How do I convert a list of integers to ints?

It looks like your variable that is a string. This is why you can't compare it against an integer. If you need to convert your string to an int you can simply wrap it with int(your_variable_here).

For example

if int(that) < var:

This would convert the string that to an integers (number). The benefits of converting it to a integer is that you can compare it against other integers, and use basic arithmetic operations. That wouldn't be possible if you used a string.

An even better solution would be to directly store the input as an integer.

List1.append(int(thing)) # We wrap the keyboard input with int 

Also, if you are running Python 2.x I would recommend that you use raw_input, instead of input.

Since this doesn't seem to be in any loop, I don't see how you can have more than one entry in the list.. Perhaps you could have space seperated numbers entered? Using python 3, this could be minimized like so (minus error handling):

nums = [x for x in list(map(int, input("Enter numbers: ").split())) if x < 300] nums.sort() 

Or..

nums = input("Enter numbers: ") # Get the number string nums = nums.split() # Split the string by space character nums = list(map(int, nums)) # call int() on each item in the list, converting to int nums.sort() # sort the list of numbers nums = [x for x in nums if x < 300] # remove any numbers 300 or over. 

Input/output:

Enter numbers: 1 5 301 3000 2 [1, 2, 5] 

If you enter the numbers separated by commas, the following single line will work:

>>> sorted(list(input("Enter numbers: ")), reverse=True) Enter numbers: 1, 2, 3 [3, 2, 1] 

To remove numbers < 300:

>>> sorted([num for num in input("Enter numbers: ") if num < 300], reverse=True) Enter numbers: 1, 301, 299, 300, 2, 3 [299, 3, 2, 1]