','F','I'], 10000), 'Product'

我对编程相当陌生&我正在寻找一种更具python风格的方法来实现一些代码。以下是虚拟数据:

 df = pd.DataFrame({
'Category':np.random.choice( ['Group A','Group B'], 10000),
'Sub-Category':np.random.choice( ['X','Y','Z'], 10000),
'Sub-Category-2':np.random.choice( ['G','F','I'], 10000),
'Product':np.random.choice( ['Product 1','Product 2','Product 3'], 10000),
'Units_Sold':np.random.randint(1,100, size=(10000)),
'Dollars_Sold':np.random.randint(100,1000, size=10000), 
'Customer':np.random.choice(pd.util.testing.rands_array(10,25,dtype='str'),10000),
'Date':np.random.choice( pd.date_range('1/1/2016','12/31/2018',  
                  freq='D'), 10000)})
我有很多这样的事务数据,我在上面执行各种Groupby。我目前的解决方案是制作一个主groupby,如下所示:

master = df.groupby(['Customer','Category','Sub-Category','Product',pd.Grouper(key='Date',freq='A')])['Units_Sold'].sum()\
.unstack()
在此基础上,我使用.groupby(level=)函数执行各种groupby,以我所寻找的方式聚合信息。我通常会在每一级做一个总结。此外,我使用下面代码的一些变体在每个级别创建小计

y = master.groupby(level=[0,1,2]).sum()
y.index = pd.MultiIndex.from_arrays([
    y.index.get_level_values(0),
    y.index.get_level_values(1),
    y.index.get_level_values(2) + ' Total',
    len(y.index)*['']
])

y1 = master.groupby(level=[0,1]).sum()
y1.index = pd.MultiIndex.from_arrays([
    y1.index.get_level_values(0),
    y1.index.get_level_values(1)+ ' Total',
    len(y1.index)*[''],
    len(y1.index)*['']
])

y2 = master.groupby(level=[0]).sum()
y2.index = pd.MultiIndex.from_arrays([
    y2.index.get_level_values(0)+ ' Total',
    len(y2.index)*[''],
    len(y2.index)*[''],
    len(y2.index)*['']
])

pd.concat([master,y,y1,y2]).sort_index()\
    .assign(Diff = lambda x: x.iloc[:,-1] - x.iloc[:,-2])\
    .assign(Diff_Perc = lambda x: (x.iloc[:,-2] / x.iloc[:,-3])- 1)\
    .dropna(how='all')\
这只是一个例子-我可以执行相同的练习,但以不同的顺序执行groupby。例如,接下来我可能想按“类别”、“产品”和“客户”进行分组,因此我必须: master.groupby(级别=[1,3,0).sum()

然后,我将不得不对上述小计重复整个练习。我还经常更改时间段-可能是一年结束的特定月份,可能是今年迄今,可能是按季度,等等

从我到目前为止在编程方面所学的知识(这显然是最小的!)来看,您应该在任何时候重复代码时编写函数

是否有一种方法可以构造一个函数,在该函数中,您可以向Groupby提供级别以及时间范围,同时为每个级别创建一个函数


感谢您对这方面的任何指导。非常感谢.E/P> < P>对于一个干燥的ER解决方案,考虑将当前的方法归纳为一个定义的模块,它通过日期范围过滤原始数据帧并运行聚合,接收<代码> GROPY按级别和日期范围(后者是可选的)。作为传入参数:

方法

def multiple_agg(mylevels, start_date='2016-01-01', end_date='2018-12-31'):

    filter_df = df[df['Date'].between(start_date, end_date)]

    master = (filter_df.groupby(['Customer', 'Category', 'Sub-Category', 'Product', 
                     pd.Grouper(key='Date',freq='A')])['Units_Sold']
                .sum()
                .unstack()
              )

    y = master.groupby(level=mylevels[:-1]).sum()
    y.index = pd.MultiIndex.from_arrays([
        y.index.get_level_values(0),
        y.index.get_level_values(1),
        y.index.get_level_values(2) + ' Total',
        len(y.index)*['']
    ])

    y1 = master.groupby(level=mylevels[0:2]).sum()
    y1.index = pd.MultiIndex.from_arrays([
        y1.index.get_level_values(0),
        y1.index.get_level_values(1)+ ' Total',
        len(y1.index)*[''],
        len(y1.index)*['']
    ])

    y2 = master.groupby(level=mylevels[0]).sum()
    y2.index = pd.MultiIndex.from_arrays([
        y2.index.get_level_values(0)+ ' Total',
        len(y2.index)*[''],
        len(y2.index)*[''],
        len(y2.index)*['']
    ])

    final_df = (pd.concat([master,y,y1,y2])
                         .sort_index()
                         .assign(Diff = lambda x: x.iloc[:,-1] - x.iloc[:,-2])
                         .assign(Diff_Perc = lambda x: (x.iloc[:,-2] / x.iloc[:,-3])- 1)
                         .dropna(how='all')
                         .reorder_levels(mylevels)
                )

    return final_df
聚合运行(不同级别和日期范围)

测试
final_df
是OP的
pd.concat()
输出)


