在Python中,if/else和case语句(在Python中通常使用字典映射或match语句来实现类似功能)是控制流程的重要部分。以下是关于这两种语句的基础概念、优势、类型、应用场景以及常见问题的解答。 基础概念 if/else语句: if/else语句用于根据条件执行不同的代码块。
nmap 检测扫描端口,shell elif then else 用法 --- ${statusP}" if [[ $statusP = "open" ]]; then echo "端口---> $i 通畅" elif...[[ $statusP = "closed" ]]; then echo "端口: $i 开放,没有服务运行该端口" else echo "端口没开放...--- ${statusP}" if [[ $statusP = "op...
Python-if-elif-else语句 Source: #!/bin/env python # coding=gb2312 # -*- coding: gb2312 -*- from __future__ import division ### if-else ### print '### if-else ###' a = input("a: ") # 12 or 10+2 b = input("b: ") if(a>b): print "max: ", a else: print "m...
If multiple elif conditions become True, then the first elif block will be executed. The following example demonstrates if, elif, and else conditions. Example: if-elif-else Conditions Copy price = 50 if price > 100: print("price is greater than 100") elif price == 100: print("price...
If you want to print variable, then useechocommand. In front of the variable to add$variabelor use${variable}to fetch the value of variable. #echo$variable #echo$PATH 2 if...then ifconditionthencondition is true execute all commands up to else statementelseif condition is not true then...
In pseudocode, the structure of an if then conditional follows the pattern below: if (boolean expression) then clause end if An if then conditional can be extended using the else option to form an if then else statement. There is no conditional expression associated with the else component....
If test_expression1 evaluates to False, then test_expression2 is evaluated. If test_expression2 is True, code block 2 is executed. If test_expression2 is False, code block 3 is executed. Example: R if...else if...else Statement x <- 0 # check if x is positive or negative or ze...
If row[0] has a null value, then I want the script to return nothing. Basically if there is no node name, then we don't need a circuit ID for that node. I ran the following samples and got different errors with each: for row in cursor: if (row[0] != None): if (numIDs =...
Life is full of conditional statements. If your homework is done you can go out and play, else you’re in trouble young man! If its good weather we’re going to the beach today, else if it’s raining we’re staying home. In fact, we based most of our choices on if then else st...
@echo off if exist C:\set2.txt echo "File exists" if exist C:\set3.txt (echo "File exists") else (echo "File does not exist") OutputLets assume that there is a file called set2.txt in the C drive and that there is no file called set3.txt. Then, following will be ...