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Python Expression to Change Field Labels

ShawnGazzano

How is the Python expression written (i.e. what is the syntax?) to change a field's labels from its unique values to custom labels?

The field I'm working with is DISTRICT. Its unique values are 1, 2, 3, 4, and 5.

On my map, I want the districts to be labeled with their supervisors' names, instead of with their numbers.

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ShawnGazzano

Ok, I've got Advanced checked and Python for parser. That validates the expression.

But in the Expression Verification window, the Sample Text String and Sample Label are blank.

When I press OK to get out of Expression Verification / Label Expression / Layer Properties windows, my map updates, but without labels; they are all blank.

The expression I have entered is:

def FindLabel ( [DISTRICT] 😞

if [DISTRICT] == 1:

return "Bob Hope"

IanMurray

Like I said, make sure the advanced box is checked.

It doesn't allow multiple lines of code for simple expressions, so the advanced box needs to be clicked

ShawnGazzano

I entered

def FindLabel ( [District] 😞

if District == 1:

return "Bob Hope"

but the response to clicking the Verify button was "Carriage returns are not allowed in simple expressions."

I took out the extra "=" in front of "1", but the Verify response was the same.

IanMurray

It is pretty simple.

def FindLabel ( [DISTRICT] ):
  if DISTRICT == 1:
    return "Bob Hope" #Input your supervisor name there
  elif DISTRICT == 2:
    return "Bob Costas" #Input your Supervisor name there
  elif DISTRICT == 3:
    return "Bob Marley" #Input your Supervisor name there
  elif DISTRICT == 4:
    return "Bobby Bowden" #Input your Supervisor name there
  elif DISTRICT == 5:
    return "Bob the Clown" #Input your Supervisor name there

Similar to that, just use if/elif statements to evaluate the value of District and return the name you want.

Use Python for parser and advanced expression checked.

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