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报错： _tkinter.TclError: cannot use geometry manager pack inside . which already has slaves managed by grid 原因： 一个程序中，只能使用一种布局，否则会报上面的错误。
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报错： _tkinter.TclError: cannot use geometry manager pack inside . which already has slaves managed by grid 原因： 一个程序中，只能使用一种布局，否则会报上面的错误。
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据这里解释为文件名字和pymysql module名字重复了。麻蛋，原来还这么弱智。
Error
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='', db='pymysql')
AttributeError: 'module' object has no attribute 'connect'
code
import pymysql
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='', db='pymysql')
cur = conn.cursor()
cur.execute("SELECT Host,User FROM user")
print(cur.description)
print()
for row in cur:
print(row)
cur.close()
conn.close()