Replacing Multiple Fields using Python in Field Calculator

[MatthewElbert1]

I am attempting to take multiple field attributes with a specific classification/moniker (in this case-- any attribute field containing a value with SAS-06-xxxxx), and replace them with classification more in line with the rest of the attributes (Ascending sequential values up from SAS-02-05700 as a starting point).  What would the python syntax look like in the code block using Field Calculator.  Novice with Python, so any help/feedback is appreciated.  Thx.

[JohannesLindner · Accepted solution]

Select the unwanted rows with Select Layer By Attribute or with a definition query

Use this with Calculate Field (This changes the data, make a backup!)

# ID =
next_sas_02_sequence()

# Code Block
sas_counter = 5700

def next_sas_02_sequence():
    global sas_counter
    sas_02_sequence = f"SAS-02-{sas_counter:05}"
    sas_counter += 1
    return sas_02_sequence

[MatthewElbert1]

Thanks Johannes, this was very easy to follow and navigate.  I tested on a dummy set first, and it worked!  Much appreciated with the feedback and screenshots. You just reinforced my belief I need to brush up/build on my Python skills. Cheers!