Python基礎(chǔ)之語(yǔ)法錯(cuò)誤和異常詳解

try:
    # age_str = input("====>")
    # age = int(age_str)
 
    # l1 = []
    # l1[2]
 
    d1 = {}
    d1["name"]
 
except ValueError as e:
    print(e)
except IndexError as e:
    print(e)
except KeyError as e:
    print("KeyError:", e)
except Exception as e:
    print("其他未知異常")

# 異常的其他結(jié)構(gòu)
s = "a"
s = 1
try:
    int(s)
except ValueError as e:
    print(e)
except KeyError as e:
    print(e)
except IndexError as e:
    print(e)
except Exception as e:
    print("捕獲未知異常")
else:
    print("try 包含的代碼塊沒(méi)有異常，執(zhí)行else 里面的代碼")
finally:
    print("執(zhí)行finally 的代碼，通常用于釋放資源")

s = "a"
try:
    int(s)
except ValueError as e:
    print(e)
finally:
    print("執(zhí)行finally 的代碼，通常用于釋放資源")

# 主動(dòng)觸發(fā)異常
try:
    raise TypeError("這個(gè)異常是主動(dòng)觸發(fā)的")
except TypeError as e:
    print(e)

# 自定義異常
class MyException(BaseException):
    def __init__(self, msg):
        self.msg = msg
 
    def __str__(self):
        return "MyException:{}>".format(self.msg)
 
try:
    raise MyException("自定義異常")
except MyException as e:
    print(e)

assert 1 == 2
 
if 1 != 2:
    raise AssertionError