Python 3.8导入模块和自定义模块的顺序

时间:2020-09-23 21:32:33

标签: python python-3.x python-import

我对导入顺序和使用感到困惑。 正如您在下面的代码中看到的那样,首先,我首先导入psycopg2。 然后我导入data_connect(依赖于psycopg2),所以有两个问题: (1)为什么解释器看不到我已经导入了psycopg2? (2)如何解决? 谢谢!

错误消息:

File "C:\home\partscobra.com\wwwroot\data_connect.py" in data_connect:
db_conn = psycopg2.connect(...
NameError: name 'psycopg2' is not defined"

main.py:

import psycopg2
from data_connect import data_connect, data_cursor
#error here
[snip]

data_connect.py:

def data_connect():
    t_host = "blahblahblah"
    t_port = "5432"
    t_dbname = "inventory"
    t_user = "remote"
    t_pw = "blahblahblah"
    db_conn = psycopg2.connect(
        host=t_host,
        port=t_port,
        dbname=t_dbname,
        user=t_user,
        password=t_pw
        )
    db_conn.autocommit=True
    return db_conn

def data_cursor():
    db_conn = data_connect()
    db_cursor = db_conn.cursor()
    return db_cursor

1 个答案:

答案 0 :(得分:3)

您导入的内容将添加到当前名称空间(在这种情况下为main模块的全局名称空间),而不是每个模块(例如data_connect)。

如果您在import psycopg2data_connect.py,则psycopg2将被添加到data_connect模块的全局命名空间中。