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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 <module> ["nickles", '5.0', '40.0', '.05'] TypeError: list indices must be integers, not tuple 
921
The Python "TypeError: list indices must be integers or slices, not tuple" occurs when we pass a tuple between the square brackets when accessing a list at index. To solve the error, make sure to separate nested list elements with commas and correct the index accessor.
The Python "TypeError: tuple indices must be integers or slices, not tuple" occurs when we use a tuple instead of an integer when accessing a tuple at index. To solve the error, correct the assignment or use a colon if trying to get a slice of a tuple.
The Python "TypeError: list indices must be integers or slices, not str" occurs when we use a string instead of an integer to access a list at a specific index. To solve the error, use the int() class to convert the string to an integer, e.g. my_list[int(my_str)] .
The Python "TypeError: list indices must be integers or slices, not float" occurs when we use a floating-point number to access a list at a specific index. To solve the error, convert the float to an integer, e.g. my_list[int(my_float)] .
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 expressionsIn 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] ] 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'] ] If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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