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Method for adding error messages to a dictionary given a key

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Method for adding error messages to a dictionary given a key



The Next CEO of Stack Overflow“Multi-key” dictionaryOutputting all possible words which fit a string of lettersCheck value from two different dictionary with matched keyDictionary of key signatures for various major and minor scalesResolving MySQL 1215 errors in a declarative MySQL migration systemSmall Chatbot challengeSimple Python script seems to stop when N >> 1Make a given number by adding given numbersAdding values from DictReader to empty dictionaryDefine the scope of negation with the Dependency Parser of spaCy










3












$begingroup$


I want this method to be completely understandable just from looking at the code and comments only.



def add_error(error_dict, key, err):
"""Given an error message, or a list of error messages, this method
adds it/them to a dictionary of errors.

Doctests:
>>> add_error(, 'key1', 'error1')
'key1': ['error1']
>>> add_error('key1': ['error1'], 'key1', 'error2')
'key1': ['error1', 'error2']
>>> add_error('key1': ['error1', 'error2'], 'key2', 'error1')
'key1': ['error1', 'error2'], 'key2': ['error1']
>>> add_error(, 'key1', ['error1', 'error2'])
'key1': ['error1', 'error2']
>>> add_error(, 'key1', [])

>>> add_error('key1': ['error1'], 'key2', ['error1', 'error2'])
'key1': ['error1'], 'key2': ['error1', 'error2']
>>> add_error(, 'key1', 23) # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
TypeError: The error(s) must be a string, or a list of strings.
>>> add_error(, 'key1', [23]) # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
TypeError: The error(s) must be a string, or a list of strings.
>>> add_error(, 'key1', ['error1', 23]) # doctest:
+IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
TypeError: The error(s) must be a string, or a list of strings.
"""
if not isinstance(err, list):
err = [err]

if not key in error_dict and len(err) > 0:
error_dict[key] = []

for e in err:
if not isinstance(e, string_types):
raise TypeError(
'The error(s) must be a string, or a list of strings.'
)
error_dict[key].append(e)
return error_dict


Hopefully, the code along with the comment does the job well, but I would still appreciate review(s) of this method. One thing I always keep on wondering is whether this is too many doc-tests for such a simple method. Thanks.










share|improve this question







New contributor




darkhorse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$
















    3












    $begingroup$


    I want this method to be completely understandable just from looking at the code and comments only.



    def add_error(error_dict, key, err):
    """Given an error message, or a list of error messages, this method
    adds it/them to a dictionary of errors.

    Doctests:
    >>> add_error(, 'key1', 'error1')
    'key1': ['error1']
    >>> add_error('key1': ['error1'], 'key1', 'error2')
    'key1': ['error1', 'error2']
    >>> add_error('key1': ['error1', 'error2'], 'key2', 'error1')
    'key1': ['error1', 'error2'], 'key2': ['error1']
    >>> add_error(, 'key1', ['error1', 'error2'])
    'key1': ['error1', 'error2']
    >>> add_error(, 'key1', [])

    >>> add_error('key1': ['error1'], 'key2', ['error1', 'error2'])
    'key1': ['error1'], 'key2': ['error1', 'error2']
    >>> add_error(, 'key1', 23) # doctest: +IGNORE_EXCEPTION_DETAIL
    Traceback (most recent call last):
    ...
    TypeError: The error(s) must be a string, or a list of strings.
    >>> add_error(, 'key1', [23]) # doctest: +IGNORE_EXCEPTION_DETAIL
    Traceback (most recent call last):
    ...
    TypeError: The error(s) must be a string, or a list of strings.
    >>> add_error(, 'key1', ['error1', 23]) # doctest:
    +IGNORE_EXCEPTION_DETAIL
    Traceback (most recent call last):
    ...
    TypeError: The error(s) must be a string, or a list of strings.
    """
    if not isinstance(err, list):
    err = [err]

    if not key in error_dict and len(err) > 0:
    error_dict[key] = []

    for e in err:
    if not isinstance(e, string_types):
    raise TypeError(
    'The error(s) must be a string, or a list of strings.'
    )
    error_dict[key].append(e)
    return error_dict


    Hopefully, the code along with the comment does the job well, but I would still appreciate review(s) of this method. One thing I always keep on wondering is whether this is too many doc-tests for such a simple method. Thanks.










    share|improve this question







    New contributor




    darkhorse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.







    $endgroup$














      3












      3








      3





      $begingroup$


      I want this method to be completely understandable just from looking at the code and comments only.



      def add_error(error_dict, key, err):
      """Given an error message, or a list of error messages, this method
      adds it/them to a dictionary of errors.

