Python Error: UnboundLocalError: local variable 'sum_time1' referenced before assignment

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

To fix this error, you need to ensure the variable 'sum_time1' is assigned a value before it's referenced. Here are some possible solutions depending on your code's context:

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 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 your code's context and choose the solution that best fits your situation.