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On Sunday, August 19, 2018 at 1:42:29 PM UTC+2, Steven D'Aprano wrote: > On Sun, 19 Aug 2018 03:15:32 -0700, giannis.dafnomilis wrote: > > > Thank you MRAB! > > > > Now I can get the corresponding dictionary value A[i,j,k,l] for each key > > in the varsdict dictionary. > > > > However how would I go about multiplying the value of each > > FEq_(i,_j,_k,_l) key with the A[i,j,k,l] one? Do you have any insight in > > that? > > Do you want to modify the varsdict values in place? > > varsdict['Feq_(i,_j,_k,_l)'] *= A[i,j,k,l] > > which is a short-cut for this slightly longer version: > > temp = varsdict['Feq_(i,_j,_k,_l)'] * A[i,j,k,l] > varsdict['Feq_(i,_j,_k,_l)'] = temp > > > > If you want to leave the original in place and do something else with the > result: > > result = varsdict['Feq_(i,_j,_k,_l)'] * A[i,j,k,l] > print(result) > > Do you want to modify the varsdict values in place? > > varsdict['Feq_(i,_j,_k,_l)'] *= A[i,j,k,l] > > which is a short-cut for this slightly longer version: > > temp = varsdict['Feq_(i,_j,_k,_l)'] * A[i,j,k,l] > varsdict['Feq_(i,_j,_k,_l)'] = temp > > > > If you want to leave the original in place and do something else with the > result: > > result = varsdict['Feq_(i,_j,_k,_l)'] * A[i,j,k,l] > print(result) > Thanks again for your answers Steven. I will try to explain it simpler because I think I tend to complicate things. With your help I have arrived at this point: I have the dictionary varsdict (size 5) as below Key Type Size Value FEq_(0,_0,_0,_0) float 1 1.0 FEq_(0,_0,_1,_1) float 1 1.0 FEq_(0,_0,_2,_2) float 1 1.0 FEq_(0,_0,_3,_0) float 1 1.0 FEq_(0,_0,_4,_1) float 1 1.0 and the dictionary B (size 150) as below Key Type Size Value FEq_(0,_0,_0,_0) float 1 1500.0 FEq_(0,_0,_0,_1) int 1 0 ... FEq_(0,_0,_1,_1) float 1 3300.0 ... FEq_(0,_0,_2,_2) float 1 2200.0 ... FEq_(0,_0,_4,_1) float 1 4000.0 for dictionary B the i,j,k,l ranges run as far as my input ranges when I started the model. So now I only want to multiply the values with the same keys with each other and get the sum of it. result = Sum(varsdict['FEq_(i,_j,_k,_l)']*B['FEq_(i,_j,_k,_l)'] As I mentioned above I have been trying this with {k : v * B[k] for k, v in varsdict.items() if k in B} or for key in varsdict: if key in B: print(int(varsdict[key]) * int(B[key])) but all I get is an empty dictionary.

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