python 3.7 w 两个 arguments 的正确提升翻译

Question

如何将此代码从 Python 2 转换为 Python 3：

except ET.XMLSyntaxError, log:
    #This exception raised if the file has parse errors in it
    logging.error("XSD: " + log.message)        
    raise SyntaxError, log.message

我实际上不确定raise线在做什么。 我已经换了

except ET.XMLSyntaxError, log:

和

except ET.XMLSyntaxError as log:

Background: I upgraded my system to python 3.7 and our build is not working with a number of Python scripts though it might be faster to update our scripts to Python 3 than revert my ubuntu environment.

Answer 1

立即解决您的问题是：

raise SyntaxError(log.message)

如果您有很多 Python 2.x 脚本，我建议使用2to3工具将其从 python 2.x 转换为 3.x。 该文档甚至在此处提出了您要求的raise更改：

raise

将raise E, V转换为raise E(V) ，并将raise E, V, T转换为raise E(V).with_traceback(T) 。 如果E是tuple ，则翻译将不正确，因为在 3.0 中已删除了用元组替换异常。

下面是一段代码片段，代码采用 Python 2.x 异常格式，我们将在其上运行2to3 ：

import logging

try:
    print "hello"
except Exception, log:
    #This exception raised if the file has parse errors in it
    logging.error("XSD: " + log.message)
    raise Exception, log.message

运行2to3

# As needed: pip install 2to3
> 2to3 code.py
RefactoringTool: Skipping optional fixer: buffer
RefactoringTool: Skipping optional fixer: idioms
RefactoringTool: Skipping optional fixer: set_literal
RefactoringTool: Skipping optional fixer: ws_comma
RefactoringTool: Refactored code.py
--- code.py (original)
+++ code.py (refactored)
@@ -1,8 +1,8 @@
 import logging

 try:
-   print "hello"
-except Exception, log:
+   print("hello")
+except Exception as log:
    #This exception raised if the file has parse errors in it
    logging.error("XSD: " + log.message)
-   raise Exception, log.message
+   raise Exception(log.message)
RefactoringTool: Files that need to be modified:
RefactoringTool: code.py