语言的语法很简单，只包含几个关键词和标准布尔操作符。Boolean operator 【计算机】布尔算子 布尔操作符，逻辑算子几乎所有的搜索引擎都将布尔逻辑操作符作为最基本的语法规则。一般布尔逻辑操作符包括AND，OR，NOT， NEAR，BEFORE，AFTER和括号等。其中最基本的是AND，OR，NOT和NEAR楼上的能不能少占点位...
| (Boolean Or) example 2 (stand-alone script) This sample performs a Boolean Or operation on two input rasters. # Name: Op_BooleanOr_Ex_02.py # Description: Performs a Boolean Or operation on the cell values of # two input rasters # Requirements: Spatial Analyst Extension # Import sy...
The | operator will perform a Boolean Or operation when one or more input (operand) is a raster. If both inputs (operands) are numbers then the | operator will perform a Bitwise Or operation. For more information on how to work with operators, refer to Working with operators. When there...
Example 2–12 Using theBoolean Operator The following examples show how<or>is used and the results:
BooleanOr example 2 (stand-alone script) This example performs a Boolean Or operation on two Grid rasters. # Name: BooleanOr_Ex_02.py# Description: Performs a Boolean Or operation on the cell values of# two input rasters# Requirements: Spatial Analyst Extension# Import system modulesimportarc...
The result of x || y is true if either x or y evaluates to true. Otherwise, the result is false. If x evaluates to true, y isn't evaluated. In the following example, the right-hand operand of the || operator is a method call, which isn't performed if the left-hand operand ...
The result of x || y is true if either x or y evaluates to true. Otherwise, the result is false. If x evaluates to true, y isn't evaluated. In the following example, the right-hand operand of the || operator is a method call, which isn't performed if the left-hand operand ...
The|operator always evaluates both operands. When the left-hand operand evaluates totrue, the operation result istrueregardless of the value of the right-hand operand. However, even then, the right-hand operand is evaluated. In the following example, the right-hand operand of the|operator...
False or False yields False For example, if x == 100 or y == 200 then the result of the two expressions is true. The only combination that yields a false result is if both expressions are false. Here is the truth table for the! operator:...
(true/false) type queries. In a lot of cases I find that or can be avoided by using within for example and that not can be sometimes avoided by using without but it is still good to know that these operators exist. The and operator can sometimes be avoided by chaining has steps togeth...