      Doctests:
      >>> add_error(, 'key1', 'error1')
      'key1': ['error1']
      >>> add_error('key1': ['error1'], 'key1', 'error2')
      'key1': ['error1', 'error2']
      >>> add_error('key1': ['error1', 'error2'], 'key2', 'error1')
      'key1': ['error1', 'error2'], 'key2': ['error1']
      >>> add_error(, 'key1', ['error1', 'error2'])
      'key1': ['error1', 'error2']
      >>> add_error(, 'key1', [])

      >>> add_error('key1': ['error1'], 'key2', ['error1', 'error2'])
      'key1': ['error1'], 'key2': ['error1', 'error2']
      >>> add_error(, 'key1', 23) # doctest: +IGNORE_EXCEPTION_DETAIL
      Traceback (most recent call last):
      ...
      TypeError: The error(s) must be a string, or a list of strings.
      >>> add_error(, 'key1', [23]) # doctest: +IGNORE_EXCEPTION_DETAIL
      Traceback (most recent call last):
      ...
      TypeError: The error(s) must be a string, or a list of strings.
      >>> add_error(, 'key1', ['error1', 23]) # doctest:
      +IGNORE_EXCEPTION_DETAIL
      Traceback (most recent call last):
      ...
      TypeError: The error(s) must be a string, or a list of strings.
      """
      if not isinstance(err, list):
      err = [err]

      if not key in error_dict and len(err) > 0:
      error_dict[key] = []

      for e in err:
      if not isinstance(e, string_types):
      raise TypeError(
      'The error(s) must be a string, or a list of strings.'
      )
      error_dict[key].append(e)
      return error_dict


      Hopefully, the code along with the comment does the job well, but I would still appreciate review(s) of this method. One thing I always keep on wondering is whether this is too many doc-tests for such a simple method. Thanks.










      share|improve this question







      New contributor




      darkhorse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.







      $endgroup$




      I want this method to be completely understandable just from looking at the code and comments only.



      def add_error(error_dict, key, err):
      """Given an error message, or a list of error messages, this method
      adds it/them to a dictionary of errors.

      Doctests:
      >>> add_error(, 'key1', 'error1')
      'key1': ['error1']
      >>> add_error('key1': ['error1'], 'key1', 'error2')
      'key1': ['error1', 'error2']
      >>> add_error('key1': ['error1', 'error2'], 'key2', 'error1')
      'key1': ['error1', 'error2'], 'key2': ['error1']
      >>> add_error(, 'key1', ['error1', 'error2'])
      'key1': ['error1', 'error2']
      >>> add_error(, 'key1', [])

      >>> add_error('key1': ['error1'], 'key2', ['error1', 'error2'])
      'key1': ['error1'], 'key2': ['error1', 'error2']
      >>> add_error(, 'key1', 23) # doctest: +IGNORE_EXCEPTION_DETAIL
      Traceback (most recent call last):
      ...
      TypeError: The error(s) must be a string, or a list of strings.
      >>> add_error(, 'key1', [23]) # doctest: +IGNORE_EXCEPTION_DETAIL
      Traceback (most recent call last):
      ...
      TypeError: The error(s) must be a string, or a list of strings.
      >>> add_error(, 'key1', ['error1', 23]) # doctest:
      +IGNORE_EXCEPTION_DETAIL
      Traceback (most recent call last):
      ...
      TypeError: The error(s) must be a string, or a list of strings.
      """
      if not isinstance(err, list):
      err = [err]

      if not key in error_dict and len(err) > 0:
      error_dict[key] = []

      for e in err:
      if not isinstance(e, string_types):
      raise TypeError(
      'The error(s) must be a string, or a list of strings.'
      )
      error_dict[key].append(e)
      return error_dict


      Hopefully, the code along with the comment does the job well, but I would still appreciate review(s) of this method. One thing I always keep on wondering is whether this is too many doc-tests for such a simple method. Thanks.







      python python-3.x






      share|improve this question







      New contributor




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      share|improve this question







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      darkhorse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question






      New contributor




      darkhorse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      asked 3 hours ago









      darkhorsedarkhorse

      1534




      1534




      New contributor




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      New contributor





      darkhorse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      darkhorse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.




















          2 Answers
          2






          active

          oldest

          votes


















          2












          $begingroup$

          Consider narrowing accepted types



          This might not be possible based on the context of your code, but if it is: arguments sharing one of many different types hinders and complicates testability and maintainability. There are many different solutions to this that will help this situation; one is accepting variadic arguments - i.e.



          def add_error(error_dict, key, *errs):


          This is still easily invocable without needing to wrap a single error in a list.



          Use x not in instead of not x in



          i.e.



          if key not in error_dict


          Lose your loop



          and also lose your empty-list assignment, instead doing



          error_dict.setdefault(key, []).extend(err)


          If you use the variadic suggestion above, your entire function becomes that one line.



          Immutable or not?