我想您可以使用
sum
level
参数来实现:

master = df.groupby(['Customer','Category','Sub-Category','Product',pd.Grouper(key='Date',freq='A')])['Units_Sold'].sum()\
.unstack()
s1 = master.sum(level=[0,1,2]).assign(Product='Total').set_index('Product',append=True)
s2 = master.sum(level=[0,1])

# Wanted to use assign method but because of the hyphen in the column name you can't.
# Also use the Z in front for sorting purposes
s2['Sub-Category'] = 'ZTotal'
s2['Product'] = ''
s2 = s2.set_index(['Sub-Category','Product'], append=True)

s3 = master.sum(level=[0])
s3['Category'] = 'Total'
s3['Sub-Category'] = ''
s3['Product'] = ''
s3 = s3.set_index(['Category','Sub-Category','Product'], append=True)

master_new = pd.concat([master,s1,s2,s3]).sort_index()
master_new
输出:

Date                                        2016-12-31  2017-12-31  2018-12-31
Customer   Category Sub-Category Product                                      
30XWmt1jm0 Group A  X            Product 1       651.0       341.0       453.0
                                 Product 2       267.0       445.0       117.0
                                 Product 3       186.0       280.0       352.0
                                 Total          1104.0      1066.0       922.0
                    Y            Product 1       426.0       417.0       670.0
                                 Product 2       362.0       210.0       380.0
                                 Product 3       232.0       290.0       430.0
                                 Total          1020.0       917.0      1480.0
                    Z            Product 1       196.0       212.0       703.0
                                 Product 2       277.0       340.0       579.0
                                 Product 3       416.0       392.0       259.0
                                 Total           889.0       944.0      1541.0
                    ZTotal                      3013.0      2927.0      3943.0
           Group B  X            Product 1       356.0       230.0       407.0
                                 Product 2       402.0       370.0       590.0
                                 Product 3       262.0       381.0       377.0
                                 Total          1020.0       981.0      1374.0
                    Y            Product 1       575.0       314.0       643.0
                                 Product 2       557.0       375.0       411.0
                                 Product 3       344.0       246.0       280.0
                                 Total          1476.0       935.0      1334.0
                    Z            Product 1       278.0       152.0       392.0
                                 Product 2       149.0       596.0       303.0
                                 Product 3       234.0       505.0       521.0
                                 Total           661.0      1253.0      1216.0
                    ZTotal                      3157.0      3169.0      3924.0
           Total                                6170.0      6096.0      7867.0
3U2anYOD6o Group A  X            Product 1       214.0       443.0       195.0
                                 Product 2       170.0       220.0       423.0
                                 Product 3       111.0       469.0       369.0
...                                                ...         ...         ...
somc22Y2Hi Group B  Z            Total           906.0      1063.0       680.0
                    ZTotal                      3070.0      3751.0      2736.0
           Total                                6435.0      7187.0      6474.0
zRZq6MSKuS Group A  X            Product 1       421.0       182.0       387.0
                                 Product 2       359.0       287.0       331.0
                                 Product 3       232.0       394.0       279.0
                                 Total          1012.0       863.0       997.0
                    Y            Product 1       245.0       366.0       111.0
                                 Product 2       377.0       148.0       239.0
                                 Product 3       372.0       219.0       310.0
                                 Total           994.0       733.0       660.0
                    Z            Product 1       280.0       363.0       354.0
                                 Product 2       384.0       604.0       178.0
                                 Product 3       219.0       462.0       366.0
                                 Total           883.0      1429.0       898.0
                    ZTotal                      2889.0      3025.0      2555.0
           Group B  X            Product 1       466.0       413.0       187.0
                                 Product 2       502.0       370.0       368.0
                                 Product 3       745.0       480.0       318.0
                                 Total          1713.0      1263.0       873.0
                    Y            Product 1       218.0       226.0       385.0
                                 Product 2       123.0       382.0       570.0
                                 Product 3       173.0       572.0       327.0
                                 Total           514.0      1180.0      1282.0
                    Z            Product 1       480.0       317.0       604.0
                                 Product 2       256.0       215.0       572.0
                                 Product 3       463.0        50.0       349.0
                                 Total          1199.0       582.0      1525.0
                    ZTotal                      3426.0      3025.0      3680.0
           Total                                6315.0      6050.0      6235.0

[675 rows x 3 columns]

