在Python数据框中获取部分时间（早上，下午，晚上，晚上）

Question

这是我的数据框，我需要根据时间值创建一个新列，行值是（早上，下午，晚上，晚上）

这是我的代码

if ((prods['hour'] < 4) & (prods['hour'] > 8 )):
    prods['session'] = 'Early Morning'
elif ((prods['hour'] < 8) & (prods['hour'] > 12 )):
    prods['session'] = 'Morning'
elif ((prods['hour'] < 12) & (prods['hour'] > 16 )):
    prods['session'] = 'Noon'
elif ((prods['hour'] < 16) & (prods['hour'] > 20 )):
    prods['session'] = 'Eve'
elif ((prods['hour'] < 20) & (prods['hour'] > 24 )):
    prods['session'] = 'Night'
elif ((prods['hour'] < 24) & (prods['hour'] > 4 )):
    prods['session'] = 'Late Night'

这是我得到的错误

ValueError Traceback（最近一次调用最后一次）在----> 1 if（prods ['hour']> 4并且prods ['hour'] <8）：2 prods ['session'] ='Early Morning'3 elif （prods ['hour']> 8 and prods ['hour'] <12）：4 prods ['session'] ='Morning'5 elif（prods ['hour']> 12 and prods ['hour'] < 16）：

/anaconda3/lib/python3.7/site-packages/pandas/core/generic.py in nonzero（self）1476引发ValueError（“{0}的真值是不明确的。”1477“使用a.empty，a .bool（），a.item（），a.any（）或a.all（）。“ - > 1478 .format（self.class.name））1479 1480 bool =非零

ValueError：Series的真值是不明确的。使用a.empty，a.bool（），a.item（），a.any（）或a.all（）。

请帮助

Answer 1

使用cut或自定义函数与and，并将<更改为>和>到<=以及每个值添加return：

prods = pd.DataFrame({'hour':range(1, 25)})

b = [0,4,8,12,16,20,24]
l = ['Late Night', 'Early Morning','Morning','Noon','Eve','Night']
prods['session'] = pd.cut(prods['hour'], bins=b, labels=l)

---

def f(x):
    if (x > 4) and (x <= 8):
        return 'Early Morning'
    elif (x > 8) and (x <= 12 ):
        return 'Morning'
    elif (x > 12) and (x <= 16):
        return'Noon'
    elif (x > 16) and (x <= 20) :
        return 'Eve'
    elif (x > 20) and (x <= 24):
        return'Night'
    elif (x <= 4):
        return'Late Night'

---

prods['session1'] = prods['hour'].apply(f)
print (prods)
    hour        session       session1
0      1     Late Night     Late Night
1      2     Late Night     Late Night
2      3     Late Night     Late Night
3      4     Late Night     Late Night
4      5  Early Morning  Early Morning
5      6  Early Morning  Early Morning
6      7  Early Morning  Early Morning
7      8  Early Morning  Early Morning
8      9        Morning        Morning
9     10        Morning        Morning
10    11        Morning        Morning
11    12        Morning        Morning
12    13           Noon           Noon
13    14           Noon           Noon
14    15           Noon           Noon
15    16           Noon           Noon
16    17            Eve            Eve
17    18            Eve            Eve
18    19            Eve            Eve
19    20            Eve            Eve
20    21          Night          Night
21    22          Night          Night
22    23          Night          Night
23    24          Night          Night