Python:如何测试潜在的变量名称是否在命名空间中？

Question

如何测试命名空间中潜在变量名称列表的哪些元素？我应该将它们初始化为 None 还是它们是更好的方法？

# Potential list. Won't work, will give NameError if one of them is not in the namespace
all_vars = [rds.rclass, \
           rds.rlevel, \
           rds.seg \] # the list is actually much longer

#Could do:
all_vars =[]
try:
   all_vars.append(rds.rclass)
except NameError:
   pass
....

#or as initially said:
rds.rclass = rds.rlevel = ... = None

还有另一种(更好)的方法吗？

Answer 1

可怕，但这应该有效:

all_vars = locals().get('all_vars', [])