函数中未正确添加的数字

Question

例如，如果我输入数字'5'，'5'，'3'，'4‘，我得到'5534’。我想得到“17”，有人能给我解释一下怎么回事吗？

def grade_lab(lab_number, student_id):
    student = student_id
    lab_count = lab_number
    step1 = '1'
    gradeforstep1 = problem_solving(step1)
    step2 = '2'
    gradeforstep2 = problem_solving(step2)
    step3 = '3'
    gradeforstep3 = problem_solving(step3)
    step4 = '4'
    gradeforstep4 = problem_solving(step4)
    scoregrade = gradeforstep1 + gradeforstep2 + gradeforstep3 + gradeforstep4
    points_earned = f"Student: {student} earned {scoregrade} points on lab {lab_count}."
    return points_earned

def problem_solving(step_graded):
    stepgrade=input(f'Please enter a score 0 - 5 earned for understanding step {step_graded}:')
    finalstepgrade = stepgrade
    return finalstepgrade

def main():
    labgrade = grade_lab(3, 12345)
    print (labgrade)
    step = input()
    gradeforstep = problem_solving(step)
    print(gradeforstep)
main()

Answer 1

在添加数字之前，需要将数字转换为整数。例如：

scoregrade = int(gradeforstep1) + int(gradeforstep2) + int(gradeforstep3) + int(gradeforstep4)

编辑

或者，您可以用int()包装输入。

stepgrade=int(input(f'Please enter a score 0 - 5 earned for understanding step {step_graded}:'))

全码

def grade_lab(lab_number, student_id):
    student = student_id
    lab_count = lab_number
    step1 = '1'
    gradeforstep1 = problem_solving(step1)
    step2 = '2'
    gradeforstep2 = problem_solving(step2)
    step3 = '3'
    gradeforstep3 = problem_solving(step3)
    step4 = '4'
    gradeforstep4 = problem_solving(step4)
    scoregrade = gradeforstep1 + gradeforstep2 + gradeforstep3 + gradeforstep4
    points_earned = f"Student: {student} earned {scoregrade} points on lab {lab_count}."
    return points_earned

def problem_solving(step_graded):
    stepgrade=int(input(f'Please enter a score 0 - 5 earned for understanding step {step_graded}:'))
    finalstepgrade = stepgrade
    return finalstepgrade

def main():
    labgrade = grade_lab(3, 12345)
    print (labgrade)
    step = input()
    gradeforstep = problem_solving(step)
    print(gradeforstep)
main()

Answer 2

您的问题是对变量类型和重定向的误解。

也许仔细阅读一些免费的资源，如这些类注释，并确保您理解这些概念：Python 101:输入和转换

Answer 3

输入返回字符串，将其转换为整数以进行数值运算。由于您有一个混乱的代码，所以我在我的解决方案中清理了它：

def grade_lab(lab_number, student_id):
    scoregrade = 0
    for i in range(1,5):
        scoregrade += int(input(f'Please enter a score 0 - 5 earned for understanding step {i}:'))

    return f"Student: {student_id} earned {scoregrade} points on lab {lab_number}."

if __name__ == "__main__":
    print(grade_lab(3,12345))