Python SyntaxError:无效语法

我不确定为什么会在这方面出现

无效语法

错误。有人有什么想法吗

import _winreg

explorer = _winreg.OpenKey(
    _winreg.HKEY_CURRENT_USER,
    "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer"
    )

# list values owned by this registry key
try:
    i = 0
    while 1:
        name, value, type = _winreg.EnumValue(explorer, i)
        print repr(name),
        i += 1
except WindowsError:
    print

value, type = _winreg.QueryValueEx(explorer, "Logon User Name")

print
print "user is", repr(value)

---

要使代码在Python3上工作，请按如下所示使用print更改3行

import _winreg

explorer = _winreg.OpenKey(
    _winreg.HKEY_CURRENT_USER,
    "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer"
    )

# list values owned by this registry key
try:
    i = 0
    while 1:
        name, value, type = _winreg.EnumValue(explorer, i)

        # end="" means no new line
        print(repr(name), end="")

        i += 1
except WindowsError:
    print

value, type = _winreg.QueryValueEx(explorer, "Logon User Name")

print()
print("user is", repr(value))

---

确切地说，是什么导致了语法错误？另外，欢迎来到StackOverflow这是Python 3吗？如果是，现在是函数。