import arcpy # 定义输入和输出参数 input_fc = arcpy.GetParameterAsText(0) # 输入要素类 output_fc = arcpy.GetParameterAsText(1) # 输出要素类 field_name = arcpy.GetParameterAsText(2) # 筛选字段名称 filter_expression = arcpy.GetParameterAsText(3) # 筛选表达式 # 使用MakeFeatureLayer工具创建要素图层 arcpy.MakeFeatureLayer_management(input_fc, "input_lyr") # 使用SelectLayerByAttribute工具选择要删除的要素 arcpy.SelectLayerByAttribute_management("input_lyr", "NEW_SELECTION", "{} = '{}'".format(field_name, filter_expression)) # 使用DeleteFeatures工具删除选定的要素 arcpy.DeleteFeatures_management("input_lyr") # 使用CopyFeatures工具将剩余的要素复制到输出要素类 arcpy.CopyFeatures_management("input_lyr", output_fc)运行错误：Traceback (most recent call last): File "D:\多对一空间连接\批量删除小面积.py", line 6, in <module> NameError: name 'input_fc' is not defined 执行(删除小面)失败。请改正代码

代码中的问题是变量没有被正确定义。请检查输入参数是否正确连接，并且确保输入参数的名称与代码中的变量名称相同。另外，您还需要保证输入参数的数据类型与代码中要求的数据类型相同。例如，如果某个参数要求输入要素类，则必须将要素类作为该参数的输入。

另外，建议您在代码开头添加注释来说明每个参数的含义和数据类型。这样可以使代码更易于理解和维护。以下是一个示例代码：

# -*- coding: utf-8 -*-
# Description: This script deletes features based on filter expression and exports the remaining features to output feature class
# Parameters:
# 0 - Input Feature Class (Feature Class)
# 1 - Output Feature Class (Feature Class)
# 2 - Filter Field Name (Field)
# 3 - Filter Expression (String)

import arcpy

# Get input parameters
input_fc = arcpy.GetParameterAsText(0) # Input feature class
output_fc = arcpy.GetParameterAsText(1) # Output feature class
field_name = arcpy.GetParameterAsText(2) # Filter field name
filter_expression = arcpy.GetParameterAsText(3) # Filter expression

# Make feature layer from input feature class
arcpy.MakeFeatureLayer_management(input_fc, "input_lyr")

# Select features based on filter expression
arcpy.SelectLayerByAttribute_management("input_lyr", "NEW_SELECTION", "{} = '{}'".format(field_name, filter_expression))

# Delete selected features
arcpy.DeleteFeatures_management("input_lyr")

# Copy remaining features to output feature class
arcpy.CopyFeatures_management("input_lyr", output_fc)