UnboundLocalError local variable sum_time1 referenced before assignment

The error message "UnboundLocalError: local variable 'sum_time1' referenced before assignment" indicates that you are trying to access the value of a local variable before it has been assigned a value.

To fix this error, you need to make sure that the variable 'sum_time1' is assigned a value before it is referenced. Here are a few possible solutions depending on the context of your code:

1. Initialize the variable with a default value before the loop:

sum_time1 = 0
for time in times:
    sum_time1 += time

2. Use a different variable name that doesn't conflict with any existing variables or function names:

total_time = 0
for time in times:
    total_time += time

3. Check if the variable has been assigned a value before referencing it:

sum_time1 = 0
for time in times:
    if 'sum_time1' in locals():
        sum_time1 += time
    else:
        sum_time1 = time

Remember to analyze the context of your code and choose the solution that fits best.