You're trying to assign a function call 'nums.append(x)' which has a 'None' value to the variable 'nums'. Therefore you can't apply the 'append'-method to a None-value.
You should just apply the append-method to your list instead:
nums = 
for i in strList:
I've downloaded the file "qt-unified-windows-x86-3.0.0-online.exe" and installed Qt and I've also downloaded and unpacked the file "PyQt5_gpl-5.9.zip". I'm using Python 3.6 but I can't figure out where to drop the ...