python新手求助

Windows 系统下powershell，python3.6.8,无法使用pip,ensurepip, 全部安装过，加入过path。确定是在系统环境下。
运行了get-pip.py
出错信息如下
PS C:\Users\Lily\desktop\python\scripts> .\pip --version
Traceback (most recent call last):  
File "runpy.py", line 193, in _run_module_as_main  
File "runpy.py", line 85, in _run_code
File "C:\Users\Lily\desktop\python\scripts\pip.exe\__main__.py", line 5,
in <module>ModuleNotFoundError: No module named 'pip'
PS C:\Users\Lily\desktop\python\scripts> python -m ensurepip
C:\Users\Lily\Desktop\python\python.exe: No module named ensurepip
求解答~非常感谢~

3.6下没有pip吗  
2.7下默认是有pip的

PS C:\python27\scripts> .\pip --version
pip 9.0.3 from c:\python27\lib\site-packages (python 2.7)