Help with function and sep( , ) value

[drewbty]

I was calling 3 lists to verify if the function was coded within the specs.

My file name was called list_function

import list_function

print("\nStart Testing!")

str_list1 = ['r', 'i', 'n', 'g', 'i', 'n', 'g']
str_list2 = ['r', 'e', 'd']
empty = []

print("\nlength Test")
print("List length:", list_function.length(str_list1))
print("List length:", list_function.length(empty))

The issue was that it gave this error when calling the last print function (empty)

Error:
  File line 24, in <module>
    print("List is:", list_function.to_string(empty))
  File line 24, in to_string
    result += my_list[entry + 1]
UnboundLocalError: local variable 'entry' referenced before assignment

This was solved by adding the line

if not my_list: 
    return result

Is this a clean way of doing things to account for the empty print function?

def length(my_list):

    loop_flag = True

    count = 0

    for entry in my_list:
        count += 1

    return count

 
def to_string(my_list, sep=', '):

    result = ''
    list_length = length(my_list)

    if not my_list:
        return result

    # Loop through indices except last entry.
    for entry in range(list_length -1):
        result += my_list[entry] + sep
        
    # Add last entry on.
    result += my_list[entry + 1]

    return result