I would like to insert the value of a variable into the name of another variable in python. In a shell script this would be something like:
for n in `more list`
do
var_$n = some_calculation
done
but I can't see how to do a similar thing in python. Is there a way or should I be using an alternative approach?
thanks,
Andy
Don't do it! Having variable names that change depending on the value of a variable leads to unnecessary complications. A cleaner way is to use a dictionary:
vr={}
for n in alist:
vr[n]=some_calculation()
try: class.${TYPE}... i know that this comes from php but it's saves so many nerves..for n in more_list:
globals()["var_"+str(n)]=some_calculation
setattr(self, key, value) or self.__setattr__(key, value). See Python documentation for detailsMaybe not perfect, but two possible solutions:
>>> name = "var_1" >>> locals()[name] = 5 >>> print var_1 5 >>> exec(name + "= 6") >>> print var_1 6
locals() approach does not work inside functions. See here: forums.devshed.com/python-programming-11/… It is still valid, I tested it.Basically it is not prefer to have variable like var1 = foo var2 = bar var${id} is actually a group of variable with similar characteristics that's why you would like to name it in such ways. Try using list or dict which group variables in a more efficient way!
a dict is one way to maintain an associative array.
dict = {}
dict[str] = calc();
dict"; this shadows the builtin dict, which is the dictionary type, which you may need to call at some point.
eval