你的
y2
真的是你的意思吗,还是应该是
level=[0]
?你说得对&我对它进行了编辑以反映这一点。谢谢!非常感谢你的帮助!我正在尝试更好地理解函数-当我运行不同的聚合时,agg_df1返回我期望的结果,包括小计。当我运行aagg_df2和agg_df3时,它不会返回我期望的结果-顺序与agg_df1 e中的相同即使你通过了不同的级别?而且,小计部分也不见了。最后,我似乎无法让你的测试部分发挥作用。非常感谢你的帮助!另外两个agg_dfs正在演示如何按照你的指示更改参数。因此,不,它们与你发布的任何内容都不匹配。根据你的具体需要进行调整。你可以需要将您的
pd.concat()
输出分配给最终的_df变量。并且确保在顶部添加
np.random.seed(##############################)
以复制相同的随机数。再次感谢!很抱歉,不清楚,我的意思是运行“multiple,start_date='2017-01-01',end_date='2018-12-31')返回相同的多索引(客户,然后是类别,子类别,然后是产品)。我认为多索引顺序会根据级别传递的顺序而变化。我明白了。它可以归结为函数末尾的
pd.concat
。由于主项是第一项,因此它会根据其索引顺序进行追加。但是,可以使用MyLevel参数。但您现在必须传递一个包含4个数字的列表,其中最后一个数字在聚合中从未使用过。请参阅“编辑”。@Parfait Nice solution。谢谢,Scott。这是一个很好的解决方案,我将继续使用它创建小计。我希望将它变成一个类似函数的解决方案,我可以将级别和日期传递给-有什么建议吗?
master = df.groupby(['Customer','Category','Sub-Category','Product',pd.Grouper(key='Date',freq='A')])['Units_Sold'].sum()\
.unstack()
s1 = master.sum(level=[0,1,2]).assign(Product='Total').set_index('Product',append=True)
s2 = master.sum(level=[0,1])

# Wanted to use assign method but because of the hyphen in the column name you can't.
# Also use the Z in front for sorting purposes
s2['Sub-Category'] = 'ZTotal'
s2['Product'] = ''
s2 = s2.set_index(['Sub-Category','Product'], append=True)

s3 = master.sum(level=[0])
s3['Category'] = 'Total'
s3['Sub-Category'] = ''
s3['Product'] = ''
s3 = s3.set_index(['Category','Sub-Category','Product'], append=True)

master_new = pd.concat([master,s1,s2,s3]).sort_index()
master_new
Date                                        2016-12-31  2017-12-31  2018-12-31
Customer   Category Sub-Category Product                                      
30XWmt1jm0 Group A  X            Product 1       651.0       341.0       453.0
                                 Product 2       267.0       445.0       117.0
                                 Product 3       186.0       280.0       352.0
                                 Total          1104.0      1066.0       922.0
                    Y            Product 1       426.0       417.0       670.0
                                 Product 2       362.0       210.0       380.0
                                 Product 3       232.0       290.0       430.0
                                 Total          1020.0       917.0      1480.0
                    Z            Product 1       196.0       212.0       703.0
                                 Product 2       277.0       340.0       579.0
                                 Product 3       416.0       392.0       259.0
                                 Total           889.0       944.0      1541.0
                    ZTotal                      3013.0      2927.0      3943.0
           Group B  X            Product 1       356.0       230.0       407.0
                                 Product 2       402.0       370.0       590.0
                                 Product 3       262.0       381.0       377.0
                                 Total          1020.0       981.0      1374.0
                    Y            Product 1       575.0       314.0       643.0
                                 Product 2       557.0       375.0       411.0
                                 Product 3       344.0       246.0       280.0
                                 Total          1476.0       935.0      1334.0
                    Z            Product 1       278.0       152.0       392.0
                                 Product 2       149.0       596.0       303.0
                                 Product 3       234.0       505.0       521.0
                                 Total           661.0      1253.0      1216.0
                    ZTotal                      3157.0      3169.0      3924.0
           Total                                6170.0      6096.0      7867.0
3U2anYOD6o Group A  X            Product 1       214.0       443.0       195.0
                                 Product 2       170.0       220.0       423.0
                                 Product 3       111.0       469.0       369.0
...                                                ...         ...         ...
somc22Y2Hi Group B  Z            Total           906.0      1063.0       680.0
                    ZTotal                      3070.0      3751.0      2736.0
           Total                                6435.0      7187.0      6474.0
zRZq6MSKuS Group A  X            Product 1       421.0       182.0       387.0
                                 Product 2       359.0       287.0       331.0
                                 Product 3       232.0       394.0       279.0
                                 Total          1012.0       863.0       997.0
                    Y            Product 1       245.0       366.0       111.0
                                 Product 2       377.0       148.0       239.0
                                 Product 3       372.0       219.0       310.0
                                 Total           994.0       733.0       660.0
                    Z            Product 1       280.0       363.0       354.0
                                 Product 2       384.0       604.0       178.0
                                 Product 3       219.0       462.0       366.0
                                 Total           883.0      1429.0       898.0
                    ZTotal                      2889.0      3025.0      2555.0
           Group B  X            Product 1       466.0       413.0       187.0
                                 Product 2       502.0       370.0       368.0
                                 Product 3       745.0       480.0       318.0
                                 Total          1713.0      1263.0       873.0
                    Y            Product 1       218.0       226.0       385.0
                                 Product 2       123.0       382.0       570.0
                                 Product 3       173.0       572.0       327.0
                                 Total           514.0      1180.0      1282.0
                    Z            Product 1       480.0       317.0       604.0
                                 Product 2       256.0       215.0       572.0
                                 Product 3       463.0        50.0       349.0
                                 Total          1199.0       582.0      1525.0
                    ZTotal                      3426.0      3025.0      3680.0
           Total                                6315.0      6050.0      6235.0

[675 rows x 3 columns]