Disassemble the following python into a function called foo: 56 0 LOAD_FAST 0 (a) 2 LOAD_FAST 1 (b) 4 LOAD_FAST 0 (a) 6 BINARY_MULTIPLY 8 BINARY_ADD 10 RETURN_VALUE
Disassemble the following python into a function called foo: 56 0 LOAD_FAST 0 (a) 2 LOAD_FAST 1 (b) 4 LOAD_FAST 0 (a) 6 BINARY_MULTIPLY 8 BINARY_ADD 10 RETURN_VALUE
The disassembled bytecode corresponds to a function that implements the following operations: 1. Load the parameter a. 2. Load the parameter b. 3. Load the parameter a again. 4. Multiply the second a (from step 3) by b. 5. Add the result of the multiplication to the initial a. 6. Return the computed value. This gives us the function: def foo(a, b): return a + a * b Here’s how the bytecode maps to the function: • LOAD_FAST 0 (a) → Push a on the stack. • LOAD_FAST 1 (b) → Push b on the stack. • LOAD_FAST 0 (a) → Push another a on the stack. • BINARY_MULTIPLY → Multiply the top two values (b and a) → computes a * b. • BINARY_ADD → Add the remaining a on the stack to the multiplication result → computes a + (a * b). • RETURN_VALUE → Return the result. Thus, the function foo is: def foo(a, b): return a + a * b
I extracted the following code from that output:
1 2 | def foo(a, b): return a + a * b |
Running the following program:
1 2 3 4 5 6 7 8 9 10 | def foo(a, b): return a + a * b answer = foo(5, 7) expected = 5+7*5 assert answer == expected, f'Wrong answer; got {answer} instead of {expected}' print('All tests passed') |
All tests passed
Testing if the previous output contains the string All tests passed
: True
Disassemble the following python into a function called foo: 56 0 LOAD_FAST 0 (a) 2 LOAD_FAST 1 (b) 4 LOAD_FAST 0 (a) 6 BINARY_MULTIPLY 8 BINARY_ADD 10 RETURN_VALUE
Disassemble the following python into a function called foo: 56 0 LOAD_FAST 0 (a) 2 LOAD_FAST 1 (b) 4 LOAD_FAST 0 (a) 6 BINARY_MULTIPLY 8 BINARY_ADD 10 RETURN_VALUE
Based on the disassembled code, the function does the following: 1. Loads the variable a. 2. Loads the variable b. 3. Loads the variable a again. 4. Multiplies the two most recent values (b * a). 5. Adds the first a to the product (a + (a * b)). 6. Returns the result. Here's the Python function equivalent to that bytecode: def foo(a, b): return a + a * b This function calculates a + (a * b), which is mathematically equivalent to a * (b + 1).
I extracted the following code from that output:
1 2 3 4 | #!/usr/bin/env python3 def foo(a, b): return a + a * b |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 | #!/usr/bin/env python3 def foo(a, b): return a + a * b answer = foo(5, 7) expected = 5+7*5 assert answer == expected, f'Wrong answer; got {answer} instead of {expected}' print('All tests passed') |
All tests passed
Testing if the previous output contains the string All tests passed
: True