ValueError: substring not found

[nby2001]

Let me first start this off by stating that I am a complete beginner to coding and my attempts to fix this have been limited. I am trying to follow this Arduino controlled piano robot. It takes a textified midi file and uses python to translate it into 8-bit.

output_file = open("translated.txt", "w")
input_file = open("C:\\Users\\nby20\\Downloads\\megalovania.txt")
raw_input_data = input_file.read()
work_data = raw_input_data.splitlines()
result = []

#output_file = open("result.txt", "w")

def main():

    for a in work_data:
        temp_time = time_finder(a)
        
        
        if result == []:
            result.append(str(temp_time) + ",")
            if on_off_finder(a):
                result[-1] += set_bit(True, note_finder(a))
            elif not on_off_finder(a):
                result[-1] += set_bit(True, note_finder(a))
                
        elif time_finder_comm(result[-1]) == temp_time:
            result[-1] = str(temp_time) + "," + set_bit_prev(on_off_finder(a), note_finder(a), -1)

        elif time_finder_comm(result[-1]) != temp_time:
            result.append(str(temp_time) + "," + set_bit_prev(on_off_finder(a), note_finder(a), -1))

    for b in result:
        output_file.write(b)
        output_file.write("\n")

    output_file.close()
            
def set_bit(On, note):
    #Takes boolean for if it is on or not, and note number.
    #Generates bit
    if(note >= 21 and note <= 28 and On):
        return str(2**(note - 21)) + ",0,0,0,0,0,0,0,0,0,0"
    elif(note >= 29 and note <= 36 and On):
        return "0," + str(2**(note - 29)) + ",0,0,0,0,0,0,0,0,0"
    elif(note >= 37 and note <= 44 and On):
        return "0,0," + str(2**(note - 37)) + ",0,0,0,0,0,0,0,0"
    elif(note >= 45 and note <= 52 and On):
        return "0,0,0," + str(2**(note - 45)) + ",0,0,0,0,0,0,0"
    elif(note >= 53 and note <= 60 and On):
        return "0,0,0,0," + str(2**(note - 53)) + ",0,0,0,0,0,0"
    elif(note >= 61 and note <= 68 and On):
        return "0,0,0,0,0," + str(2**(note - 61)) + ",0,0,0,0,0"
    elif(note >= 69 and note <= 76 and On):
        return "0,0,0,0,0,0," + str(2**(note - 69)) + ",0,0,0,0"
    elif(note >= 77 and note <= 84 and On):
        return "0,0,0,0,0,0,0," + str(2**(note - 77)) + ",0,0,0"
    elif(note >= 85 and note <= 92 and On):
        return "0,0,0,0,0,0,0,0," + str(2**(note - 85)) + ",0,0"
    elif(note >= 93 and note <= 100 and On):
        return "0,0,0,0,0,0,0,0,0," + str(2**(note - 93)) + ",0"
    elif(note >= 101 and note <= 108 and On):
        return "0,0,0,0,0,0,0,0,0,0," + str(2**(note - 101))
    else:
        return "0,0,0,0,0,0,0,0,0,0,0"

def set_bit_prev(On, note, index):
    #Same as set_bit but previous aware
    temp = result[index]
    temp = temp[(temp.find(",") + 1):]
    
    if(note >= 21 and note <= 28):
        local_temp = temp[0:temp.find(",")]
        if(On):
            return str(int(local_temp) + (2**(note - 21))) + temp[temp.find(","):]
        if(not On):
            return str(int(local_temp) - (2**(note - 21))) + temp[temp.find(","):]
        
    elif(note >= 29 and note <= 36):
        local_temp = temp[(temp.find(",") + 1):indexTh(temp, ",", 2)]
        if(On):
            return temp[0:temp.find(",") + 1] + str(int(local_temp) + (2**(note - 29))) + temp[indexTh(temp, ",", 2):]
        if(not On):
            return temp[0:temp.find(",") + 1] + str(int(local_temp) - (2**(note - 29))) + temp[indexTh(temp, ",", 2):]
        
    elif(note >= 37 and note <= 44):
        local_temp = temp[(indexTh(temp, ",", 2) + 1):indexTh(temp, ",", 3)]
        if(On):
            return temp[0:indexTh(temp, ",", 2) + 1] + str(int(local_temp) + (2**(note - 37))) + temp[indexTh(temp, ",", 3):]
        if(not On):
            return temp[0:indexTh(temp, ",", 2) + 1] + str(int(local_temp) - (2**(note - 37))) + temp[indexTh(temp, ",", 3):]
        
    elif(note >= 45 and note <= 52):
        local_temp = temp[(indexTh(temp, ",", 3) + 1):indexTh(temp, ",", 4)]
        if(On):
            return temp[0:indexTh(temp, ",", 3) + 1] + str(int(local_temp) + (2**(note - 45))) + temp[indexTh(temp, ",", 4):]
        if(not On):
            return temp[0:indexTh(temp, ",", 3) + 1] + str(int(local_temp) - (2**(note - 45))) + temp[indexTh(temp, ",", 4):]
        
    elif(note >= 53 and note <= 60):
        local_temp = temp[(indexTh(temp, ",", 4) + 1):indexTh(temp, ",", 5)]
        if(On):
            return temp[0:indexTh(temp, ",", 4) + 1] + str(int(local_temp) + (2**(note - 53))) + temp[indexTh(temp, ",", 5):]
        if(not On):
            return temp[0:indexTh(temp, ",", 4) + 1] + str(int(local_temp) - (2**(note - 53))) + temp[indexTh(temp, ",", 5):]
        
