NameError：未定义全局名称

I'm using Python 2.6.1 on Mac OS X.

我在Mac OS X上使用Python 2.6.1。

I have two simple Python files (below), but when I run

我有两个简单的Python文件（下面），但是当我运行时

python update_url.py

I get on the terminal:

我上了航站楼：

Traceback (most recent call last):
  File "update_urls.py", line 7, in <module>
    main()
  File "update_urls.py", line 4, in main
    db = SqliteDBzz()
NameError: global name 'SqliteDBzz' is not defined

I tried renaming the files and classes differently, which is why there's x and z on the ends. ;)

我尝试以不同方式重命名文件和类，这就是为什么两端都有x和z的原因。 ;）

File sqlitedbx.py

class SqliteDBzz:
    connection = ''
    curser = ''

    def connect(self):
        print "foo"

    def find_or_create(self, table, column, value):
        print "baar"

File update_url.py

import sqlitedbx

def main():
    db = SqliteDBzz()
    db.connect

if __name__ == "__main__":
    main()

4 个解决方案

#1

You need to do:

你需要这样做：

import sqlitedbx

def main():
    db = sqlitedbx.SqliteDBzz()
    db.connect()

if __name__ == "__main__":
    main()

#2

try

尝试

from sqlitedbx import SqliteDBzz

#3

Importing the namespace is somewhat cleaner. Imagine you have two different modules you import, both of them with the same method/class. Some bad stuff might happen. I'd dare say it is usually good practice to use:

导入命名空间更简洁一些。想象一下，您导入了两个不同的模块，它们都具有相同的方法/类。可能会发生一些不好的事情我敢说这通常是一种好习惯：

import module

over

过度

from module import function/class

#4

That's How Python works. Try this :

这就是Python的工作方式。尝试这个：

from sqlitedbx import SqliteDBzz

Such that you can directly use the name without the enclosing module.Or just import the module and prepend 'sqlitedbx.' to your function,class etc

这样你就可以直接使用没有封闭模块的名称。或者只是导入模块并添加'sqlitedbx'。你的功能，课程等

#1