help with sons homework

[shadow]

He has the following code but he is getting the following error nboundLocalError: local variable 'grade' referenced before assignment, can anyone help please?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66

def grade(overallmarks):     percentage = overallmarks/150*100 # Prints 'No Award' if the overall percentage mark is less than 45     if percentage <45:.         grade = "No Award"   # Prints the grade 'D' if the overall percentage mark is between 45 & 49     elif percentage >= 45 and percentage <= 49:         grade = "D"   # Prints the grade 'C' if the overall percentage mark is between 50 & 59     elif percentage >= 50 and percentage <= 59:         grade = "C"   # Prints the grade 'B' if the overall percentage mark is between 60 & 69     elif percentage >= 60 and percentage <= 69:         grade = "B"   # Prints the grade 'A' if the overall percentage mark is 70 or over     elif percentage >=70:         grade = "A"                 return grade, percentage     def main():       # Opens the studentgrades.csv file in read mode     f = open("studentgrades.csv") # Reads all of the file lines and put them in a list     rows = f.readlines()   # The loop goes through all of the rows, one by one     for counter in range(len(rows)):     # Extract the current line         line = rows[counter].strip()     # Splits and organises each line and saves in a list         fields = line.split(",")           student_name = fields[0]         coursework = fields[1]         prelim_mark = fields[2]     # Set coursework to integer         coursework = int(coursework)     # Set prelim mark to integer         prelim_mark = int(prelim_mark)     # Sets overallmarks variable to coursework add prelim mark         overallmarks = coursework + prelim_mark           finalgrade, finalpercentage = grade(overallmarks)               # Prints a line of 30 '*' to organise the data         print(30 * "*")     # Prints the student name from external file         print("Student:", student_name)     # Prints the students final percentage         print("Percentage:", finalpercentage)     # Prints the students final grade         print("Final Grade:", finalgrade)     # Prints a blank line         print()           # Boilerplate code if __name__ == '__main__':     main()

Output:
errorinal Grade: No Award

******************************
Student: Shahida Choudry
Percentage: 70.0
Final Grade: A

******************************
Student: Ian Li
Percentage: 50.0
Final Grade: C

******************************
Student: Petra Carter
Percentage: 39.33333333333333
Final Grade: No Award

Error:
Traceback (most recent call last):
  File "C:\Users\~XPS~\Desktop\student_grades.py", line 66, in <module>
    main()
  File "C:\Users\~XPS~\Desktop\student_grades.py", line 51, in main
    finalgrade, finalpercentage = grade(overallmarks)
  File "C:\Users\~XPS~\Desktop\student_grades.py", line 24, in grade
    return grade, percentage
UnboundLocalError: local variable 'grade' referenced before assignment

[Larz60+]

Indent error line 1,
period at end of line 4,
define:
grade = None
immediately after the def on line 1 (after correction indent)