Just an additional comment to put in my two cents.
When the list of possibilities gets a bit long you can use dictionaries: See the example below:
def Reclass(story_height):
dct = {"1A": "1.25", "1H": "1.50", "1T": "1.75",
"2A": "2.25", "2H": "2.50", "2T": "2.75",
"3A": "3.25", "3H": "3.50", "3T": "3.75"}
if story_height in dct:
return dct[story_height]
else:
return story_height
This allows you to search for a key in the dictionary and if it exists it will return the corresponding value.
Since I notice that there is a logic in the values returned, in this case you could also do this:
def Reclass2(story_height):
dct = {"A": ".25", "H": ".50", "T": ".75"}
result = story_height
if len(story_height) == 2:
if story_height[1] in dct:
result = story_height[0] + dct[story_height[1]]
return result
The A, H and T value represent the value (ok, text) behind the decimal and just put the first character in front of it.
When you run it (as shown below in a snippet of Python, not the Field Calculator) you can see the result:
def main():
lst_story_height = ["2H", "3T", "1A", "4H", "5A", "6T"]
print "\nOriginal methode: Reclass:"
for story_height in lst_story_height:
print story_height, Reclass(story_height)
print "\nAlternative methode: Reclass2:"
for story_height in lst_story_height:
print story_height, Reclass2(story_height)
def Reclass(story_height):
dct = {"1A": "1.25", "1H": "1.50", "1T": "1.75",
"2A": "2.25", "2H": "2.50", "2T": "2.75",
"3A": "3.25", "3H": "3.50", "3T": "3.75"}
if story_height in dct:
return dct[story_height]
else:
return story_height
def Reclass2(story_height):
dct = {"A": ".25", "H": ".50", "T": ".75"}
result = story_height
if len(story_height) == 2:
if story_height[1] in dct:
result = story_height[0] + dct[story_height[1]]
return result
if __name__ == '__main__':
main()
This will yield:
Original methode: Reclass:
2H 2.50
3T 3.75
1A 1.25
4H 4H
5A 5A
6T 6T
Alternative methode: Reclass2:
2H 2.50
3T 3.75
1A 1.25
4H 4.50
5A 5.25
6T 6.75
AS you can see, I created a field *_Copy. when I run the script above, it works till the 'IF' is false. Then it updates to null. I want it to leave what is already there 1, or 2, or what ever else is their. 
