PYTHON-arcgis的开发：批量操作字段_arcpy.calculatefield_management 全部换成变量

#添加arcpy包，这个步骤必不可少
import arcpy
... from arcpy import env
... env.workspace = "D:/资料集/123.gdb"
##########################################################################
... fcList = arcpy.ListFeatureClasses()
... for sf in fcList:
##########################################################################
...     arcpy.AddField_management(sf, "date", "TEXT", 9, "", "", "发震日期", "NULLABLE", "NON_REQUIRED")
...     arcpy.AddField_management(sf, "time", "TEXT", 9, "", "", "发震时刻", "NULLABLE", "NON_REQUIRED")
...     arcpy.AddField_management(sf, "name", "TEXT", 18, "", "", "地震名称", "NULLABLE", "NON_REQUIRED")
...     arcpy.AddField_management(sf, "major_axis", "LONG", 9, "", "", "长轴长度", "NULLABLE", "NON_REQUIRED")
...     arcpy.AddField_management(sf, "minor_axis", "LONG", 9, "", "", "短轴长度", "NULLABLE", "NON_REQUIRED")
...     arcpy.AddField_management(sf, "direction", "TEXT", 9, "", "", "长轴方向", "NULLABLE", "NON_REQUIRED")
...     arcpy.AddField_management(sf, "epicenter", "TEXT", 9, "", "", "烈度",