ArcGIS和Python

Question

我想把我的注意力集中在ARC的python集成上。但是我们直到下个学期才学会它，但是我认为它适合于满足我对我的项目的需求。(在第一学期做了第二学期的作业)

我试图获取多个条件(低、中、高)并分配一个值。5 = no结果、4 = low等till 0 = not present。

我知道这是在用while循环吗？

IE 
def Condition (field_16,field_8):
     While field_8 == "choice0":    
          if value(or is this field_16) == "choice0"  
               return "5"

等等，有人能给我小费吗？

然后是condition = Condition (!field_16!)

有点被蟒蛇困在弧形上。

谢谢!

Answer 1

通常使用更新游标代替ArcGIS中的字段计算器来更新行值。游标语法通常比字段计算器界面更直观。例如：

import arcpy

fc = r'C:\path\to\your.gdb\feature_class'

with arcpy.da.UpdateCursor(fc, ["some_value_field", "some_field_to_write_values"]) as cursor:
    for row in cursor:
        """
        note that row[0] refers to "some_value_field"
        and row[1] refers to "some_field_to_write_values"
        """
        if row[0] == "low":
            row[1] = 4
        elif row[0] == "no":
            row[1] = 5
        elif row[0] == "not present":
            row[1] = 0
        cursor.updateRow(row)