The first line of a function declaration ends with a colon in Python. True or false? 

This is python Regarding a function, which of the following is not true?   The def keyword is used to create a function.   A function must contain a return statement.   When a function is defined, it must have parentheses.   A function can contain another function.

In Python, use only some or all of the following concepts: decision structures, repetition structures, functions, and files. Write a program that reads five test scores from a file called "grades.txt". The program should display a letter grade for each score and the average test score. Write the following functions in the program: grade_average. This function should accept five test scores as arguments and return the average of the scores. letter_grade. This function should accept a test score as an argument and return a letter grade for the score based on the following grading scale:   Score Letter Grade 90 - 100 A 80 - 89 B 70 - 79 C 60 - 69 D Below 60 F The grades.txt file should test all possible grades.

Could you help me create a python code for this question? Thanks.