如何在一行python代码中应用两个不同的条件？

Question

根据下表：

FamilyVsWWTotal = pd.DataFrame({'date':['2011-4-3','2011-3-5','2011-4-3','2011-5-7'], 'Country':['USA','CAN','USA','MEX'],'Revenues':[1200,1800,1000,800],'Customer':['Exxon','Google','Google','Microsoft']})

FamilyVsWWTotal = FamilyVsWWTotal.loc[FamilyVsWWTotal['Customer'] == 'Google']
FamilyVsWWTotal['total1'] = FamilyVsWWTotal.groupby(['date','Country'])['Revenues']\
                                           .transform('sum')

FamilyVsWWTotal['total1']是创建的新列。那么，如何将上述代码组合成一行代码呢？你知道吗

Answer 1

FamilyVsWWTotal.assign(total1=FamilyVsWWTotal[FamilyVsWWTotal.Customer.eq('Google')].groupby(['date', 'Country']).Revenues.transform('sum'))

  Country   Customer  Revenues      date  total1
0     USA      Exxon      1200  2011-4-3     NaN
1     CAN     Google      1800  2011-3-5  1800.0
2     USA     Google      1000  2011-4-3  1000.0
3     MEX  Microsoft       800  2011-5-7     NaN

---

同样的事情，但打破了秩序

FamilyVsWWTotal.assign(
    total1=FamilyVsWWTotal[FamilyVsWWTotal.Customer.eq('Google')].groupby(
        ['date', 'Country']
    ).Revenues.transform('sum')
)

  Country   Customer  Revenues      date  total1
0     USA      Exxon      1200  2011-4-3     NaN
1     CAN     Google      1800  2011-3-5  1800.0
2     USA     Google      1000  2011-4-3  1000.0
3     MEX  Microsoft       800  2011-5-7     NaN

Answer 2

您可以计算一个inset并将其粘贴到原始数据帧中。笨拙，但与众不同。你知道吗

rows = FamilyVsWWTotal['Customer'] == 'Google'
inset = FamilyVsWWTotal[rows].groupby(['date', 'Country'])['Revenues'].sum()
FamilyVsWWTotal.set_index(['date', 'Country'], inplace=True)
rows = FamilyVsWWTotal['Customer'] == 'Google'
FamilyVsWWTotal.loc[rows,'total1'] = inset
FamilyVsWWTotal.reset_index(inplace = True)

#       date Country   Customer  Revenues  total1
#0  2011-4-3     USA      Exxon      1200     NaN
#1  2011-3-5     CAN     Google      1800  1800.0
#2  2011-4-3     USA     Google      1000  1000.0
#3  2011-5-7     MEX  Microsoft       800     NaN

Answer 3

我认为您需要先筛选，然后再将输出添加到筛选列：

m = FamilyVsWWTotal['Customer'] == 'Google'

FamilyVsWWTotal.loc[m, 'total1']=FamilyVsWWTotal[m].groupby(['date','Country'])['Revenues']\
                                                   .transform('sum')

print (FamilyVsWWTotal)
  Country   Customer  Revenues      date  total1
0     USA      Exxon      1200  2011-4-3     NaN
1     CAN     Google      1800  2011-3-5  1800.0
2     USA     Google      1000  2011-4-3  1000.0
3     MEX  Microsoft       800  2011-5-7     NaN

对于单行解决方案：

FamilyVsWWTotal.loc[FamilyVsWWTotal['Customer'] == 'Google', 'total1'] = \
FamilyVsWWTotal[FamilyVsWWTotal['Customer']=='Google'].groupby(['date','Country'])['Revenues']\
                                                      .transform('sum')

print (FamilyVsWWTotal)
  Country   Customer  Revenues      date  total1
0     USA      Exxon      1200  2011-4-3     NaN
1     CAN     Google      1800  2011-3-5  1800.0
2     USA     Google      1000  2011-4-3  1000.0
3     MEX  Microsoft       800  2011-5-7     NaN