Python 编程 | 连载 18 - 异常处理（上）

try:
    代码块 #被try关键字检查并保护的代码
except <异常类型> # try关键字检查的代码可能出现的异常的种类
    代码块 # try关键字检查的代码出现异常后执行的代码
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def upper(str_data):
    new_str = str_data.upper()
    return new_str
res = upper('hero')
print(res)
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res_01 = upper(111)
print(res_01)
res_02 = upper('hello')
print(res_02)
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def upper(str_data):
    new_str = ''
    try:
        new_str = str_data.upper()
    except:
        print('程序执行出现问题')
    return new_str
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def divid(x, y):
    res = 0
    try:
        res = x / y
    except Exception as e:
        print(e)
    return res
res = divid(1, 2)
print(res)
res_01 = divid(1, 0)
print(res_01)
res_02 = divid(10, 2)
print(res_02)
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def divid(x, y):
    res = x / y
    return res
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def divid(x, y):
    res = 0
    try:
        res = x / y
    except ZeroDivisionError as e:
        print(e)
    return res
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def divid(x, y):
    res = 0
    try:
        res = x / y
    except IndexError as e:
        print(e)
    return res
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try:
    # 代码块
except Eexception1 as e1：
    # 代码块
except EXception2 as e2：
    # 代码块
except EXception3 as e3：
    # 代码块
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try:
    # 代码块
except (Eexception1, Exception2, Exception3) as e：
    # 代码块
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def divid(x, y):
    res = 0
    try:
        res = x / y
    except (IndexError, NameError, ZeroDivisionError) as e:
        print(e)
    return res
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def divid(x, y):
    res = 0
    try:
        res = x / y
    except IndexError as e:
        print(e)
    except NameError as e2:
        print(e2)
    except ZeroDivisionError as e3:
        print(e3)
    return res
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class Student:
    name = None
    age = 7
    def __init__(self, name, age):
        self.name = name
        self.age = age
    def __str__(self):
        return 'Student[name={}, age={}]'.format(self.name, self.age)
stu = Student("stark", 44)
print(stu)
print(stu.address)
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try:
    stu = Student("stark", 44)
    print(stu)
    print(stu.address)
except AttributeError as e:
    print(e)
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dict_01 = {
    'name': 'stark',
    'age': 44
}
print(dict_01['address'])
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