导入模块出错，请教如何解决？

刚开始自学Python，在运行到导入模块时出现问题，具体如下，请问如何解决？
win10系统，Anaconda3-5.3.0+VS CODE（Python3.7版本)编写的Python程序，在调试的单步执行时，运行到import numpy语句时出现如下提示，具体见图片。无法打开“<frozen importlib._bootstrap>”: 找不到文件(file:///d:/python学习/学习源代码/<frozen importlib._bootstrap>)。


numpy和pandas模块始终出现提示而且无法运行下去，xlwings模块有时出现提示，有时又可以正常运行。

以下为显示的信息：

(base) D:\PYTHON学习\学习源代码>cd d:\PYTHON学习\学习源代码 && cmd /C "set "PYTHONIOENCODING=UTF-8" && set "PYTHONUNBUFFERED=1" && C:\ProgramData\Anaconda3\python.exe c:\Users\lz\.vscode\extensi**\ms-python.python-2018.10.1\pythonFiles\experimental\ptvsd_launcher.py --client --host localhost --port 64470 d:\PYTHON学习\学习源代码\test.py --noreload --nothreading "

Traceback (most recent call last):

File "c:\Users\lz\.vscode\extensi**\ms-python.python-2018.10.1\pythonFiles\experimental\ptvsd\ptvsd\wrapper.py", line

1339, in done

fut.result()

File "c:\Users\lz\.vscode\extensi**\ms-python.python-2018.10.1\pythonFiles\experimental\ptvsd\ptvsd\futures.py", line

40, in result

reraise(self._exc_info)

File "c:\Users\lz\.vscode\extensi**\ms-python.python-2018.10.1\pythonFiles\experimental\ptvsd\ptvsd\reraise3.py", line 8, in reraise

raise exc_info[1].with_traceback(exc_info[2])

File "c:\Users\lz\.vscode\extensi**\ms-python.python-2018.10.1\pythonFiles\experimental\ptvsd\ptvsd\futures.py", line

149, in callback

x = next(it)

File "c:\Users\lz\.vscode\extensi**\ms-python.python-2018.10.1\pythonFiles\experimental\ptvsd\ptvsd\wrapper.py", line

1958, in on_evaluate

pyd_tid, pyd_fid = self.frame_map.to_pydevd(vsc_fid)

File "c:\Users\lz\.vscode\extensi**\ms-python.python-2018.10.1\pythonFiles\experimental\ptvsd\ptvsd\wrapper.py", line

283, in to_pydevd

return self._vscode_to_pydevd[vscode_id]

KeyError: 8

源代码为：

# -*- coding: utf-8 -*-
import numpy
import pandas as pd

pd1=pd.read_excel('1.xlsx',sheet_name='Sheet2')
print(type(pd1))
print(pd1)