KeyError caused by unsupported string formatting Py3

[Technical Manager]

Recommend: use "{C} {P}".format( C=C, P=P)

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Python 3.6.6 |Anaconda, Inc.| (default, Jun 28 2018, 11:27:44) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.

import archook
archook.get_arcpy(pro=True)
Traceback (most recent call last):
File "", line 1, in
File "C:\Users\jesegal\AppData\Local\ESRI\conda\envs\arcgispro-py3-clone2\lib\site-packages\archook\archook.py", line 158, in get_arcpy
winpaths, syspaths = get_pro_paths()
File "C:\Users\jesegal\AppData\Local\ESRI\conda\envs\arcgispro-py3-clone2\lib\site-packages\archook\archook.py", line 122, in get_pro_paths
C, P
KeyError: 'C'

[Matt Wilkie]

Thank you! I was pulling hairs trying to satisfy both python 2 and 3. (Earlier version used f-strings).