I migrated from 3.6.6 to 3.7.
Error during command: pipenv lock (environment was created before successfully):
LOG:
PS C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python\repos\DjangoPollsNew> pipenv lock
Locking [dev-packages] dependencies...
Locking [packages] dependencies...
ser\appdata\local\programs\python\python37\lib\site-packages\pipenv\vendor\click\core.py", line 8, in <module>
    from .types import convert_type, IntRange, BOOL
  File "c:\users\user\appdata\local\programs\python\python37\lib\site-packages\pipenv\vendor\click\types.py", line 4, in <module>
    from ._compat import open_stream, text_type, filename_to_ui, \
  File "c:\users\user\appdata\local\programs\python\python37\lib\site-packages\pipenv\vendor\click\_compat.py", line 536, in <module>
    from ._winconsole import _get_windows_console_stream
  File "c:\users\user\appdata\local\programs\python\python37\lib\site-packages\pipenv\vendor\click\_winconsole.py", line 16, in <module>
    import ctypes
  File "C:\Users\User\AppData\Local\Programs\Python\Python37\Lib\ctypes\__init__.py", line 7, in <module>
    from _ctypes import Union, Structure, Array
ModuleNotFoundError: No module named '_ctypes'

What can I do?
I need to create new Pipfile.lock for heroku hosting.
Thanks in advance))

Since you are using pipenv and it is not part of the Python standard library, you should check the pipenv issue tracker and documentation and, if necessary, ask there:

https://github.com/pypa/pipenv/issues