python based learning (IX)

19. unpack

# Unpack unpacking
user1 = ["张三", 21, "1999.1.1"]
# Tuple type
user2 = ("李四", 21, "1999.10.1")

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

# Easier way to list elements attached to the variable
user_name1, user_age1, user_bir1 = user1
# Age and name for a location closer look at the results! ! !
user_age2, user_name2, user_bir2 = user2


print("name1:"+user_name1)
print("age1:" + str(user_age1))
print("bir1:"+user_bir1)
Print ( " ----------- ----------------- handsome parting line " )
print("name2:"+str(user_name2))
print("age2:"+user_age2)
print("bir2:"+user_bir2)
Print ( " John Doe's name and age position is reversed in order to explain this assignment ." )

run results:

20. Exception Handling

Error summary version:

# Exception exception run time errors detected as abnormal
# Error 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 / exception handling .py " , Line 19
#     print(str_hi)
#     ^
# IndentationError: unexpected indent
str_hi = "Hello SongKe2"
    print(str_hi)

Please enter # num: Songke
# Traceback (most recent call last):
File # " / Home / yangbin / Study / IdeaProjects / pythonWork / Day3 / exception handling .py " , Line 26 is , in <Module1> 
# NUM = int (INPUT ( " Please enter NUM: " ))
A ValueError #: invalid literal for  int () with Base  10 : ' Songke ' 
num1 = int (INPUT ( " Please enter num1: " ))
print(num1)

# Wrap the exception codes may appear
try:
    num2 = int (the INPUT ( " Please enter 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
    # Denominator can not be 0
    # A = 1 / 0

# 0 when the input string is not know when the input 0 transition causes abnormal or need to handle different situations caused
# Please enter num3: 0
# division by zero
# -------------------------------------------------
# Please enter num3: Songke
# invalid literal for int() with base 10: '松柯'
try:
    num3 = int (the INPUT ( " Please enter num3: " ))
    result = 1 / num3
    print(result)
    # ZeroDivisionError denominator is 0 iso
except ZeroDivisionError as error:
    print(error)
    # ValueError input error
except ValueError as error:
    print(error)


def test_fails(num4):
    return 1 / num4


try:
    Num4 = int (the INPUT ( " Please enter Num4: " ))
    result1 = test_fails(num4)
    print(result1)
    # ZeroDivisionError denominator is zero exception
except ZeroDivisionError as error:
    print(error)
    # ValueError input error
except ValueError as error:
    print(error)

Normal version:

# Exception exception run time errors detected as abnormal
# Error 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 / exception handling .py " , Line 19
#     print(str_hi)
#     ^
# IndentationError: unexpected indent
str_hi = "Hello SongKe2"
print(str_hi)

Please enter # num: Songke
# Traceback (most recent call last):
File # " / Home / yangbin / Study / IdeaProjects / pythonWork / Day3 / exception handling .py " , Line 26 is , in <Module1> 
# NUM = int (INPUT ( " Please enter NUM: " ))
A ValueError #: invalid literal for  int () with Base  10 : ' Songke ' 
num1 = int (INPUT ( " Please enter num1: " ))
print(num1)

# Wrap the exception codes may appear
try:
    num2 = int (the INPUT ( " Please enter 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
    # Denominator can not be 0
    # A = 1 / 0

# 0 when the input string is not know when the input 0 transition causes abnormal or need to handle different situations caused
# Please enter num3: 0
# division by zero
# -------------------------------------------------
# Please enter num3: Songke
# invalid literal for int() with base 10: '松柯'
try:
    num3 = int (the INPUT ( " Please enter num3: " ))
    result = 1 / num3
    print(result)
    # ZeroDivisionError denominator is 0 iso
except ZeroDivisionError as error:
    print(error)
    # ValueError input error
except ValueError as error:
    print(error)


def test_fails(num4):
    return 1 / num4


try:
    Num4 = int (the INPUT ( " Please enter Num4: " ))
    result1 = test_fails(num4)
    print(result1)
    # ZeroDivisionError denominator is zero exception
except ZeroDivisionError as error:
    print(error)
    # ValueError input error
except ValueError as error:
    print(error)

run results:

python based learning (IX)

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