Python 代码既不 运行 正确也不在 VS Code 中显示错误

Question

我正在使用 Vs 代码（Charm 在我的 PC 上运行不顺畅）进行 python 开发，它在调试后卡住了，没有显示错误或输出。

我在堆栈溢出中搜索了匹配的解决方案

weight = int(input("Enter weight: "))
unit   = input("(K)kilograms or (P)pounds? ")

if unit.upper == "P":
    (weight*=1.6)
    print("Weight in kilograms: " + weight)
else if Unit=="K":
    (weight*=1.6)
    print("Weight in pounds: " + weight)
else:
    print("ERROR INPUT IS WRONG!")

我希望它接受输入并给出转换后的输出

Answer 1

您的脚本：

• 漏掉一个 ()
• 使用未知名称Unit
• 尝试添加字符串和数字：print("Weight in pounds: " + weight)
• 英镑算错了吗
• 在不适用的地方使用 ()
• 使用else if ... :

---

weight = int(input("Enter weight: "))
unit   = input("(K)kilograms or (P)pounds? ")

if unit.upper == "P":                         # unit.upper()
    (weight*=1.6)                             # ( ) are wrong, needs /
    print("Weight in kilograms: " + weight)   # str + float?
else if Unit=="K":                            # unit  ... or unit.upper() as well
    (weight*=1.6)                             # ( ) are wrong
    print("Weight in pounds: " + weight)      # str + float
else:
    print("ERROR INPUT IS WRONG!")

您可以直接使用 .upper() 输入：

# remove whitespaces, take 1st char only, make upper 
unit   = input("(K)kilograms or (P)pounds? ").strip()[0].upper() 

可能更好：

weight = int(input("Enter weight: "))
while True:
    # look until valid
    unit = input("(K)kilograms or (P)pounds? ").strip()[0].upper()
    if unit in "KP":
        break
    else: 
        print("ERROR INPUT IS WRONG! K or P")

if unit == "P":                          
    weight /= 1.6                           # fix here need divide
    print("Weight in kilograms: ", weight)  # fix here - you can not add str + int
else:  
    weight *= 1.6                        
    print("Weight in pounds: ", weight) 

你应该看看 str.format:

    print("Weight in pounds: {:.03f}".format(weight))  # 137.500

参见 f.e。 Using Python's Format Specification Mini-Language to align floats