# Import system modules
import arcpy
import os


# Set local variables
datasource = r"C:/Alexsomeplace"
inTable = os.path.join(datasource, "Murray Sp2.shp")
fieldName = "DipDir"
fidField = arcpy.AddFieldDelimiters(datasource, "FID")

def Strike(shape, fid):

    degreeBearing = 55

    arcpy.MakeFeatureLayer_management(inTable, 'shapelyr', "{0} = {1}".format(fidField, fid))

    arcpy.Delete_management('shapelyr')
    #returns the degreebearing value as the dip direction
    return degreeBearing

with arcpy.da.UpdateCursor(inTable, ['SHAPE@', 'FID', fieldName]) as cursor:
    for row in cursor:
        row[2] = Strike( row[0], row[1])
        cursor.updateRow(row)
    del cursor

arcpy.MakeFeatureLayer_management(inTable, 'shapelyr')

def Strike(shape, fid):

    degreeBearing = 55

    arcpy.SelectLayerByAttribute_management('shapelyr', 'NEW_SELECTION', "{0} = {1}".format("FID", fid))

    arcpy.Delete_management('shapelyr')

    #returns the degreebearing value as the dip direction
    return degreeBearing


with arcpy.da.UpdateCursor(inTable, ['SHAPE@', 'FID', fieldName]) as cursor:
    for row in cursor:
        row[2] = Strike( row[0], row[1])
        cursor.updateRow(row)