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Different ValueError for the same operation in List and Tuple

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2

I am curious why ValueErrors are different in List and Tuple when I try to get an index. ValueError of a list returns in well format with actual argument "ValueError: 'ITEM' is not in list", whereas tuple returns something like this "ValueError: tuple.index(x): x not in tuple".
I think List and Tuple both are calling same index() method then why it is raising different ValueErrors?

>>> jframe_li
['Angular', 'React', 'Vue.js', 'Ember.js', 'Mereor', 'Node.js', 'Backbone.js']
>>> jframe_tu
('Angular', 'React', 'Vue.js', 'Ember.js', 'Mereor', 'Node.js', 'Backbone.js')
>>> jframe_li.index('React')
1
>>> jframe_tu.index('React')
1
>>> jframe_li.index('react')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: 'react' is not in list

>>> jframe_tu.index('react')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: tuple.index(x): x not in tuple

python python-3.x list tuples

share|improve this question

edited Mar 26 at 17:18

Aran-Fey

20.3k55 gold badges4343 silver badges8282 bronze badges

asked Mar 26 at 17:18

Hardik PatelHardik Patel

3366 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "I think List and Tuple both are calling same index() method" - I'm not sure this is a valid assumption.
  
  – snakecharmerb
  Mar 26 at 17:34
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @snakecharmerb According to docs, Tuples implement all of the common sequence operations which include .index, now would you say it implements it in a different way?
  
  – Samuel
  Mar 26 at 17:43
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Samuel as the answer below demonstrates, I would say that they are implemented differently.
  
  – snakecharmerb
  Mar 26 at 19:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yeah, you were right, I also learned in the process.
  
  – Samuel
  Mar 26 at 20:00
  
  

  
  
  
  

add a comment | 

2

I am curious why ValueErrors are different in List and Tuple when I try to get an index. ValueError of a list returns in well format with actual argument "ValueError: 'ITEM' is not in list", whereas tuple returns something like this "ValueError: tuple.index(x): x not in tuple".
I think List and Tuple both are calling same index() method then why it is raising different ValueErrors?

>>> jframe_li
['Angular', 'React', 'Vue.js', 'Ember.js', 'Mereor', 'Node.js', 'Backbone.js']
>>> jframe_tu
('Angular', 'React', 'Vue.js', 'Ember.js', 'Mereor', 'Node.js', 'Backbone.js')
>>> jframe_li.index('React')
1
>>> jframe_tu.index('React')
1
>>> jframe_li.index('react')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: 'react' is not in list

>>> jframe_tu.index('react')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: tuple.index(x): x not in tuple

python python-3.x list tuples

share|improve this question

edited Mar 26 at 17:18

Aran-Fey

20.3k55 gold badges4343 silver badges8282 bronze badges

asked Mar 26 at 17:18

Hardik PatelHardik Patel

3366 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "I think List and Tuple both are calling same index() method" - I'm not sure this is a valid assumption.
  
  – snakecharmerb
  Mar 26 at 17:34
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @snakecharmerb According to docs, Tuples implement all of the common sequence operations which include .index, now would you say it implements it in a different way?
  
  – Samuel
  Mar 26 at 17:43
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Samuel as the answer below demonstrates, I would say that they are implemented differently.
  
  – snakecharmerb
  Mar 26 at 19:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yeah, you were right, I also learned in the process.
  
  – Samuel
  Mar 26 at 20:00
  
  

  
  
  
  

add a comment | 

I am curious why ValueErrors are different in List and Tuple when I try to get an index. ValueError of a list returns in well format with actual argument "ValueError: 'ITEM' is not in list", whereas tuple returns something like this "ValueError: tuple.index(x): x not in tuple".
I think List and Tuple both are calling same index() method then why it is raising different ValueErrors?

>>> jframe_li
['Angular', 'React', 'Vue.js', 'Ember.js', 'Mereor', 'Node.js', 'Backbone.js']
>>> jframe_tu
('Angular', 'React', 'Vue.js', 'Ember.js', 'Mereor', 'Node.js', 'Backbone.js')
>>> jframe_li.index('React')
1
>>> jframe_tu.index('React')
1
>>> jframe_li.index('react')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: 'react' is not in list

>>> jframe_tu.index('react')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: tuple.index(x): x not in tuple

python python-3.x list tuples

share|improve this question

edited Mar 26 at 17:18

Aran-Fey

20.3k55 gold badges4343 silver badges8282 bronze badges

asked Mar 26 at 17:18

Hardik PatelHardik Patel

3366 bronze badges

>>> jframe_li
['Angular', 'React', 'Vue.js', 'Ember.js', 'Mereor', 'Node.js', 'Backbone.js']
>>> jframe_tu
('Angular', 'React', 'Vue.js', 'Ember.js', 'Mereor', 'Node.js', 'Backbone.js')
>>> jframe_li.index('React')
1
>>> jframe_tu.index('React')
1
>>> jframe_li.index('react')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: 'react' is not in list

>>> jframe_tu.index('react')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: tuple.index(x): x not in tuple

share|improve this question

edited Mar 26 at 17:18

Aran-Fey

20.3k55 gold badges4343 silver badges8282 bronze badges

asked Mar 26 at 17:18

Hardik PatelHardik Patel

3366 bronze badges

share|improve this question

edited Mar 26 at 17:18

Aran-Fey

20.3k55 gold badges4343 silver badges8282 bronze badges

asked Mar 26 at 17:18

Hardik PatelHardik Patel

3366 bronze badges

edited Mar 26 at 17:18

Aran-Fey

20.3k55 gold badges4343 silver badges8282 bronze badges

edited Mar 26 at 17:18

Aran-Fey

20.3k55 gold badges4343 silver badges8282 bronze badges

asked Mar 26 at 17:18

Hardik PatelHardik Patel

3366 bronze badges

asked Mar 26 at 17:18

Hardik PatelHardik Patel

3366 bronze badges

1 Answer
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4

There are implementation differences in the index methods for lists and tuples, including in the text of a raised ValueError.

See ValueError string for tuple.index and ValueError string for list.index

share|improve this answer

answered Mar 26 at 18:50

benvcbenvc

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4

There are implementation differences in the index methods for lists and tuples, including in the text of a raised ValueError.

See ValueError string for tuple.index and ValueError string for list.index

share|improve this answer

answered Mar 26 at 18:50

benvcbenvc

8,30411 gold badge1313 silver badges3030 bronze badges

add a comment | 

4

There are implementation differences in the index methods for lists and tuples, including in the text of a raised ValueError.

See ValueError string for tuple.index and ValueError string for list.index

share|improve this answer

answered Mar 26 at 18:50

benvcbenvc

8,30411 gold badge1313 silver badges3030 bronze badges

add a comment | 

There are implementation differences in the index methods for lists and tuples, including in the text of a raised ValueError.

See ValueError string for tuple.index and ValueError string for list.index

share|improve this answer

answered Mar 26 at 18:50

benvcbenvc

8,30411 gold badge1313 silver badges3030 bronze badges

share|improve this answer

answered Mar 26 at 18:50

benvcbenvc

8,30411 gold badge1313 silver badges3030 bronze badges

answered Mar 26 at 18:50

benvcbenvc

8,30411 gold badge1313 silver badges3030 bronze badges

answered Mar 26 at 18:50

benvcbenvc

8,30411 gold badge1313 silver badges3030 bronze badges