Python list indices must be integers not tuple

Question

I have been banging my head against this for two days now  I am new to python and programming so the other examples of this type of error have not helped me to much  I am reading through the documentation for lists and tuples  but haven t found anything that helps  Any pointer would be much appreciated  Not looking for the answer necessarily  just more resources on where to look  I am using Python 2 7 6  Thanks  measure   raw input  How would you like to measure the coins  Enter 1 for grams 2 for pounds       coin args       pennies    2 5    50 0     01      nickles    5 0    40 0     05     dimes    2 268    50 0     1     quarters    5 67    40 0     25      if measure    2      for coin  coin weight  rolls  worth in coin args          print  Enter the weight of your  s     coin          weight   float raw input            convert2grams   weight   453 592          num coin   convert2grams    float coin weight           num roll   round num coin    float rolls            amount   round num coin    float worth    2           print  You have  d  s  worth    d  and will need  d rolls      num coin  coin  amount  num roll   else      for coin  coin weight  rolls  worth in coin args          print  Enter the weight of your  s     coin          weight   float raw input             num coin   weight    float coin weight           num roll   round num coin    float rolls            amount   round num coin    float worth    2           print  You have  d  s  worth    d  and will need  d rolls      num coin  coin  amount  num roll    This is the stack trace   File    coin estimator by weight py   line 5  in  lt module gt      nickles    5 0    40 0     05   TypeError  list indices must be integers  not tuple

User · Answer

To create list of lists  you need to separate them with commas  like this  coin args           pennies    2 5    50 0     01          nickles    5 0    40 0     05          dimes    2 268    50 0     1          quarters    5 67    40 0     25

User · Answer

The problem is that       in python has two distinct meanings   expr   index   means accessing an element of a list   expr1  expr2  expr3   means building a list of three elements from three expressions   In your code you forgot the comma between the expressions for the items in the outer list      a  b  c   d  e  f   g  h  i      therefore Python interpreted the start of second element as an index to be applied to the first and this is what the error message is saying   The correct syntax for what you re looking for is     a  b  c    d  e  f    g  h  i

User · Answer

Why does the error mention tuples   Others have explained that the problem was the missing    but the final mystery is why does the error message talk about tuples   The reason is that your     pennies    2 5    50 0     01      nickles    5 0    40 0     05     can be reduced to      1  2    as mentioned by 6502 with the same error   But then   getitem    which deals with    resolution  converts object 1  2  to a tuple   class C object       def   getitem   self  k           return k    Single argument is passed directly  assert C   0     0    Multiple indices generate a tuple  assert C   0  1      0  1    and the implementation of   getitem   for the list built-in class cannot deal with tuple arguments like that   More examples of   getitem   action at  https   stackoverflow com a 33086813 895245

[python] Python 'list indices must be integers, not tuple"

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