2
You must navigate to your default install location for 3.6. For IDLE 32 bits it's:
C:Users<username>AppDataLocalProgramsPythonPython36-32Scripts
for IDLE 64 bits use:
C:Users<username>AppDataLocalProgramsPythonPython36Scripts
If you navigate to that directory in the command prompt (use cd command), then the command
pip install pyperclip
should work.