python基础学习（九）

19.解包

# 解包 unpacking
user1 = ["张三", 21, "1999.1.1"]
# tuple 类型
user2 = ("李四", 21, "1999.10.1")

# user_name = user[0]
# user_age = user[1]
# user_bir = user[2]

# 更简单的方式把列表元素 附给变量
user_name1, user_age1, user_bir1 = user1
# age和name换了位置  仔细看结果！！！
user_age2, user_name2, user_bir2 = user2


print("name1:"+user_name1)
print("age1:" + str(user_age1))
print("bir1:"+user_bir1)
print("-----------帅气分割线-----------------")
print("name2:"+str(user_name2))
print("age2:"+user_age2)
print("bir2:"+user_bir2)
print("李四的名字和age 位置反了 这说明是按照顺序来赋值的")

run结果：

 20.异常处理

错误总结版本：

# 异常 exception   运行时候检测到的错误为 异常
# 错误 error

# File "/home/yangbin/Study/IdeaProjects/pythonWork/day3/异常处理.py", line 5
# if True
#       ^
# SyntaxError: invalid syntax
if True
    print("Hello SongKe")

# File "/home/yangbin/Study/IdeaProjects/pythonWork/day3/异常处理.py", line 13
#    print("Hello SongKe1")
#        ^
# IndentationError: expected an indented block
if True:
print("Hello SongKe1")

# File "/home/yangbin/Study/IdeaProjects/pythonWork/day3/异常处理.py", line 19
#     print(str_hi)
#     ^
# IndentationError: unexpected indent
str_hi = "Hello SongKe2"
    print(str_hi)

# 请输入num：松柯
# Traceback (most recent call last):
#   File "/home/yangbin/Study/IdeaProjects/pythonWork/day3/异常处理.py", line 26, in <module>
#     num = int(input("请输入num："))
# ValueError: invalid literal for int() with base 10: '松柯'
num1 = int(input("请输入num1："))
print(num1)

# 包起来 可能出现异常的代码
try:
    num2 = int(input("请输入num2："))
    print(num2)
except:
    print("error input")

    # Traceback (most recent call last):
    #   File "/home/yangbin/Study/IdeaProjects/pythonWork/day3/异常处理.py", line 40, in <module>
    #     num = 1/0
    # ZeroDivisionError: division by zero
    # 分母不能为0
    # num = 1 / 0

# 当输入0 时候 不知道是字符串转换引起的还是 输入0引起的异常  还需要能处理不同情况的
# 请输入num3：0
# division by zero
# -------------------------------------------------
# 请输入num3：松柯
# invalid literal for int() with base 10: '松柯'
try:
    num3 = int(input("请输入num3："))
    result = 1 / num3
    print(result)
    # ZeroDivisionError 分母为0的异
except ZeroDivisionError as error:
    print(error)
    # ValueError 输入异常
except ValueError as error:
    print(error)


def test_fails(num4):
    return 1 / num4


try:
    num4 = int(input("请输入num4："))
    result1 = test_fails(num4)
    print(result1)
    # ZeroDivisionError 分母为0的异常
except ZeroDivisionError as error:
    print(error)
    # ValueError 输入异常
except ValueError as error:
    print(error)

正常版本：

# 异常 exception   运行时候检测到的错误为 异常
# 错误 error

# File "/home/yangbin/Study/IdeaProjects/pythonWork/day3/异常处理.py", line 5
# if True
#       ^
# SyntaxError: invalid syntax
if True:
    print("Hello SongKe")

# File "/home/yangbin/Study/IdeaProjects/pythonWork/day3/异常处理.py", line 13
#    print("Hello SongKe1")
#        ^
# IndentationError: expected an indented block
if True:
    print("Hello SongKe1")

# File "/home/yangbin/Study/IdeaProjects/pythonWork/day3/异常处理.py", line 19
#     print(str_hi)
#     ^
# IndentationError: unexpected indent
str_hi = "Hello SongKe2"
print(str_hi)

# 请输入num：松柯
# Traceback (most recent call last):
#   File "/home/yangbin/Study/IdeaProjects/pythonWork/day3/异常处理.py", line 26, in <module>
#     num = int(input("请输入num："))
# ValueError: invalid literal for int() with base 10: '松柯'
num1 = int(input("请输入num1："))
print(num1)

# 包起来 可能出现异常的代码
try:
    num2 = int(input("请输入num2："))
    print(num2)
except:
    print("error input")

    # Traceback (most recent call last):
    #   File "/home/yangbin/Study/IdeaProjects/pythonWork/day3/异常处理.py", line 40, in <module>
    #     num = 1/0
    # ZeroDivisionError: division by zero
    # 分母不能为0
    # num = 1 / 0

# 当输入0 时候 不知道是字符串转换引起的还是 输入0引起的异常  还需要能处理不同情况的
# 请输入num3：0
# division by zero
# -------------------------------------------------
# 请输入num3：松柯
# invalid literal for int() with base 10: '松柯'
try:
    num3 = int(input("请输入num3："))
    result = 1 / num3
    print(result)
    # ZeroDivisionError 分母为0的异
except ZeroDivisionError as error:
    print(error)
    # ValueError 输入异常
except ValueError as error:
    print(error)


def test_fails(num4):
    return 1 / num4


try:
    num4 = int(input("请输入num4："))
    result1 = test_fails(num4)
    print(result1)
    # ZeroDivisionError 分母为0的异常
except ZeroDivisionError as error:
    print(error)
    # ValueError 输入异常
except ValueError as error:
    print(error)

run结果：