代码语言：javascript复制
# -----------------------
# __Author : tyran
# __Date : 17-11-13
# -----------------------
# 异常处理
try:
# 代码逻辑,只要其中任意一行报错都会被捕捉
i = int('aaa')
print(i)
except Exception as e: # 如果出错执行
# 捕捉错误
print(e) # invalid literal for int() with base 10: 'aaa'
else:
print('no Error') # 当没有错误的时候才执行
finally: # 不管出不出错一定会执行
print('over')
# 这里的Exception是一个包容所有错误的类，当然也可以写一些分类
try:
s = 'aaa'
print(s[5])
except IndexError as e:
print(e) # string index out of range
except IOError as e:
print(e)
# 这里也可以用另外一种写法
try:
s = aaa
print(s[5])
except (IndexError, NameError) as e:
print(e) # name 'aaa' is not defined
# 再来看主动触发异常
try:
raise Exception('自首')
except Exception as e:
print(e) # 自首
# 自定义主动触发错误
class MyError(Exception):
def __init__(self, msg):
self.message = msg
def __str__(self):
return self.message
try:
raise MyError('我错了')
except MyError as e:
print(e) # 我错了
# assert 断言
print(123)
assert 1 == 1 # assert 条件，满足就执行下去，不满足报错
print(456)
print(123)
assert False # AssertionError
print(456)
