Question

每个客户都有多个计划时，他们就会重复。我想将状态设置为客户：

如果他们的每个产品都填充了“ canceled_at”，则取消客户状态，但是当不是每个产品都填充了“ canceled_at”，而是至少一个产品时，状态为“降级”，因为他丢失了产品。

>

customer|canceled_at|status
x       |3/27/2018  |
x       |           |
y       |2/2/2018   |
y       |2/2/2018   |
z       |1/1/2018   |
a       |           |

我已经处于取消状态，现在我只需要降级

df['status']=(df.groupby('customer')['canceled_at'].
  transform(lambda x: x.notna().all()).map({True:'canceled'})).fillna(df.status)

customer|canceled_at|status
x       |3/27/2018  |downgrade
x       |           |downgrade
y       |2/2/2018   |canceled
y       |2/2/2018   |canceled
z       |1/1/2018   |canceled
a       |           |

Answer 1

在这里可以比较列中没有缺失值，并按Series customer与GroupBy.transform和GroupBy.all进行分组， GroupBy.any测试所有值True（全部不丢失）或至少一个不丢失值（所有不丢失）并将其传递给numpy.select：

g = df['canceled_at'].notna().groupby(df['customer'])
m1 = g.transform('all')
m2 = g.transform('any')

df['status'] = np.select([m1, m2],['canceled','downgrade'], np.nan)
print (df)
  customer canceled_at     status
0        x   3/27/2018  downgrade
1        x         NaN  downgrade
2        y    2/2/2018   canceled
3        y    2/2/2018   canceled
4        z    1/1/2018   canceled
5        a         NaN        nan

或者：

df['status'] = np.select([m1, m2],['canceled','downgrade'], '')
print (df)
  customer canceled_at     status
0        x   3/27/2018  downgrade
1        x         NaN  downgrade
2        y    2/2/2018   canceled
3        y    2/2/2018   canceled
4        z    1/1/2018   canceled
5        a         NaN

如果仅NaN个群组需要转换为downgrade：

mask = df['canceled_at'].notna().groupby(df['customer']).transform('all')
df['status'] = np.where(mask,'canceled','downgrade')
print (df)
  customer canceled_at     status
0        x   3/27/2018  downgrade
1        x         NaN  downgrade
2        y    2/2/2018   canceled
3        y    2/2/2018   canceled
4        z    1/1/2018   canceled
5        a         NaN  downgrade

Answer 2

这是一种实现方法：

import pandas as pd

def select_status(canceled):
    c = canceled.count()
    if c == 0:
        status = ''
    elif c == len(canceled):
        status = 'canceled'
    else:
        status = 'downgrade'
    return pd.Series(status, index=canceled.index)

df = pd.DataFrame({'customer': ['x', 'x', 'y', 'y', 'z', 'a'],
                   'canceled_at': ['3/27/2018', None, '2/2/2018', '2/2/2018', '1/1/2018', None]})
df['status'] = df.groupby('customer')['canceled_at'].apply(select_status)
print(df)

输出：

  customer canceled_at     status
0        x   3/27/2018  downgrade
1        x        None  downgrade
2        y    2/2/2018   canceled
3        y    2/2/2018   canceled
4        z    1/1/2018   canceled
5        a        None

列中重复值之间的条件

2 个答案: