IndexOutOfBound 并以逗号分隔存储

Question

如果一个字符串要么遵循这种格式，例如'a,b,c,d'（其中a、b、c、d都是int) 或完全为空。例如：

179,170,271,83
null
143,406,299,44
145,403,299,44
142,404,299,44

31,450,337,36

null

90,269,242,32
87,266,244,35
null
272,251,223,119
27,40,316,10

如何存储 a、b、c、d 的值？

我尝试使用分隔逗号并检查空字符串，但没有帮助

if string:
      txt = string.split(',')
      height = txt[0]
      left = txt[1]
      top = txt[2]
      width = txt[3]
else:
      height = ""
      left = ""
      top = ""
      width = ""

Answer 1

在 Python 中很常见，在这种情况下使用 try/except 而不是先进行测试。这通常称为 asking for forgiveness not permission。为此，您可以将预期的情况包装在 try 中，并在 except:

中设置边缘情况

def printDims(s):
    try:
        height, left, top, width = s.split(',')
    except ValueError:
         height, left, top, width = [''] * 4
    finally:
        print(height, left, top, width)


printDims("1,2,3,4") # prints 1, 2, 3, 4
printDims("")        # prints the empty strings

Answer 2

检查txt的长度：

if string:
    txt = string.split(',')
    if len(txt) == 4:
        height = txt[0]
        left = txt[1]
        top = txt[2]
        width = txt[3]
    else:
        height = ""
        left = ""
        top = ""
        width = ""
else:
    height = ""
    left = ""
    top = ""
    width = ""

IndexOutOfBound 并以逗号分隔存储

IndexOutOfBound and storing with comma split

python

indexoutofboundsexception