Always initialize class attributes with default values to prevent AttributeError exceptions when accessing potentially undefined values. Use defensive coding patterns:
Always initialize class attributes with default values to prevent AttributeError exceptions when accessing potentially undefined values. Use defensive coding patterns:
__init__() for critical attributeshasattr()) before accessing attributes that might be undefinedExample:
def update(self):
# Initialize with defaults before try block
self.len = 0
self.cap = 0
self.ptr = None
self.elem_type = None
self.elem_size = 0
try:
self.ptr = self.value.GetChildMemberWithName('ptr')
self.len = self.value.GetChildMemberWithName('len').unsigned
self.cap = self.value.GetChildMemberWithName('cap').unsigned
self.elem_type = self.ptr.type.GetPointeeType()
self.elem_size = self.elem_type.size
except:
# Already have default values
pass
def get_child_at_index(self, index):
if index not in range(self.len):
return None
try:
if not hasattr(self, 'ptr') or not hasattr(self, 'elem_size') or not hasattr(self, 'elem_type'):
return None
return self.ptr.CreateChildAtOffset('[%d]' % index, index * self.elem_size, self.elem_type)
except:
return None
This pattern ensures your code is resilient to initialization failures and prevents null reference issues in dependent methods.
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