Coding Select Polygon and Make New Layer

Question

I have a large grid file, and I am looking to extract each individual polygon that makes up the grid into a new layer. Essentially, I would like to replicate selecting a layer by mouse click, then "Create Layer from Selected Features".

I am familiar with coding in ArcPy and the Python environment as a whole, I suspect the best approach is to script this process there. My grid table does have each cell attached to a unique number, should this prove useful.

I've written the following code to attempt this:

import arcpy
import sys 
from arcpy import env
from arcpy.sa import *

# Set environment settings
env.workspace = "C:/Users/Eric/Documents/"

#Set Local Variables
in_grid = "fishnet_clipped.shp"
out_feature = "polygrid2.shp"
where_clause = ' "FID" = \'2\' '

# Executing Select
arcpy.Select_analysis(in_grid, out_feature, where_clause)

Answer 1

As I said in my comment I would start a search cursor to get each FID then use that value to export each feature.. As the input is a shapefile you could use the count of features and make a range but it's better not to count on that as next time the input could be a geodatabase feature class where OIDs are not contiguous.

import arcpy
import sys 
from arcpy import env
# from arcpy.sa import * # not needed

# Set environment settings
env.workspace = "C:/Users/Eric/Documents/"

# assuming we're starting in ArcMap
mxd = arcpy.mapping.MapDocument("Current") # reference the current map document
df  = arcpy.mapping.ListDataFrames(mxd)[0] # get the first data frame

#Set Local Variables
in_grid = "fishnet_clipped.shp"
sym_lyr = "make your layer file or map layer and symbolize" # template layer

with arcpy.da.SearchCursor(in_grid,'FID') as sCur:
    for row in sCur:
        out_feature  = "polygrid{}.shp".format(row[0]) # put the FID into the name
        where_clause = "FID = {}".format(row[0])       # put the FID into the where clause
        # Executing Select
        arcpy.Select_analysis(in_grid, out_feature, where_clause)
        arcpy.MakeFeatureLayer_management(out_feature,"FID_{}".format(row[0]))    # make a new layer
        arcpy.mapping.AddLayer(df,"FID_{}".format(row[0]))                        # add it to the map
        arcpy.ApplySymbologyFromLayer_management("FID_{}".format(row[0]),sym_lyr) # symbolize from template layer

arcpy.RefreshTOC()       # prompt to update the TOC (table of contents)
arcpy.RefreshActiveView()# and active view (map)

This code assumes you're running it from ArcMap and will add each exported feature class as a layer as it is created. If you do not wish to symbolize the layer the same as another layer then comment out or remove the apply symbology line.