I just want to divide each element in a list by an int.
myList = [10,20,30,40,50,60,70,80,90] myInt = 10 newList = myList/myInt
This is the error:
TypeError: unsupported operand type(s) for /: 'list' and 'int'
I understand why I am receiving this error. But I am frustrated that I can't find a solution.
newList = [ a/b for a, b in (myList,myInt)]
ValueError: too many values to unpack
newList = [1,2,3,4,5,6,7,8,9]
The following code gives me my expected result:
newList =  for x in myList: newList.append(x/myInt)
But is there an easier/faster way to do this?
The idiomatic way would be to use list comprehension:
myList = [10,20,30,40,50,60,70,80,90] myInt = 10 newList = [x / myInt for x in myList]
or, if you need to maintain the reference to the original list:
myList[:] = [x / myInt for x in myList]
The way you tried first is actually directly possible with numpy:
import numpy myArray = numpy.array([10,20,30,40,50,60,70,80,90]) myInt = 10 newArray = myArray/myInt
If you do such operations with long lists and especially in any sort of scientific computing project, I would really advise using numpy.