    elif(note >= 61 and note <= 68):
        local_temp = temp[(indexTh(temp, ",", 5) + 1):indexTh(temp, ",", 6)]
        if(On):
            return temp[0:indexTh(temp, ",", 5) + 1] + str(int(local_temp) + (2**(note - 61))) + temp[indexTh(temp, ",", 6):]
        if(not On):
            return temp[0:indexTh(temp, ",", 5) + 1] + str(int(local_temp) - (2**(note - 61))) + temp[indexTh(temp, ",", 6):]
        
    elif(note >= 69 and note <= 76):
        local_temp = temp[(indexTh(temp, ",", 6) + 1):indexTh(temp, ",", 7)]
        if(On):
            return temp[0:indexTh(temp, ",", 6) + 1] + str(int(local_temp) + (2**(note - 69))) + temp[indexTh(temp, ",", 7):]
        if(not On):
            return temp[0:indexTh(temp, ",", 6) + 1] + str(int(local_temp) - (2**(note - 69))) + temp[indexTh(temp, ",", 7):]
        
    elif(note >= 77 and note <= 84):
        local_temp = temp[(indexTh(temp, ",", 7) + 1):indexTh(temp, ",", 8)]
        if(On):
            return temp[0:indexTh(temp, ",", 7) + 1] + str(int(local_temp) + (2**(note - 77))) + temp[indexTh(temp, ",", 8):]
        if(not On):
            return temp[0:indexTh(temp, ",", 7) + 1] + str(int(local_temp) - (2**(note - 77))) + temp[indexTh(temp, ",", 8):]
        
    elif(note >= 85 and note <= 92):#error here
        local_temp = temp[(indexTh(temp, ",", 8) + 1):indexTh(temp, ",", 9)]
        if(On):
            return temp[0:indexTh(temp, ",", 8) + 1] + str(int(local_temp) + (2**(note - 85))) + temp[indexTh(temp, ",", 9):]
        if(not On):
            return temp[0:indexTh(temp, ",", 8) + 1] + str(int(local_temp) - (2**(note - 85))) + temp[indexTh(temp, ",", 9):]
        
    elif(note >= 93 and note <= 100):
        local_temp = temp[(indexTh(temp, ",", 9) + 1):indexTh(temp, ",", 10)]
        if(On):
            return temp[0:indexTh(temp, ",", 9) + 1] + str(int(local_temp) + (2**(note - 93))) + temp[indexTh(temp, ",", 10):]
        if(not On):
            return temp[0:indexTh(temp, ",", 9) + 1] + str(int(local_temp) - (2**(note - 93))) + temp[indexTh(temp, ",", 10):]
        
    elif(note >= 101 and note <= 108):
        local_temp = temp[(indexTh(temp, ",", 10) + 1):]
        if(On):
            return temp[0:indexTh(temp, ",", 10) + 1] + str(int(local_temp) + (2**(note - 101)))
        if(not On):
            return temp[0:indexTh(temp, ",", 10) + 1] + str(int(local_temp) - (2**(note - 101)))
        

def indexTh(in_string, find_this, th):
    #Takes String, string to find, and order to find string to find at that order
    #returns index
    order = 1
    last_index = 0
    while(True):
        temp = in_string.find(find_this, last_index)
        if(temp == -1):
            return -1
        if(order == th):
            return temp
        order += 1
        last_index = temp + 1

def time_finder(in_string):
    #Takes a string and finds time, returns it as an int
    time_end = in_string.index(" ")
    return int(in_string[0:time_end])

def time_finder_comm(in_string):
    #Takes a string and finds time, returns it as an int comma
    time_end = in_string.index(",")
    return int(in_string[0:time_end])
    
def note_finder(in_string):
    #Takes a string, looks for n=, returns n value as an int
    num_start = in_string.index("n=") + 2
    num_end = in_string.index("v=") - 1
    return int(in_string[num_start:num_end])

def on_off_finder(in_string):
    #takes a string, looks for On or Off, return true if On
    start = in_string.index(" ") + 1
    end = in_string.index("ch=") - 1
    if in_string[start:end] == "On":
        return True
    elif in_string[start:end] == "Off":
        return False

main()

This link to the textified midi file was used. before running the code I changed the input_file = open to text file path like so,

input_file = open("C:\\Users\\nby20\\Downloads\\megalovania.txt")

I am not sure if this is correct but I think it works.
After running the code I get a text output file as expected however it is blank and I get a few errors:

Traceback (most recent call last):
File "C:\Users\nby20\Downloads\python_code_for_translation.py", line 184, in <module>
   main()
File "C:\Users\nby20\Downloads\python_code_for_translation.py", line 23, in main
   result[-1] = str(temp_time) + "," + set_bit_prev(on_off_finder(a), note_finder(a), -1)
File "C:\Users\nby20\Downloads\python_code_for_translation.py", line 178, in on_off_finder
   end = in_string.index("ch=") - 1 
ValueError: substring not found

I found that anything except for the lines containing actual data for the notes was not readable by the code and I deleted those portions and ended up with this updated file.
After running that updated file through the code I got a similar erorr

Traceback (most recent call last):
  File "C:\Users\nby20\Downloads\python_code_for_translation (1).py", line 184, in <module>
    main()
  File "C:\Users\nby20\Downloads\python_code_for_translation (1).py", line 12, in main
    temp_time = time_finder(a)
  File "C:\Users\nby20\Downloads\python_code_for_translation (1).py", line 161, in time_finder
    time_end = in_string.index(" ")
ValueError: substring not found

Any suggestions on how to fix this would be greatly appreciated.