C:\WINDOWS\system32>pip install pyyaml Collecting pyyaml Using cached PyYAML-3.12.tar.gz Building wheels for collected packages: pyyaml Running setup.py bdist_wheel for pyyaml ... error Failed building wheel for pyyaml Running setup.py clean for pyyaml Failed to build pyyaml Installing collected packages: pyyaml Running setup.py install for pyyaml ... error Exception: Traceback (most recent call last): File "c:\program files (x86)\python36-32\lib\site-packages\pip\compat\__init__.py", line 73, in console_to_str return s.decode(sys.__stdout__.encoding) UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8d in position 68: invalid start byte During handling of the above exception, another exception occurred: Traceback (most recent call last): File "c:\program files (x86)\python36-32\lib\site-packages\pip\basecommand.py", line 215, in main status = self.run(options, args) File "c:\program files (x86)\python36-32\lib\site-packages\pip\commands\install.py", line 342, in run prefix=options.prefix_path, File "c:\program files (x86)\python36-32\lib\site-packages\pip\req\req_set.py", line 784, in install **kwargs File "c:\program files (x86)\python36-32\lib\site-packages\pip\req\req_install.py", line 878, in install spinner=spinner, File "c:\program files (x86)\python36-32\lib\site-packages\pip\utils\__init__.py", line 676, in call_subprocess line = console_to_str(proc.stdout.readline()) File "c:\program files (x86)\python36-32\lib\site-packages\pip\compat\__init__.py", line 75, in console_to_str return s.decode('utf_8') UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8d in position 68: invalid start byte