On the line: a,b = trans((a,b)) I understand that the p becomes (a,b), but what happens next? Ler's say we take trans_3. Can someone explains what happens inside the function when we call trans_3((a,b))?

Hey Bondan, Thank you for your question! Let me suggest a modification to the code, where I have included 3 print-statements on lines 6, 14, 22, and 37. Then, let's study the for-loop on lines 31-35, where I have reduced the number of iterations to 3. On line 32, we assign the variable trans one of the 3 functions - trans_1, trans_2, or trans_3. From the output, we can see that the choice during the first iteration was trans_3. On line 33, we modify the integers a and b using the function trans_3. What happens in this function is the following: 1. The variable p represents the tuple (a, b) 2. Line 18 - x equals the first item in p, namely a 3. Line 19 - y equals the second item in p, namely b 4. Line 20 - x1 is computed according to Transformation 3, using variable x 5. Line 21 - y1 is computed according to Transformation 3, using variable y 6. Line 23 - the function returns the variables x1 and y1 in a tuple Going back to line 33, variable a is assigned the value x1 while variable b is assigned the value y1. These are then appended to the lists a1 and b1, respectively. Then, the second iteration comes, where, this time, the function trans_1 is chosen. The whole procedure from above repeats. Finally, trans_3 is chosen again during the third iteration. Hope this helps! Kind regards, 365 Hristina