convert VB expression to python

[Anonymous User]

I am new to python.  I am using a model to automate a data update process.  Part of the model is to calculate a new field by concatenating 3 other fields and left trimming to remove white space as needed.  Below is the VB expression.  When I use python to automatically run this model it fails at the expression to calculate the field.   Below is the VB expression.  I cannot find an example of how this would look as a python expression.  Can anyone help?

FullStreet =

LTrim( [LOCN] &" " &  LTrim( [LOCD] & " " &  [LOCS]))

Any help would be greatly appreciated.

Sincerely,

Nita L Hester

[RandyBurton]

Assuming all fields are TEXT, this might work (note the space between the double quotes in line 2):

def processInput(input1, input2, input3):
    return " ".join([str(i).strip() for i in [ !input1!, !input2!, !input3!] if i]).strip()
# you can also tack on .replace("  "," ") after the last .strip() to remove double spaces if needed

[Anonymous User]

That worked!!!!!!!!!!

Thanks so much everyone for your assistance and thanks for your patience with a beginner.

Sincerely,

Nita

[RandyBurton]

Glad it worked.  It was a group effort.  Check out Some Python Snippets​. It will help you with learning Python.

[Anonymous User]

Thanks for the info, I appreciate it.