为什么我在调用 vDataFrame.count 时看到的是一个表格，而不仅仅是平均值

这是我Jupyter编写的代码的代码VerticaPy- https://www.vertica.com/python/documentation_last/vdataframe/statistics.php

我已经vDataFrame为一个表创建了一个并且想要找到avg一个列

import vertica_python
conn_info = {'host': '127.0.0.1',
             'port': 5433,
             'user': 'dbadmin',
             'password': '',
             'database': 'kaggle_titanic'}


vdf_table = vDataFrame("titanic_train_flex_view")
mean = vdf_table["age"].mean
mean

我希望看到一个值，mean但我看到了表格本身。为什么我看不到 的一个值mean？

<bound method vColumn.avg of         age  
1      22.0  
2      38.0  
3      26.0  
4      35.0  
5      35.0  
6      None  
7      54.0  
8       2.0  
9      27.0  
10     14.0  
11      4.0  
12     58.0  
13     20.0  
14     39.0  
15     14.0  
16     55.0  
17      2.0  
18     None  
19     31.0  
20     None  
21     35.0  
22     34.0  
23     15.0  
24     28.0  
25      8.0  
26     38.0  
27     None  
28     19.0  
29     None  
30     None  
31     40.0  
32     None  
33     None  
34     66.0  
35     28.0  
36     42.0  
37     None  
38     21.0  
39     18.0  
40     14.0  
41     40.0  
42     27.0  
43     None  
44      3.0  
45     19.0  
46     None  
47     None  
48     None  
49     None  
50     18.0  
51      7.0  
52     21.0  
53     49.0  
54     29.0  
55     65.0  
56     None  
57     21.0  
58     28.5  
59      5.0  
60     11.0  
61     22.0  
62     38.0  
63     45.0  
64      4.0  
65     None  
66     None  
67     29.0  
68     19.0  
69     17.0  
70     26.0  
71     32.0  
72     16.0  
73     21.0  
74     26.0  
75     32.0  
76     25.0  
77     None  
78     None  
79     0.83  
80     30.0  
81     22.0  
82     29.0  
83     None  
84     28.0  
85     17.0  
86     33.0  
87     16.0  
88     None  
89     23.0  
90     24.0  
91     29.0  
92     20.0  
93     46.0  
94     26.0  
95     59.0  
96     None  
97     71.0  
98     23.0  
99     34.0  
100    34.0  
...     ...  
Rows: 1-100 of 891 | Column: age | Type: Numeric(6,3)>