          Currently you do two things - alter a dictionary and return it - when you should only pick one. Either make a copy of the dict and return an altered version, or modify the dict and don't return anything.






          share|improve this answer









          $endgroup$




















            1












            $begingroup$

            congratulations on writing a fairly clear, readable function! (And welcome!)



            What types do you take?



            You explicitly check for an instance of type list. I think you should invert your check, and look for a string type instead. The reason is that it would enable you to accept iterables other than list as your errors.



            For example, you would be able to do something like:



            add_error(edict, 'key', (str(e) for e in ...))


            That last parameter is not a list, but it is something you might want to do. Also, *args is not a list but a tuple - you might want to splat a tuple rather than converting it to a list first.



            What types do you take?



            Your key parameter is always tested as a string. But dicts can have other key-types than string, and you neither test those, nor do you appear to have coded any kind of rejection on that basis. I suggest you add some tests that demonstrate your intent: is it okay to use non-strings as keys, or not?



            What constraints exist on the errors?



            I don't see any indication of what happens when duplicate errors are added. Is this intended to be allowed, or not?



            What constraints exist on the keys?



            Is it okay to use None as a key? How about '' (empty string)? Tests, please.






            share|improve this answer









            $endgroup$













              Your Answer





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              2 Answers
              2






              active

              oldest

              votes








              2 Answers
              2






              active

              oldest

              votes









              active

              oldest

              votes






              active

              oldest

              votes









              2












              $begingroup$

              Consider narrowing accepted types



              This might not be possible based on the context of your code, but if it is: arguments sharing one of many different types hinders and complicates testability and maintainability. There are many different solutions to this that will help this situation; one is accepting variadic arguments - i.e.



              def add_error(error_dict, key, *errs):


              This is still easily invocable without needing to wrap a single error in a list.



              Use x not in instead of not x in



              i.e.



              if key not in error_dict


              Lose your loop



              and also lose your empty-list assignment, instead doing



              error_dict.setdefault(key, []).extend(err)


              If you use the variadic suggestion above, your entire function becomes that one line.



              Immutable or not?



              Currently you do two things - alter a dictionary and return it - when you should only pick one. Either make a copy of the dict and return an altered version, or modify the dict and don't return anything.






              share|improve this answer









              $endgroup$

















                2












                $begingroup$

                Consider narrowing accepted types



                This might not be possible based on the context of your code, but if it is: arguments sharing one of many different types hinders and complicates testability and maintainability. There are many different solutions to this that will help this situation; one is accepting variadic arguments - i.e.



                def add_error(error_dict, key, *errs):


                This is still easily invocable without needing to wrap a single error in a list.



                Use x not in instead of not x in



                i.e.



                if key not in error_dict


                Lose your loop



                and also lose your empty-list assignment, instead doing



                error_dict.setdefault(key, []).extend(err)


                If you use the variadic suggestion above, your entire function becomes that one line.



                Immutable or not?



                Currently you do two things - alter a dictionary and return it - when you should only pick one. Either make a copy of the dict and return an altered version, or modify the dict and don't return anything.






                share|improve this answer









                $endgroup$















                  2












                  2








                  2





                  $begingroup$

                  Consider narrowing accepted types



                  This might not be possible based on the context of your code, but if it is: arguments sharing one of many different types hinders and complicates testability and maintainability. There are many different solutions to this that will help this situation; one is accepting variadic arguments - i.e.



                  def add_error(error_dict, key, *errs):


                  This is still easily invocable without needing to wrap a single error in a list.



                  Use x not in instead of not x in



                  i.e.



                  if key not in error_dict


                  Lose your loop



                  and also lose your empty-list assignment, instead doing



                  error_dict.setdefault(key, []).extend(err)


                  If you use the variadic suggestion above, your entire function becomes that one line.



                  Immutable or not?



                  Currently you do two things - alter a dictionary and return it - when you should only pick one. Either make a copy of the dict and return an altered version, or modify the dict and don't return anything.






                  share|improve this answer









                  $endgroup$



                  Consider narrowing accepted types



                  This might not be possible based on the context of your code, but if it is: arguments sharing one of many different types hinders and complicates testability and maintainability. There are many different solutions to this that will help this situation; one is accepting variadic arguments - i.e.



                  def add_error(error_dict, key, *errs):


                  This is still easily invocable without needing to wrap a single error in a list.



                  Use x not in instead of not x in



                  i.e.



                  if key not in error_dict


                  Lose your loop



                  and also lose your empty-list assignment, instead doing



                  error_dict.setdefault(key, []).extend(err)


                  If you use the variadic suggestion above, your entire function becomes that one line.



                  Immutable or not?



