我们在处理程序异常的时候，可能需要自己定义一些传入的message，自己定义一些error对应的error_code，在后续做异常统计的时候可以有自定义的数据，这时候其实我们可以自定义异常捕获类。
异常类一般都是继承自Exception，自定义异常类如下：
class PangolinException(Exception):
"""
Customized Exception for Pangolin Style Inspection Test
Exception raised for errors in the input salary.
Attributes:
msg -- error message
code -- error attribution
"""
msg, code = "", 0
def __init__(self, **kwargs):
for k, v in kwargs.items():
setattr(self, k, v)
class UnknownException(PangolinException):
code = 100
class ClickableItemClickFailedException(PangolinException):
"""
clickable item clicking failed
"""
msg = "failed to click item"
code = 1
class ClickableItemNotFoundException(PangolinException):
"""
clickable item not found
"""
msg = "clickable item not found"
code = 2
定义了异常类之后，可以在程序可能出现这些异常的时候，raise这些异常
def random_click(self, item, items) -> ClickInfo:
if len(items) == 0:
raise ClickableItemClickFailedException()
if not self.is_clickable(item):
logger.info("item is not visible, retry")
raise ClickableItemClickFailedException(msg="item is not visible")
item_attr, item_rect = self.click_item(item)
return ClickInfo(result=True, click_area=item_attr, x=item_rect.center[0], y=item_rect.center[1], error=[])
并在相应的时候去进行捕获
def click(self, item, items) -> ClickInfo:
error_list = []
try:
result: ClickInfo = self.random_click(item, items)
except Exception as e:
# 此时捕获到的是具体的异常类实例
error_list.append(e)
for error in error_list:
print("msg={}, code={}".format(error.msg, error.code))
如果之前raise的异常是ClickableItemNotFoundException，那将打印出
msg=item is not visible, code=2
如果raise的异常是ClickableItemClickFailedException，那将打印出
msg=failed to click item, code=1
