自动 Python 翻译 2 到 3 错误

Question

我想将 Python2 代码翻译成 Python 3.It 非常简单，但它不起作用

import sys
import MySQLdb
import Cookbook
try:
conn = Cookbook.connect ()
print "Connected"
except MySQLdb.Error, e:
print "Cannot connect to server"
print "Error code:", e.args[0]
print "Error message:", e.args[1]
sys.exit (1)
conn.close ()
print "Disconnected"

我在终端中得到了这个

2to3 harness.py
RefactoringTool: Skipping optional fixer: buffer
RefactoringTool: Skipping optional fixer: idioms
RefactoringTool: Skipping optional fixer: set_literal
RefactoringTool: Skipping optional fixer: ws_comma
RefactoringTool: Can't parse harness.py: ParseError: bad input: type=1, value='print', context=('', (9, 0))
RefactoringTool: No files need to be modified.
RefactoringTool: There was 1 error:
RefactoringTool: Can't parse harness.py: ParseError: bad input: type=1, value='print', context=('', (9, 0))

为什么？

Answer 1

不知道这是否能解决你的问题，但你可以尝试修复你的缩进：

import sys
import MySQLdb
import Cookbook
try:
conn = Cookbook.connect ()
print "Connected"
except MySQLdb.Error, e:
print "Cannot connect to server"
print "Error code:", e.args[0]
print "Error message:", e.args[1]
sys.exit (1)
conn.close ()
print "Disconnected"

Answer 2

我认为问题可能出在MySQLdb上。此包最多仅支持 2.7，不支持 python 3。目前MySQL-python 1.2.5是最新版本(25-07-2017(

MySQL 版本 3.23 至 5.5 和 Python-2.4 至 2.7 目前是 支持。Python-3.0 将在未来的版本中得到支持。PyPy 是 支持。

Answer 3

这就是2to3 的作用

2to3 new.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 new.py
--- new.py  (original)
+++ new.py  (refactored)
@@ -4,12 +4,12 @@
try:
conn = Cookbook.connect ()
-    print "Connected"
-except MySQLdb.Error, e:
-    print "Cannot connect to server"
-    print "Error code:", e.args[0]
-    print "Error message:", e.args[1]
+    print("Connected")
+except MySQLdb.Error as e:
+    print("Cannot connect to server")
+    print("Error code:", e.args[0])
+    print("Error message:", e.args[1])
sys.exit (1)
conn.close ()
-print "Disconnected"
+print("Disconnected")
RefactoringTool: Files that need to be modified:
RefactoringTool: new.py

我进一步改变了

except MySQLdb.Error as e:

现在我有 Python3 代码。