如何在不使用全局变量的情况下编写此代码？

Question

我必须编写一个程序，它接受输入并写出输入的数字以及它的等级。我的程序工作，但显然我只能使用局部变量。我需要改变什么，以便它只是局部变量？下面的两个变量是我目前用作全局变量的。

# This program takes intger inputs and provides a grade value for each number entered 

number = 1 
myNumbers = [] 

print("Please enter as many integer numbers as you would like. Enter -999 to exit loop") 
# This function has the user input values and exit with a sentinel value -999 
def getScores(number): 
    sentinelValue = -999 

    while(number != sentinelValue): 
     number = eval(input("Enter an integer: ")) 

     if number > -1: 
      myNumbers.append(number) 

    print("Numbers entered: ") 
    print(myNumbers, "\n") 


# This function prints out the values with the appropriate letter grade 
def printScores(): 

    print("Length of array = ", len(myNumbers)) 

    for i in range(0, len(myNumbers)): 

     if myNumbers[i] >= 90: 
      print(myNumbers[i], "is an A") 
     if myNumbers[i] >= 80 and myNumbers[i] < 90: 
      print(myNumbers[i], "is a B") 
     if myNumbers[i] >= 70 and myNumbers[i] < 80: 
      print(myNumbers[i], "is a C") 
     if myNumbers[i] >= 60 and myNumbers[i] < 70: 
      print(myNumbers[i], "is a D") 
     if myNumbers[i] >= 0 and myNumbers[i] < 60: 
      print(myNumbers[i], "is an F") 
# The main function is where we will call the other functions and print out the results 
def main(): 

    getScores(number) 
    printScores() 

# Call the main 
main() 

我仍然应该有两个单独的功能。

Answer 1

getScores不需要输入数字......它可以在循环之前创建一个默认值。它可以返回它创建的列表，而不是写一个全局变量。调用者记得返回值，并在下一次调用中使用它。

# This program takes intger inputs and provides a grade value for each number entered 

print("Please enter as many integer numbers as you would like. Enter -999 to exit loop") 
# This function has the user input values and exit with a sentinel value -999 
def getScores(): 
    sentinelValue = -999 
    number = '' 
    myNumbers = [] 
    while(number != sentinelValue): 
     number = eval(input("Enter an integer: ")) 

     if number > -1: 
      myNumbers.append(number) 

    print("Numbers entered: ") 
    print(myNumbers, "\n") 
    return myNumbers 

# This function prints out the values with the appropriate letter grade 
def printScores(myNumbers): 

    print("Length of array = ", len(myNumbers)) 
    # omit the rest for brevity... 

# The main function is where we will call the other functions and print out the results 
def main(): 
    scores = getScores() 
    printScores(scores) 

# Call the main 
main()