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python - 在函数中引发 ValueError

问题描述

我已经编写了这段代码，当我提交给我的 MOOC 时，它会产生一个错误，但在我的终端中一切正常吗？

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)

标签： pythonexception-handlingvalueerror

解决方案

您似乎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”下。

    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

此外，我创建了另一个版本的代码，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！

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