addInputField输入的参数到底哪里出错了？

[wenhuizhan]

import arcpy 

in_shp= r"D:\dr\ds\gc\TJDL.shp"
out_shp= r"D:\dr\fs"
in_gdb= r"D:\dr\CS.gdb\NTFHYSTHJBC"
ysgx=arcpy.FieldMappings 
ly_type=arcpy.FieldMap 
md_type=arcpy.FieldMap 
for shp_field in arcpy.ListFields(in_shp):     
    ly_type.addInputField(in_shp,shp_field.name)
执行结果提示：应为类型'FieldMap'，但实际为'str'我查了官方说明是“str”类型没错。

addInputField (table_dataset, field_name, {start_position}, {end_position})
但打开原文件看是这个

def addInputField(self, *args):
    from ..geoprocessing._base import gp_fixargs
    return convertArcObjectToPythonObject(self._arc_object.AddInputField(*gp_fixargs(args)))

是哪里出问题了？

[DanPatterson]

FieldMappings—ArcGIS Pro | Documentation

see the code example in the link

ly_type=arcpy.FieldMap() 
md_type=arcpy.FieldMap()
ysgx=arcpy.FieldMappings()

[wenhuizhan]

刚学的小白，看了你发的链接的说明，但自己在测试的时候，报错了，比如

in_shp= r"D:\dr\ds\gc\TJDL.shp"
out_shp= r"D:\dr\fs"

in_shp= r"D:\dr\ds\gc\TJDL.shp"
out_shp= r"D:\dr\fs"
ly_type=arcpy.FieldMap() 
ly_type.addInputField(in_shp, tree_type)
ly_type.addInputField(out_shp, plant_type)#执行到这一句就报错，我在两个图层都建了tree_type和plant_type两个字段，类型text。我想不明白，为什么上一句不报错，下一句就报错。

[DanPatterson]

I can't tell from your code.  but out_shp is not a featureclass in a geodatabase for sure and if it is supposed to be a shape file then it should read

out_shp= r"D:\dr\fs.shp"