仅用if/else/elif实现Python成绩计算器：移除最低分功能求助

核心问题解决：用条件语句确定最低分 #

要仅通过if/else找出四个测试分数中的最低分，可以先初始化变量存储当前最低分，再逐个与其他分数比较更新：

# 初始化最低分为第一个测试分数
lowest_score = iTest1
# 依次与其他分数比较，更新最低分
if iTest2 < lowest_score:
    lowest_score = iTest2
if iTest3 < lowest_score:
    lowest_score = iTest3
if iTest4 < lowest_score:
    lowest_score = iTest4

修正原代码中的错误 #

1. 输入合法性判断逻辑错误
   原代码中sDrop的判断条件if sDrop != "Y" or "N" or "y" or "n"永远为True（非空字符串在布尔判断中为真），正确写法如下：

if sDrop not in ("Y", "y", "N", "n"):
    print("Enter Y or N to drop the lowest grade.")
    raise SystemExit

2. 未定义score变量
   需要先根据是否移除最低分计算平均分，再进行等级判定。

完整修正代码 #

# Input
sName = str(input("Name of person that we are calculating the grades for: "))

iTest1 = int(input("Test 1: "))
iTest2 = int(input("Test 2: "))
iTest3 = int(input("Test 3: "))
iTest4 = int(input("Test 4: "))

sDrop = str(input("Do you wish to drop the lowest grade Y or N? "))

# Test If Statements
if iTest1 <= 0:
    print("Test scores must be greater than 0.")
    raise SystemExit
if iTest2 <= 0:
    print("Test scores must be greater than 0.")
    raise SystemExit
if iTest3 <= 0:
    print("Test scores must be greater than 0.")
    raise SystemExit
if iTest4 <= 0:
    print("Test scores must be greater than 0.")
    raise SystemExit

# 修正输入合法性判断
if sDrop not in ("Y", "y", "N", "n"):
    print("Enter Y or N to drop the lowest grade.")
    raise SystemExit

# 用if语句确定最低分
lowest_score = iTest1
if iTest2 < lowest_score:
    lowest_score = iTest2
if iTest3 < lowest_score:
    lowest_score = iTest3
if iTest4 < lowest_score:
    lowest_score = iTest4

# 计算总分与平均分
total_score = iTest1 + iTest2 + iTest3 + iTest4
if sDrop.lower() == "y":
    score = (total_score - lowest_score) / 3
else:
    score = total_score / 4

# Grade Scale
if score >= 97.0:
    grade = "A+"
elif score >= 94.0 and score <= 96.9:
    grade = "A"
elif score >= 90.0 and score <= 93.9:
    grade = "A-"
elif score >= 87.0 and score <= 89.9:
    grade = "B+"
elif score >= 84.0 and score <= 86.9:
    grade = "B"
elif score >= 80.0 and score <= 83.9:
    grade = "B-"
elif score >= 77.0 and score <= 79.9:
    grade = "C+"
elif score >= 74.0 and score <= 76.9:
    grade = "C"
elif score >= 70.0 and score <= 73.9:
    grade = "C-"
elif score >= 67.0 and score <= 69.9:
    grade = "D+"
elif score >= 64.0 and score <= 66.9:
    grade = "D"
elif score >= 60.0 and score <= 63.9:
    grade = "D-"
else:
    grade = "F"

# 输出结果
print(f"\nCalculation for {sName}:")
print(f"Average score: {score:.2f}")
print(f"Final grade: {grade}")

说明 #

• 代码通过逐步比较的if语句确定四个分数中的最低分，完全符合仅使用if/else/elif的要求。
• 修正了原代码中的逻辑错误，补充了结果输出部分，让功能更完整。

内容的提问来源于stack exchange，提问作者emily isaacs