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A possible approach might be the following:

vars=[]
f = 0 
for counter in range(1,5):
    vars.append( var('x'+str(counter) )) 
    f += mylist[counter] * vars[counter]

Then you can use a dictionary to evaluate. Say you have n variables and want variable i in vars to take value val[i] where val is a list of values. So first construct a dictionary with

eval_dict = dict( [ (vars[i], val[i]) for i in range(n) ] )

Then you can evaluate by executing

f( eval_dict )

A possible approach might be the following:

vars=[]
f = 0 
for counter in range(1,5):
    vars.append( var('x'+str(counter) )) 
    f += mylist[counter] * vars[counter]

Then you can use a dictionary to evaluate. Say you have n variables and want variable ivars[i] in vars to take value val[i] where val is a list of values. So first construct a dictionary with

eval_dict = dict( [ (vars[i], val[i]) for i in range(n) ] )

Then you can evaluate by executing

f( eval_dict )