I've been searching for quite a while, and I can't seem to find the answer to this. I want to know if you can use variables when using the range() function. For example, I can't get this to work:
l=raw_input('Enter Length.')
#Let's say I enter 9.
l=9
for i in range (0,l):
#Do something (like append to a list)
Python tells me I cannot use variables when using the range function. Can anybody help me?
Since the user inputs is a string and you need integer values to define the range, you can typecast the input to be a integer value using int method.
>> l=int(raw_input('Enter Length: ')) # python 3: int(input('Enter Length: '))
>> for i in range (0,l):
>> #Do something (like append to a list)
for i in range (l) is shorter and does the same thingYou ask user to input a number
l = raw_input('Enter Length: ')
But the problem is that entered number will be presented as a string instead of int. So you have to convert string 2 int
l = int(raw_input('Enter Length: '))
If you use Python 2.X you also can optimize your code - instead of range you might use xrange. It works much faster.
for i in xrange (l):
#Do something (like append to a list)
In Python 3.X xrange was implemented by default
Try this code:
x = int(input("the number you want"))
for i in range(x):
raw_input, it is a string. Cast it to anint.int(raw_input('Enter Length.')), so the exact term is not "Cast", but "Convert it to an integer", or "Construct an integer out of it".