Python流程控制中的while循环,直到表达式变为假才会结束。表达的是一个逻辑表达式,必须返回一个true或false 语法如下: while expression: statement(s) #请注意while循环也是要遵循代码缩进原则的 while后接true条件: print '' #始终为true,会进入死循环,一直print打印。。,没有实际意义。。 那么,我们在设计Python程...
As we know that else can be used with if statement in Python and other programming languages (like C, C++, Java, etc). Python else with for/whileIn Python, we can use else with for/while to determine whether for/while loop is terminated by a break statement or not i.e. else ...
Python: while and else statementThere is a structural similarity between while and else statement. Both have a block of statement(s) which is only executed when the condition is true. The difference is that block belongs to if statement executes once whereas block belongs to while statement exec...
def for_statement(self): # 添加循环控制语句FOR节点的方法 self.eat(TokenType.FOR) # 验证FOR start_node = self.assignment_statement() # 循环开始节点是一个ASSIGN节点 self.eat(TokenType.TO) # 验证TO end_node = self.expr() # 循环终止节点是一个expr节点 self.eat(TokenType.DO) # 验证DO if...
statement(s) 注意:python使用缩进作为其语句分组的方法,建议使用4个空格 # expression 表示条件表达式(比如:a>b) # statement 表示要执行的代码 1. 2. 3. 4. 5. 6. 多分支 多分支有分为两种情况: 1、如果怎么样,就怎么样,否则,怎么样。(if、else) ...
Python lets you add anelsepart to your loops. This is similar to usingelsewith anifstatement. It lets you specify what to do when/if the loop condition becomes false. xxxxxxxxxx counter=1 while(counter<10): print(counter) counter=counter+1 ...
The while statement Computers are often used to automate repetitive tasks. Repeating identical or similar tasks without making errors is something that computers do well and people do poorly. Iteration is so common, Python provides several language features to make it easier. One is the for ...
breakis an excellent way of controlling your scripts, hence why it's called a control statement. It terminates whichever loop it's placed within, causing Python to resume whatever line of code comes after the loop. For situations that make use of nested loops,breakwill only terminate the inne...
The above program is equivalent to: age =32# the test condition is always TruewhileTrue:print('You can vote') Run Code More on Python while Loop Pythonwhileloop withbreakstatement We can use abreak statementinside awhileloop to terminate the loop immediately without checking the test condition...
while语句的形式: while( expression ) statement for语句的形式: for( expression1; expression2;expression3 ) // ( 初始化,条件,调整 ) statement break语句在for语句和while语句中的作用都是:永久终止其循环;而con... 关于while和do while的区别。简单易懂。