Question

I'm new to Python. How how can I append a counter to a variable?
ctr = 3
variable = variable3

Answer 1

What are you trying to do? I don't quite understand the question.
If you are trying to add 3 to any variable you can just use
variable +=3

So,
>>> ctr = 0
>>> ctr += 3
>>> ctr += 3
>>> print ctr
6

Answer 2

variable = []
variable.append(ctr) ??????

Answer 3

when you tried it did you get something like this in the traceback?: TypeError: cannot concatenate 'str' and 'int' objects

maybe this: v = "variable" + str(ctr)

Answer 4

If I'm understanding the question correctly, you are trying to programmatically create a variable name using information stored in another variable. While it is possible (with some magic) it's not recommended. Instead I would suggest storing the information into a dictionary or, if you are accessing sequential data, a list.

e.g.
variable = []
variable.append('ham')
variable.append('eggs')
variable.append('toast')
print "For breakfast I'd like %s, %s and no %s" % (variable[1], variable[2], variable[0])

Answer 5

You can't.

You just increment the value assigned to a variable

ctr = ctr + 1

or

ctr += 1

for short. You can assign the value of a variable to another.

a = 5
ctr += a

That's about it. The append method is for lists, for adding an object on to the end of an existing sequence of objects.