How to insert a space between camel case, lest I ever forget again

alterCamelCaseAlias.py

#
# @date 05/10/2017
# @author Cindy Jayakumar
#
# Change the alias of feature classes to the 
# title case version of the CamelCase name
#
# e.g. WaterPumpStation => Water Pump Station

import arcpy
import re

gdb = r"C:\Some\Arb\Folder\test.gdb"

def alterFCAlias(name):
  return re.sub(r"\B([A-Z])", r" \1", name)

for root, _, fcs in arcpy.da.Walk(gdb):
  for fc in fcs:
    alias = alterFCAlias(fc)
    arcpy.AlterAliasName(fc, alias )
    print("{0} => {1}".format(fc, alias))

insertSpaceBetweenCamelCase.py

# @credit https://stackoverflow.com/a/199215

import re

text = "ThisIsATest"
re.sub(r"\B([A-Z])", r" \1", text)