Why won't this function work as expected? List exactly one reason.
1 2 3 4 5 6 7 8 9 10 11 12 13 | def make_op_with_history(config): how = config[0] args = config[1:] if how.split()[0] == 'dot_from_papers': return [(how, make_op(config))] if how.split()[0] in ['const_add', 'const_mul']: return [(how, make_op(config))] + make_op_with_history(config[1]) out = [] for arg in args: hist = make_op_with_history(arg) out.append(hist) return [(how, make_op(config))] + out |
Why won't this function work as expected? List exactly one reason.
1 2 3 4 5 6 7 8 9 10 11 12 13 | def make_op_with_history(config): how = config[0] args = config[1:] if how.split()[0] == 'dot_from_papers': return [(how, make_op(config))] if how.split()[0] in ['const_add', 'const_mul']: return [(how, make_op(config))] + make_op_with_history(config[1]) out = [] for arg in args: hist = make_op_with_history(arg) out.append(hist) return [(how, make_op(config))] + out |
# Issue with the Function The function won't work as expected because of how it handles recursive results in the general case. When `out.append(hist)` is called, it's adding entire lists (returned by recursive calls) as elements of `out`, resulting in a nested list structure. Then, the return statement tries to concatenate `[(how, make_op(config))]` with this list of lists using the `+` operator, which will cause type errors or produce an incorrect data structure. To fix this, the function should either use `out.extend(hist)` instead of `out.append(hist)` to flatten the results, or it should modify the return statement to properly handle the nested structure.
I asked a question about why some code was incorrect. The answer is "because because the code uses append instead of extend". Does this student answer say that? Giving multiple answers is okay as long as it also says somewhere that the code should replace the append with extend. # Issue with the Function The function won't work as expected because of how it handles recursive results in the general case. When `out.append(hist)` is called, it's adding entire lists (returned by recursive calls) as elements of `out`, resulting in a nested list structure. Then, the return statement tries to concatenate `[(how, make_op(config))]` with this list of lists using the `+` operator, which will cause type errors or produce an incorrect data structure. To fix this, the function should either use `out.extend(hist)` instead of `out.append(hist)` to flatten the results, or it should modify the return statement to properly handle the nested structure. Answer either 'The student passes' or 'The student fails'.
The student passes.
Testing if the previous output contains the string student passes
: True
Why won't this function work as expected? List exactly one reason.
1 2 3 4 5 6 7 8 9 10 11 12 13 | def make_op_with_history(config): how = config[0] args = config[1:] if how.split()[0] == 'dot_from_papers': return [(how, make_op(config))] if how.split()[0] in ['const_add', 'const_mul']: return [(how, make_op(config))] + make_op_with_history(config[1]) out = [] for arg in args: hist = make_op_with_history(arg) out.append(hist) return [(how, make_op(config))] + out |
Why won't this function work as expected? List exactly one reason.
1 2 3 4 5 6 7 8 9 10 11 12 13 | def make_op_with_history(config): how = config[0] args = config[1:] if how.split()[0] == 'dot_from_papers': return [(how, make_op(config))] if how.split()[0] in ['const_add', 'const_mul']: return [(how, make_op(config))] + make_op_with_history(config[1]) out = [] for arg in args: hist = make_op_with_history(arg) out.append(hist) return [(how, make_op(config))] + out |
# Issue: Incorrect List Flattening The primary problem is in the last part of the function:
1 2 3 4 5 | out = [] for arg in args: hist = make_op_with_history(arg) out.append(hist) return [(how, make_op(config))] + out |
I asked a question about why some code was incorrect. The answer is "because because the code uses append instead of extend". Does this student answer say that? Giving multiple answers is okay as long as it also says somewhere that the code should replace the append with extend. # Issue: Incorrect List Flattening The primary problem is in the last part of the function:
1 2 3 4 5 | out = [] for arg in args: hist = make_op_with_history(arg) out.append(hist) return [(how, make_op(config))] + out |
The student fails.
Testing if the previous output contains the string student passes
: False