Need help with "unsupported operand type(s)"

[_dave]

I am starting to learn python and I cannot figure out the following error "unsupported operand type(s) for -: 'str' and 'int'". Remember, I really don't know what I am to do here. Below is my code and error. Thanks ahead for any help in understanding what I don't know.

PUT CODE HERE

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# list of names --- ListOfNames = ["tom" , "bill" , "dick", "harry"] print(ListOfNames)   # remove one name --- RemoveNameNumber = input ("Enter the number of the name to remove: ") print ("Verify number selected is " + str(RemoveNameNumber))   # name to be removed --- NameRemoved = ListOfNames[RemoveNameNumber -1] print("Name removed will be " + NameRemoved)

error:

Error:
11 # name to be removed ---
---> 12 NameRemoved = ListOfNames[RemoveNameNumber -1]
     13 print("Name removed will be " + NameRemoved)
     14 

TypeError: unsupported operand type(s) for -: 'str' and 'int'

One more thing, if this is not the right way to post, please advise. Thanks

[Yoriz]

input returns a string, there is no need to use str on the string in the line

1	print ("Verify number selected is " + str(RemoveNameNumber))

instead use int on the returned string in the following line

1	NameRemoved = ListOfNames[RemoveNameNumber -1]

[DZ_Galaxy]

Hello
1- Line 7: The return type the input() function is a string so adding the str on the RemoveNameNumber variable is useless.

2- Line 10: The variable RemoveNameNumber has a string value because of the inpute() function, so you are trying to calculate a string to the number -1 (string - integer) which is an error;
- it has to be an integer to an integer, so you need to add the int to the RemoveNameNumber like this int(RemoveNameNumber).

hope this help

[_dave]

I still am not getting the str / int down pat. I still get the same error below and I have tried both str and int and it still fails - here my new code and error.

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# LEARNING ABOUT "LIST"   # list of names --- ListOfNames = ["tom" , "bill" , "dick", "harry"] print(ListOfNames) print("")   #add a space for next line   # what is the total numbers in the list --- TotalNumberInList = str(len(ListOfNames)) print ("Total number of names are: " + str(TotalNumberInList))   # keep number in range --- print ("numbers to use must be between 0 and " + str(TotalNumberInList)) print("")   #add a space for next line   # remove one name --- RemoveNameNumber = input ("Enter the number of the name to remove: ") print("")   #add a space for next line   # name that will be removed ---   print ("Person being removed is " + ListOfNames[RemoveNameNumber -1])   # remove name from listing and print new listing --- del ListOfNames[int(RemoveNameNumber [-1])] print ("New List of Names are: " + str(ListOfNames))

and my error code -

20 # name that will be removed ---
21
---> 22 print ("Person being removed is " + ListOfNames[RemoveNameNumber -1])
23
24
TypeError: unsupported operand type(s) for -: 'str' and 'int'

Again, thanks for all the help, I'll learn this yet. And this is a very good learning sample for me.

[buran]

input will return str.
You need to convert RemoveNameNumber to int in order to calculate index RemoveNameNumber - 1

[_dave]

Finally got it - a big thanks for all the help, 1 down and 999999999999 to go

final code:

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# LEARNING ABOUT "LIST"   # list of names --- ListOfNames = ["tom" , "bill" , "dick", "harry"] print(ListOfNames) print("")   #add a space for next line   # what is the total numbers in the list --- TotalNumberInList = str(len(ListOfNames)) print ("Total number of names are: " + str(TotalNumberInList))   # keep number in range --- print ("numbers to use must be between 1 and " + str(TotalNumberInList)) print("")   #add a space for next line   # remove one name --- RemoveNameNumber = int(input ("Enter the number of the name to remove: ")) print("")   #add a space for next line   # name that will be removed ---   NameRemoved = ListOfNames[RemoveNameNumber -1] print ("Person being removed is " + NameRemoved) print("")   #add a space for next line   # remove name from listing and print new listing --- del ListOfNames[RemoveNameNumber -1] print ("New List of Names are: " + str(ListOfNames))

[buran]

I bit of advise - use string formatting instead of string concatenation. This will save you all the hassle to convert numbers to string