如何在 Python 中检查多个异常？

发布于 2024-11-06 12:19:21 字数 521 浏览 0 评论 0原文

DNA 序列 = "laksjfklsajdfklsajfklasjfklsad"

    while True:
        lMerLength = input("Please enter the length of the l-mers of the universal array :")
        try:
            if len(DNASequence) >= lMerLength > 0:
                break
        except SyntaxError:
            pass
        #This is not working. How do I check for multiple exceptions in Python?
        except NameError:
            pass
        print "ERROR: Please check your input. You entered an invalid input."

原文

DNASequence = "laksjfklsajdfklsajfklasjfklsad"

    while True:
        lMerLength = input("Please enter the length of the l-mers of the universal array :")
        try:
            if len(DNASequence) >= lMerLength > 0:
                break
        except SyntaxError:
            pass
        #This is not working. How do I check for multiple exceptions in Python?
        except NameError:
            pass
        print "ERROR: Please check your input. You entered an invalid input."

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注定孤独终老 2024-11-13 12:19:21

以下是检查多个异常的方法。

尝试：

    ..............

除了（语法错误，名称错误，...）：

    ..............

最后：

    .............

Here is how you check for multiple exceptions.

try:

    ..............

except (SyntaxError, NameError, ...):

    ..............

finally:

    .............

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む无字情书 2024-11-13 12:19:21

问题是，input 返回一个字符串，并且您将 if 中的该字符串与 int 进行比较。在 python 2.x 中，您应该使用 raw_input 而不是 input：

DNASequence = "laksjfklsajdfklsajfklasjfklsad"
while True:
    try:
        lMerLength = int(raw_input("Please enter the length of the l-mers of the universal array :"))
    except ValueError:
        print "ERROR: Please check your input. You entered an invalid input."
        continue
    if len(DNASequence) >= lMerLength > 0:
        break
    print "ERROR: Please check your input. You entered an invalid input."

The problem is, that input returns a string and you compare that string in your if to an int. And in python 2.x you should use raw_input instead of input:

DNASequence = "laksjfklsajdfklsajfklasjfklsad"
while True:
    try:
        lMerLength = int(raw_input("Please enter the length of the l-mers of the universal array :"))
    except ValueError:
        print "ERROR: Please check your input. You entered an invalid input."
        continue
    if len(DNASequence) >= lMerLength > 0:
        break
    print "ERROR: Please check your input. You entered an invalid input."

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