arcgis desktop - Reclass Using Field Calculator in ArcMap

I'm trying to reclass 3000, 2000, 1000 and 0.5 into 1, 2, 3 and 4 respectively in a new field using field calculator. However it keeps returning an error message and I can't figure out why, any ideas?

def Reclass( !BUFF_DIST! ):
    if !BUFF_DIST! = 3000:
        return 1
    else if (!BUFF_DIST!) = 2000:
        return 2
    else if (!BUFF_DIST!) = 2000:

        return 3
    else: 
        return 4

Answer

Use Python parser and call the function with the actual field name enclosed in !!. BUFF_DIST=

Reclass(!BUFF_DIST!)

When you define the function use whatever name you want, for example buffdist. Also change = to == and else if to elif. Pre-Logic script code:

def Reclass( buffdist ):
    if buffdist == 3000:

        return 1
    elif buffdist == 2000:
        return 2
    elif buffdist == 1000:
        return 3
    else: 
        return 4