导入错误，无法从“y”导入“x”

Question

你好，我想从另一个.py程序导入一个类

我试着用python-m运行它（来自关于Stackoverflow的另一个问题）

from back import b
from myscreen import Toplevel1 as t1
from mysqlscript import mysqlfunction

我以为它会显示一个Tkinter屏幕，但它给了我这个。。。你知道吗

ImportError: cannot import name 'Toplevel1' from 'myscreen' (C:\Users\myname\Desktop\work\myscreen.py)

Tkinter屏幕：

self.Label1 = tk.Label(top)
        self.Label1.place(relx=0.167, rely=0.044, height=21, width=394)
        self.Label1.configure(background="#d9d9d9")
        self.Label1.configure(disabledforeground="#a3a3a3")
        self.Label1.configure(foreground="#000000")
        self.Label1.configure(text='''Optionen:''')
        self.Label1.configure(width=394)

        self.Button1 = tk.Button(top)
        self.Button1.place(relx=0.383, rely=0.133, height=24, width=157)
        self.Button1.configure(activebackground="#ececec")
        self.Button1.configure(activeforeground="#000000")
        self.Button1.configure(background="#d9d9d9")
        self.Button1.configure(disabledforeground="#a3a3a3")
        self.Button1.configure(foreground="#000000")
        self.Button1.configure(highlightbackground="#d9d9d9")
        self.Button1.configure(highlightcolor="black")
        self.Button1.configure(pady="0")
        self.Button1.configure(text='''Notfall''')
        self.Button1.configure(width=157)
        self.Button1.configure(command= b(self = None, a1 = Toplevel1))

        self.Button1_1 = tk.Button(top)
        self.Button1_1.place(relx=0.383, rely=0.2, height=24, width=157)
        self.Button1_1.configure(activebackground="#ececec")
        self.Button1_1.configure(activeforeground="#000000")
        self.Button1_1.configure(background="#d9d9d9")
        self.Button1_1.configure(disabledforeground="#a3a3a3")
        self.Button1_1.configure(foreground="#000000")
        self.Button1_1.configure(highlightbackground="#d9d9d9")
        self.Button1_1.configure(highlightcolor="black")
        self.Button1_1.configure(pady="0")
        self.Button1_1.configure(text='''A Big option to chose''')

        self.Button1_2 = tk.Button(top)
        self.Button1_2.place(relx=0.383, rely=0.267, height=24, width=157)
        self.Button1_2.configure(activebackground="#ececec")
        self.Button1_2.configure(activeforeground="#000000")
        self.Button1_2.configure(background="#d9d9d9")
        self.Button1_2.configure(disabledforeground="#a3a3a3")
        self.Button1_2.configure(foreground="#000000")
        self.Button1_2.configure(highlightbackground="#d9d9d9")
        self.Button1_2.configure(highlightcolor="black")
        self.Button1_2.configure(pady="0")
        self.Button1_2.configure(text='''ammm....this is a option''')

        self.Button1_3 = tk.Button(top)
        self.Button1_3.place(relx=0.017, rely=0.911, height=24, width=127)
        self.Button1_3.configure(activebackground="#ececec")
        self.Button1_3.configure(activeforeground="#000000")
        self.Button1_3.configure(background="#d9d9d9")
        self.Button1_3.configure(disabledforeground="#a3a3a3")
        self.Button1_3.configure(foreground="#000000")
        self.Button1_3.configure(highlightbackground="#d9d9d9")
        self.Button1_3.configure(highlightcolor="black")
        self.Button1_3.configure(pady="0")
        self.Button1_3.configure(text='''back''')
        self.Button1_3.configure(width=127)

        self.Button1_4 = tk.Button(top)
        self.Button1_4.place(relx=0.383, rely=0.4, height=24, width=157)
        self.Button1_4.configure(activebackground="#ececec")
        self.Button1_4.configure(activeforeground="#000000")
        self.Button1_4.configure(background="#d9d9d9")
        self.Button1_4.configure(disabledforeground="#a3a3a3")
        self.Button1_4.configure(foreground="#000000")
        self.Button1_4.configure(highlightbackground="#d9d9d9")
        self.Button1_4.configure(highlightcolor="black")
        self.Button1_4.configure(pady="0")
        self.Button1_4.configure(text='''another option''')

        self.Button1_5 = tk.Button(top)
        self.Button1_5.place(relx=0.383, rely=0.333, height=24, width=157)
        self.Button1_5.configure(activebackground="#ececec")
        self.Button1_5.configure(activeforeground="#000000")
        self.Button1_5.configure(background="#d9d9d9")
        self.Button1_5.configure(disabledforeground="#a3a3a3")
        self.Button1_5.configure(foreground="#000000")
        self.Button1_5.configure(highlightbackground="#d9d9d9")
        self.Button1_5.configure(highlightcolor="black")
        self.Button1_5.configure(pady="0")
        self.Button1_5.configure(text='''one option''')

它一直给我那个错误。你知道吗

所以我试图从另一个文件导入一个类。你知道吗

Answer 1

确保C:\Users\myname\Desktop\work出现在PYTHONPATHenv变量中

例如，在cygwinbash中使用：

$ cd work
$ export PYTHONPATH=.
$ python foo.py

对于详细的调试，import sys，然后检查sys.path。你知道吗

而且，首先使import myscreen成功的工作更简单。 例如，如果您pip install编辑了一个提供myscreen模块的包 但是缺少Toplevel1符号，更简单的import会揭示这一点。你知道吗