                  Currently you do two things - alter a dictionary and return it - when you should only pick one. Either make a copy of the dict and return an altered version, or modify the dict and don't return anything.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 1 hour ago









                  ReinderienReinderien

                  4,965925




                  4,965925























                      1












                      $begingroup$

                      congratulations on writing a fairly clear, readable function! (And welcome!)



                      What types do you take?



                      You explicitly check for an instance of type list. I think you should invert your check, and look for a string type instead. The reason is that it would enable you to accept iterables other than list as your errors.



                      For example, you would be able to do something like:



                      add_error(edict, 'key', (str(e) for e in ...))


                      That last parameter is not a list, but it is something you might want to do. Also, *args is not a list but a tuple - you might want to splat a tuple rather than converting it to a list first.



                      What types do you take?



                      Your key parameter is always tested as a string. But dicts can have other key-types than string, and you neither test those, nor do you appear to have coded any kind of rejection on that basis. I suggest you add some tests that demonstrate your intent: is it okay to use non-strings as keys, or not?



                      What constraints exist on the errors?



                      I don't see any indication of what happens when duplicate errors are added. Is this intended to be allowed, or not?



                      What constraints exist on the keys?



                      Is it okay to use None as a key? How about '' (empty string)? Tests, please.






                      share|improve this answer









                      $endgroup$

















                        1












                        $begingroup$

                        congratulations on writing a fairly clear, readable function! (And welcome!)



                        What types do you take?



                        You explicitly check for an instance of type list. I think you should invert your check, and look for a string type instead. The reason is that it would enable you to accept iterables other than list as your errors.



                        For example, you would be able to do something like:



                        add_error(edict, 'key', (str(e) for e in ...))


                        That last parameter is not a list, but it is something you might want to do. Also, *args is not a list but a tuple - you might want to splat a tuple rather than converting it to a list first.



                        What types do you take?



                        Your key parameter is always tested as a string. But dicts can have other key-types than string, and you neither test those, nor do you appear to have coded any kind of rejection on that basis. I suggest you add some tests that demonstrate your intent: is it okay to use non-strings as keys, or not?



                        What constraints exist on the errors?



                        I don't see any indication of what happens when duplicate errors are added. Is this intended to be allowed, or not?



                        What constraints exist on the keys?



                        Is it okay to use None as a key? How about '' (empty string)? Tests, please.






                        share|improve this answer









                        $endgroup$















                          1












                          1








                          1





                          $begingroup$

                          congratulations on writing a fairly clear, readable function! (And welcome!)



                          What types do you take?



                          You explicitly check for an instance of type list. I think you should invert your check, and look for a string type instead. The reason is that it would enable you to accept iterables other than list as your errors.



                          For example, you would be able to do something like:



                          add_error(edict, 'key', (str(e) for e in ...))


                          That last parameter is not a list, but it is something you might want to do. Also, *args is not a list but a tuple - you might want to splat a tuple rather than converting it to a list first.



                          What types do you take?



                          Your key parameter is always tested as a string. But dicts can have other key-types than string, and you neither test those, nor do you appear to have coded any kind of rejection on that basis. I suggest you add some tests that demonstrate your intent: is it okay to use non-strings as keys, or not?



                          What constraints exist on the errors?



                          I don't see any indication of what happens when duplicate errors are added. Is this intended to be allowed, or not?



                          What constraints exist on the keys?



                          Is it okay to use None as a key? How about '' (empty string)? Tests, please.






                          share|improve this answer









                          $endgroup$



                          congratulations on writing a fairly clear, readable function! (And welcome!)



                          What types do you take?



                          You explicitly check for an instance of type list. I think you should invert your check, and look for a string type instead. The reason is that it would enable you to accept iterables other than list as your errors.



                          For example, you would be able to do something like:



                          add_error(edict, 'key', (str(e) for e in ...))


                          That last parameter is not a list, but it is something you might want to do. Also, *args is not a list but a tuple - you might want to splat a tuple rather than converting it to a list first.



                          What types do you take?



                          Your key parameter is always tested as a string. But dicts can have other key-types than string, and you neither test those, nor do you appear to have coded any kind of rejection on that basis. I suggest you add some tests that demonstrate your intent: is it okay to use non-strings as keys, or not?



                          What constraints exist on the errors?



                          I don't see any indication of what happens when duplicate errors are added. Is this intended to be allowed, or not?



                          What constraints exist on the keys?



                          Is it okay to use None as a key? How about '' (empty string)? Tests, please.







                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered 11 mins ago









                          Austin HastingsAustin Hastings

                          7,5571233




                          7,5571233




















                              darkhorse is a new contributor. Be nice, and check out our Code of Conduct.









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                              darkhorse is a new contributor. Be nice, and check out our Code of Conduct.












                              darkhorse is a new contributor. Be nice, and check out our Code of Conduct.











                              darkhorse is a new contributor. Be nice, and check out our Code of Conduct.














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