statement(s) condition是一个布尔表达式,在每次循环开始前,Python 会检查condition的值。 如果condition的值为True,则执行while代码块中的语句;执行完代码块后,会再次检查condition的值,若仍为True,则继续循环,直到condition变为False时,循环终止。 扩展与深度详解 在Python 中,布尔表达式的灵活性使得while循环可以处理...
If a break statement executes in first program block and terminates the loop then the else clause does not execute. In the following example, while loop calculates the sum of the integers from 0 to 9 and after completing the loop, else statement executes. x = 0; s = 0 while (x < 10...
Example Exit the loop when i is 3: i =1 whilei <6: print(i) ifi ==3: break i +=1 Try it Yourself » ADVERTISEMENT The continue Statement With thecontinuestatement we can stop the current iteration, and continue with the next: ...
解决方案:1...my_subscription_id', queue_name='my_queue', endpoint_uri='http://example.com/my_endpoint')# 等待消息while...delete_statement = 'DELETE FROM my_table WHERE id > 0' cursor.execute(delete_statement) # 等待 5 秒后重新开始循环...使用消息队列:消息队列是一种在应用程序之间传递...
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 ...
More on Python while Loop Pythonwhileloop withbreakstatement We can use abreak statementinside awhileloop to terminate the loop immediately without checking the test condition. For example, whileTrue: user_input =input('Enter your name: ')# terminate the loop when user enters endifuser_input =...
In Python, a basic while loop looks like this: while[a conditionisTrue]: [do something] The condition we provide to the while statement is the controlling expression, our loop will run until the controlling statement is no longer true. ...
Consider the following example, which takes user input in a loop: Python >>>whileTrue:...number=int(input("Enter a positive number: "))...print(number)...ifnotnumber>0:...break...Enter a positive number: 11Enter a positive number: 44Enter a positive number: -1-1 ...
Example 1: while Loop using System; namespace Loop { class WhileLoop { public static void Main(string[] args) { int i=1; while (i<=5) { Console.WriteLine("C# For Loop: Iteration {0}", i); i++; } } } } When we run the program, the output will be: C# For Loop: Iterati...
def while_statement(self): # 添加循环控制语句FOR节点的方法 self.eat(TokenType.WHILE) condition = self.expr() # 获取条件语句表达式节点(是一个BINOP表达式) self.eat(TokenType.DO) # 验证DO if self.current_token.type == TokenType.BEGIN: # 如果遇到BEGIN,说明是BLOCK结构 do_root = self.block...