Python < 0x>输出的函数

Question

我写了一个新函数，当我执行它时，我得到一个错误：

<function read_grades at 0x000001F69E0FC8C8>

好的，下面是我的代码：

def add(x, y):
    z = x / y * 100
    return z

def calc_grade(perc):
    if perc < 50:
        return "1"
    if perc <  60:
        return "2"
    if perc < 75:
        return "3"
    if perc < 90:
        return "4"
    if perc >= 90:
        return "5"

def calc_command():
    num1 = input("Input your points: ")
    num2 = input("Input maximum points: ")
    num3 = add(float(num1), float(num2))
    grade = calc_grade(num3)
    print("This is your result:", str(num3) + "%")
    print("Your grade:", grade)
    save = open("grades.txt", "r")
    read_grades = save.read()
    save = open("grades.txt", "w")
    save.write(read_grades + grade)
    save.close()

def read_grades():
    save = open("grades.txt", "r")
    read_grades = save.read()
    grades = read_grades.split()
    save.close()
    return grades

while True:
    command = input("Input your command: ")
    if command == "CALC":
        calc_command()
    elif command == "EXIT":
        break
    elif command == "GRADES":
        print(read_grades)
    elif command == "HELP":
        print("These are the commands:\nCALC - Calculates your grade and writes in the file.\nEXIT - Exits the program.\nGRADES - Reads your previous grades.\nHELP - This command. It helps you.")
    else:
        print("You inputed an invalid command. Type HELP for help.")

当我执行read_grades()函数或GRADES命令时，会出现此错误。

对于那些标记了这个问题的人:我做了一些搜索，我没有找到那篇文章，现在我读了它，我不明白答案

Answer 1

这不是运行时错误，您打印了一个函数

print(read_grades)

试着调用它

read_grades() 

你可以在这里覆盖你的函数

read_grades = save.read()

因此，建议不要使用与函数名冲突的变量名