Question

我正在尝试从vcenter中提取数据存储区值并执行使用计算，如下所示：

s = VIServer()
s.connect(HOST, USER, PASSWORD)


properties = [  "name",
                "summary.capacity",
                "summary.freeSpace",
             ]

results = s._retrieve_properties_traversal(property_names=properties,
                                           obj_type=MORTypes.Datastore)
d = time.strftime('%Y-%m-%d %H:%M:%S')

for item in results:
    for r in item.PropSet:
                if r.Name == "name" :
                        name = r.Val

    for p in item.PropSet:
        global Total_Space,Free_Space
        if p.Name=="summary.capacity":
                Total_Space=p.Val
                Metric="datastore.space_total"
                print Metric,d,p.Val,"datastore="+name,"source="+"datastore"

        if p.Name=="summary.freeSpace":
                Free_Space=p.Val
                Metric="datastore.space_free"
                print Metric,d,p.Val,"datastore="+name,"source="+"datastore"
        if Total_Space>0 &  Free_Space>0:
                Used_Space=Total_Space-Free_Space
                Used_Percent=(Used_Space/Total_Space)*100

                Metric="datastore.space_used"
                print Metric,d,Used_Space,"datastore="+name,"source="+"datastore"
                Metric="datastore.diskPctUsed"
                print Metric,d,Used_Percent,"datastore="+name,"source="+"datastore"

当我运行时，我收到此错误：

Traceback (most recent call last):
  File "datastore.py", line 41, in <module>
    if Total_Space>0 &  Free_Space>0:
NameError: global name 'Total_Space' is not defined

我有什么想法可以解决这个问题吗？

Answer 1

使用您计划的第一个值初始化Total_Space和Free_Space。

Total_Space = 0
Free_Space = 0

Answer 2

由于您在说'Total_Space'之前未在全球范围内声明global Total_Space，因此您应该全局添加Total_Space = None # or whatever value you like，即在for循环或任何函数之外

Answer 3

从代码逻辑开始，在 for 循环后检查这些值是有意义的。因此，您将确保初始化并检查一次：

 ...
 Total_Space = 0
 Free_Space = 0
 for p in item.PropSet:
     ...

 if Total_Space and Free_Space:
     ...

但是，如果您将它们初始化为无，则可以在 PropSet 中进一步检查是否存在它们：

 ...
 Total_Space = None
 Free_Space = None
 for p in item.PropSet:
     ...

 if Total_Space == None:
     print "error: no Total_Space in PropSet"
 elif Free_Space == None:
     print "error: no Free_Space in PropSet"
 elif Total_Space and Free_Space:
     ...

有些说明：

您应该使用和布尔运算符代替＆amp; 作为按位运算符
此外，＆amp; 有higher priority而不是＆gt; ，表达式将被评估为

如果Total_Space＆gt; （0＆amp; Free_Space）＆gt; 0：
在条件句中，如果值而不是，则可以使用，如果值> 0

无法为python中的变量赋值

3 个答案: