field calculator replace zero values with null

replaceZero.cal

# replace all zeros with <Null>, anything else keep the same
def replaceZero(value):
	if value == 0:
		return None
	else:
		return value
__esri_field_calculator_splitter__
replaceZero( !current_richness_Native_Fish!)

replaceZero.py

# replace all zeros with <Null>, anything else keep the same
def replaceZero(value):
	if value == 0:
		return None
	else:
		return value