ArcGIS Pro - Python If-Elif-Else in field calculator

Question

I am trying to populate a field with a text string based on a combination of two other fields. The field !yearsSinceAct! is a decimal (float) of years. !OperationalStatus! is a text field describing whether or not a particular feature is operable or not. The three options for !OperationalStatus! are "OK", "Inoperable", and null

actionRating =
Reclass(!yearsSinceAct!,!OperationalStatus!)

def Reclass(Rating,Operation):
 if (Rating <= 1) and (Operation = "OK"):
 return "Recently operated or serviced"
 elif (1 < Rating <= 5) and (Operation = "OK"):
 return "Operated or serviced between 1 and 5 years ago"
 elif (Rating > 5) and (Operation = "OK"):
 return "Last known to be OK but no promises; it's been a minute"
 elif (Rating <= 1) and (Operation = "Inoperable"):
 return "Recently found to be non-functioning"
 elif (1 < Rating <= 5) and (Operation = "Inoperable"):
 return "Found to be dysfunctional and has not been repaired in 1-5 years"
 elif (Rating > 5) and (Operation = "Inoperable"):
 return "This valve has been left in the dust"
 else:
 return "Unknown"

I can't get this code block to work. I tried assigning the outputs to a variable and then returning that variable at the end too with no success. Any ideas?

Answer 1

According to Comparisons - Built-in Types - Python 3.x documentation:

This table summarizes the comparison operations:

Operation	Meaning
<	strictly less than
<=	less than or equal
>	strictly greater than
>=	greater than or equal
==	equal
!=	not equal
is	object identity
is not	negated object identity

The existing code is using a single equals sign, which is an assignment statement. What is needed is two equal signs, which is an equality comparison.