我具有已构建的此功能，似乎我在这里遗漏了一些非常小的东西。由于某些原因，此循环不会调用。缩进看起来不错，我的输出没有任何错误，但是数据没有更新，您可以通过我未在终端中显示的调试打印语句来查看该数据。

下面是我要说的功能：

def updatefield(layer,prev_data):
print("DEUBG:: UPDATE FIELD")
fname,ftype,fdict = field_attr(prev_data)[0],field_attr(prev_data)[1],field_attr(prev_data)[2]

arcpy.AddField_management(
    in_table=layer,field_name=fname,field_type=ftype,field_is_nullable="NULLABLE"
    )

# Use UpdateCursor to expedite the copy of the data to the new field.
with arcpy.da.UpdateCursor(layer,[prev_data,fname,"OID@"]) as uc:
    print("DEUBG:: UPDATE CURSOR: {}".format(layer))
    for record in uc:
        print("\tDEBUG:: record: {}".format(record)) # THIS NEVER GETS CALLED 
        if record[0] in fdict.keys():
            record[1] = fdict[record[0]]
        else:
            if layer == fms_conduit:
                record[1] = None
            # Can't recall if you can have empty keys...These also pretty much only apply to fiber.
            elif prev_data == "CATEGORY" and record[0] == "":
                record[1] = "OTH"
            elif prev_data == "CABLECAPACITY" and (record[0] in ('',' ',None)):
                record[1] = 0
            elif prev_data == "CABLECAPACITY":
                record[1] = int(record[0])
            else:
                record[1] = ""
        print("\nDEBUG:: OID: {}\tPrevField: {}\t NewFieldName: {}\tNewFieldValue: {}".format(
            record[2],prev_data,record[1])
        )
        uc.updateRow(record)

这是输出：

最后几个调试打印语句来自另一个函数，但是我应该打印该记录。再说一次，可能有些愚蠢，但我似乎无法理解。

谢谢您的时间。