在函数中引发ValueError

Question

我写了这段代码，当我提交给我的MOOC时，它会产生错误，但我的终端一切都很好吗？

def suggest(product_idea):
    return product_idea + "inator"

try:
    product_idea = input("What is your product idea? ")
    if len(product_idea) <= 3: #to catch the exception of people trying to use LESS THAN 3 characters
        raise ValueError("Your product Idea is too short. Please re-submit with more than 3 characters.") #raise is used here to capture the error
except ValueError as err: #this is to handle the error from line 8
        print("Oh no! That's not a valid value. Try again...")
        print("({})".format(err)) #this is to handle the error from line 8
else:
        print("Great idea!")

这是我从MOOC（树屋）得到的错误：

Bummer: Oh no, there were 2 problems with your code, check the preview pane for more information
.
----------------------------------------------------------------------
Ran 1 test in 0.000s

OK
EE
======================================================================
ERROR: test_exception_not_raised (__main__.TestRaiseExecution)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "", line 23, in test_exception_not_raised
  File "/workdir/utils/challenge.py", line 20, in execute_source
    exec(src)
  File "", line 5, in 
EOFError: EOF when reading a line

======================================================================
ERROR: test_exception_raised (__main__.TestRaiseExecution)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "", line 30, in test_exception_raised
  File "/workdir/utils/challenge.py", line 20, in execute_source
    exec(src)
  File "", line 5, in 
EOFError: EOF when reading a line

----------------------------------------------------------------------
Ran 2 tests in 0.002s

FAILED (errors=2)

Answer 1

看来你已经在错误的代码块下插入了'if else'语句的'else'部分。它属于Try块中的'Try'。

    def suggest(product_idea):
        return product_idea + "inator"

    try:
        product_idea = input("What is your product idea? ")
        if len(product_idea) <= 3: #to catch the exception of people trying to use LESS THAN 3 characters
            raise ValueError("Your product Idea is too short. Please re-submit with more than 3 characters.") #raise is used here to capture the error
        else:
            print("Great idea!")

    except ValueError as err: #this is to handle the error from line 8
            print("Oh no! That's not a valid value. Try again...")
    print("({})".format(err)) #this is to handle the error from line 8

另外，我创建了另一个版本的代码，其中您创建的函数suggest（）在Try块中被调用。

    def suggest(product_idea):
        print(product_idea + "inator")

    try:
        product_idea = input("What is your product idea? ")
        if len(product_idea) <= 3: #to catch the exception of people trying to use LESS THAN 3 characters
            raise ValueError("Your product Idea is too short. Please re-submit with more than 3 characters.") #raise is used here to capture the error
        else:
            suggest(product_idea)
            print("Great idea!")

    except ValueError as err: #this is to handle the error from line 8
            print("Oh no! That's not a valid value. Try again...")
    print("({})".format(err)) #this is to handle the error from line 8

希望这可以帮助！

Answer 2

使用raw_input("What is your product idea? ")而不是input("What is your product idea? ")