Given the following code snippet, which statement correctly allows the function to update the global variable total?

1. total = 0
2. def main() :
3. avg = 0
4. for i in range(6) :
5. iSquared = i * i
6. total = total + iSquared
7. avg = total / i
8. print(total)
9. print(avg)

Question

Given the following code snippet, which statement correctly allows the function to update the global variable total?

1. total = 0
2. def main() :
3.    avg = 0
4.    for i in range(6) :
5.       iSquared = i * i
6.       total = total + iSquared
7.    avg = total / i
8.    print(total)
9.    print(avg)

BlackTom AI · Accepted Answer

The question asks which modification enables the function to update the global variable total while executing the given code snippet.
Option 1: 'move line 1 inside the function definition' would place total = 0 inside the function. However, without declaring total as global inside the function, Python will treat total as a local variable within main, so the assignment total = total + iSquared would refer to a local total that hasn’t been initialized yet, causing an error. Therefore this change does not correctly enable updating the global total.
Option 2: 'line 1 already allows the total variable to be updated' is incorrect because assigning to total inside a function creates/edits a local variable by default. Without a global declaration, the global total remains untouched, so the function cannot update the global total.
Option 3: 'add the keyword global to line 1' suggests placing a global declaration on a line outside of any function. In Python, the global statement must appear inside a function scope to affect names that are assigned within that function. Placing 'global' on line 1 outside a function does not influence the local scope of main, so it will not enable the function to update the global total. Hence this option is not viable.
Option 4: 'add the statement global total after line 2' envisions inserting 'global total' at the start of the function body (after def main():). This is exactly how Python marks total as a global variable within that function, ensuring that assignments to total inside the loop modify the global total rather than creating a new local variable. This aligns with Python's scoping rules and enables the intended update of the global total.

Given the following code snippet, which statement correctly allows the function to update the global variable total? 1. total = 0 2. def main() : 3. avg = 0 4. for i in range(6) : 5. iSquared = i * i 6. total = total + iSquared 7. avg = total / i 8. print(total) 9. print(avg)单项选择题

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