Question

import sys
if len(sys.argv) < 3:
    print('Not enough arguments')
elif len(sys.argv) > 3:
    print('Too many arguments')
radius = float(sys.argv[1])
height = float(sys.argv[2])
PI = 3.141592
v = PI*radius*radius*height
else:
    if radius < 0 :
        print('Radius cannot be negative')
    elif radius > 0 and height < 0 :
        print('Height cannot be negative')
    else:
        print(int(v))

我一直在用“else：”获得语法错误。代码有什么问题吗？

Answer 1

您的代码存在indentation问题。我也改变你的逻辑如下。您只想在满足所有条件时计算v：

import sys

if len(sys.argv) < 3:
    print('Not enough arguments')
elif len(sys.argv) > 3:
    print('Too many arguments')
else:
    radius = float(sys.argv[1])
    height = float(sys.argv[2])    

    if radius < 0 :
        print('Radius cannot be negative')
    elif radius > 0 and height < 0 :
        print('Height cannot be negative')
    else:
        PI = 3.141592
        v = PI*radius*radius*height
        print(int(v))

祝你好运！

Answer 2

我认为这就是你要做的事。

尝试使用此代码： -

import sys
if len(sys.argv) < 3:
    print('Not enough arguments')
elif len(sys.argv) > 3:
    print('Too many arguments')
else:
    radius = float(sys.argv[1])
    height = float(sys.argv[2])
    if radius < 0 :
        print('Radius cannot be negative')
    elif radius > 0 and height < 0 :
        print('Height cannot be negative')
    else:
        PI = 3.141592
        v = PI*radius*radius*height
        print(int(v))

<强>输出

$ python3 test200.py 25 10
19634

$ python3 test200.py 2 10
125

$ python3 test200.py 2 -10
Height cannot be negative

$ python3 test200.py -2 10
Radius cannot be negative

语句if语句无效

2 个答案: