How to improve this Python 3 code?

[buran]

• when open a file, better use with context anager
  

  with open('python_ist_cool_tabelle.txt', 'r') as f:
      # work with file f

• This file is short and there is no problem to read it in memory with readlines(), but you should know that you can iterate over f
  

  for line in f:

• always use descriptive names. a is not such name. new_list is better as e.g. students_grades, names_list - just names, i and k is better as line or student
  
  
• you can use extended iterable unpacking
  

  name, *grades = line.split()

• don't use built-in functions, modules, etc. as names. In this case sum overrides the built-in function with same name.
  
  
• No need to have separate lists. if you are going to use data further, you can have a better data structure - e.g. list of dicts or list of custom Student class, etc.
  
  
• if you are going to just print average grade - you can do without any collection
  
  
• when iterate over list, etc. you iteterate over elements, no need to use indexes. when you are iterating over multiple iterables simultaneously, use zip()
  
  

  for name, average in zip(name, grade_averages):

• when print, try to use string formatting - e.g. f-strings or str.format() method. Concatenation works but you have to convert everything to str.
  
  
• you can make your code better if you split in small chunks and define functions. this way the code is reusable, easy to test, etc. For example you may have a function that will parse the line, and return name and grades converted to int. Next step would be to make use of class/OOP - e.g. Student class.
  

with open('test.txt', 'r') as f:
    students = [] # only if you have to keep data for processing later
    for line in f:
        name, *grades = line.split() # line has new-line character at the end, but in this case we don't need to strip it
        grades = [int(grade) for grade in grades] # convert grades to int
        print(f'{name} your average score is {sum(grades)/len(grades):.2f}')
        students.append({'name':name, 'grades':grades}) # add student info as dict



# print students list
print('---------------')
print(students)
print('---------------')


for student in students:
    score = sum(student['grades'])/len(student['grades']) # calculate score on separate line
    print(f"{student['name']} your average score is {score:.2f}") # use calculated score in f-string

Output:
joe your average score is 23.00
bill your average score is 20.00
sue your average score is 16.17
grace your average score is 23.67
john your average score is 35.20
---------------
[{'name': 'joe', 'grades': [10, 15, 20, 30, 40]}, {'name': 'bill', 'grades': [23, 16, 19, 22]}, {'name': 'sue', 'grades': [8, 22, 17, 14, 32, 17, 24, 21, 2, 9, 11, 17]}, {'name': 'grace', 'grades': [12, 28, 21, 45, 26, 10]}, {'name': 'john', 'grades': [14, 32, 25, 16, 89]}]
---------------
joe your average score is 23.00
bill your average score is 20.00
sue your average score is 16.17
grace your average score is 23.67
john your average score is 35.20