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[英]Pandas- Dividing a column by another column conditional on if values are greater than 0?
[英]Pandas- pivoting column into (conditional) aggregated string
假设我有以下数据集,变成了数据帧:
data = [
['Job 1', datetime.date(2019, 6, 9), 'Jim', 'Tom'],
['Job 1', datetime.date(2019, 6, 9), 'Bill', 'Tom'],
['Job 1', datetime.date(2019, 6, 9), 'Tom', 'Tom'],
['Job 1', datetime.date(2019, 6, 10), 'Bill', None],
['Job 2', datetime.date(2019,6,10), 'Tom', 'Tom']
]
df = pd.DataFrame(data, columns=['Job', 'Date', 'Employee', 'Manager'])
这会产生一个如下所示的数据框:
Job Date Employee Manager
0 Job 1 2019-06-09 Jim Tom
1 Job 1 2019-06-09 Bill Tom
2 Job 1 2019-06-09 Tom Tom
3 Job 1 2019-06-10 Bill None
4 Job 2 2019-06-10 Tom Tom
我想要生成的是每个唯一的作业/日期组合的一个轴,一个是Manager列,一个是逗号分隔的非经理员工的字符串列。 有几件事要假设:
我希望结果数据框看起来像:
Job Date Manager Employees
0 Job 1 2019-06-09 Tom Jim, Bill
1 Job 1 2019-06-10 None Bill
2 Job 2 2019-06-10 Tom None
这引出了我的问题:
我怀疑1)是可能的,2)可能更难。 如果2)是no,我可以稍后在我的代码中以其他方式绕过它。
这里棘手的部分是从Employee列中删除Manager。
u = df.melt(['Job', 'Date'])
f = u[~u.duplicated(['Job', 'Date', 'value'], keep='last')].astype(str)
f.pivot_table(
index=['Job', 'Date'],
columns='variable', values='value',
aggfunc=','.join
).rename_axis(None, axis=1)
Employee Manager
Job Date
Job 1 2019-06-09 Jim,Bill Tom
2019-06-10 Bill None
Job 2 2019-06-10 NaN Tom
要聚合的组,然后通过删除管理器并在适当的位置设置为“无”来修复“员工”。 由于员工是独一无二的,因此集合可以很好地删除管理器。
s = df.groupby(['Job', 'Date']).agg({'Manager': 'first', 'Employee': lambda x: set(x)})
s['Employee'] = [', '.join(x.difference({y})) for x,y in zip(s.Employee, s.Manager)]
s['Employee'] = s.Employee.replace({'': None})
Manager Employee
Job Date
Job 1 2019-06-09 Tom Jim, Bill
2019-06-10 None Bill
Job 2 2019-06-10 Tom None
我倾向于用期望的结果构建一个字典并重建数据帧。
d = {}
for t in df.itertuples():
d_ = d.setdefault((t.Job, t.Date), {})
d_['Manager'] = t.Manager
d_.setdefault('Employees', set()).add(t.Employee)
for k, v in d.items():
v['Employees'] -= {v['Manager']}
v['Employees'] = ', '.join(v['Employees'])
pd.DataFrame(d.values(), d).rename_axis(['Job', 'Date']).reset_index()
Job Date Employees Manager
0 Job 1 2019-06-09 Bill, Jim Tom
1 Job 1 2019-06-10 Bill None
2 Job 2 2019-06-10 Tom
在你的情况下,尝试不使用lambda transform
+ drop_duplicates
df['Employee']=df['Employee'].mask(df['Employee'].eq(df.Manager)).dropna().groupby([df['Job'], df['Date']]).transform('unique').str.join(',')
df=df.drop_duplicates(['Job','Date'])
df
Out[745]:
Job Date Employee Manager
0 Job 1 2019-06-09 Jim,Bill Tom
3 Job 1 2019-06-10 Bill None
4 Job 2 2019-06-10 NaN Tom
怎么样
df.groupby(["Job","Date","Manager"]).apply( lambda x: ",".join(x.Employee))
这将找到所有独特的工作日期和经理,并将员工与“,”放在一个字符串中
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