[great god please enter] call customised module error problem!!-CodePudding

My custom a login function in local call didn't ask questions, but can appear in other modules call error: TypeError: string indices must be integers
The called module:

 
Def the login () : 
While True: 
Log_user=input (" [bank] please enter the authenticated user:) 
Log_passwd=input (" [bank] enter the password for authentication: ") 
F=open (" base ", "r", encoding="utf-8") 
Try: 
The line=f.r eadline () 
Data_dict=eval (STR (line). Strip ()) 
Except SyntaxError as err: 
F. lose () 
Break 
If log_user data_dict in: 
If log_passwd==data_dict [log_user] [" password "] : 
Print (" [bank] login successful!" ) 
F. lose () 
Return True 
The else: 
Print (" [bank] user name or password error!" ) 
The continue 
The else: 
Print (" [bank] user name or password error!" ) 
The continue

Read the content of the files

 
{" jack ": {" password" : "123", "monary" : 10000}}

Call module:

 
The import of OS, sys 
BASE_DIR=OS. The path. The dirname (OS) path) dirname (OS) path) abspath (__file__))) 
Sys. Path. Append (BASE_DIR) 

The from bank import bank_def 

Bank_def. The login ()

This problem want to half a day don't understand what's going on, a great god guidance, please!!!