breakkeyword is used inside the loop to break out of the loop. Suppose while iterating over the characters of the string stored in the variablename, you want to break out of it as soon as the character"T"is encountered. This is how it can be done: break关键字在循环内部使用,以脱离循环。
/usr/bin/env pythonforiinrange(3):ifi == 1:break#跳出循环,不执行后面的else语句printielse:print'loop over' $ python pytest.py#执行脚本0 将break改成continue,最终循环也是正常结束的(即循环的判断条件失败时推出的循环),则执行else语句: $ python pytest.py 02loop over 11 迭代器 迭代器为类序列...
foriinrange(1, 5):print(i)else:print('The for loop is over') 输出: $ pythonfor.py1 2 3 4Theforloopisover 它是如何工作的 在这一程序中,我们打印了一个数字序列。我们通过内置的range函数生成这一数字序列。有哪些Python内置函数 在这里我们所要做的事情是提供两个数字,而range将会返回一个数字序...
Since the range() function returns a sequence of numbers, we can iterate over it using a for loop. For example, # iterate from i = 0 to i = 3 for i in range(0, 4): print(i) Run Code Output 0 1 2 3 Here, we used the for loop to iterate over a range from 0 to 3. ...
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3.2.4:for基于range()实现计数循环 3.2.5:for与break,continue,else 3.2.6:for语句小结 一.if语句 1.1 功能 计算机又被称作电脑,意指计算机可以像人脑一样,根据周围环境条件(即expession)的变化做出不同的反应(即执行代码) if语句就是来控制计算机实现这一功能 ...
Iterables can be used in a for loop and in many other places where a sequence is needed (zip(), map(), …). When an iterable object is passed as an argument to the built-in function iter(), it returns an iterator for the object. This iterator is good for one pass over the set...
...另外,range()作为内置方法,是作为C代码执行的,而 i +=1需要解释,在效率和速度之间是差很多的。而且i += 1相当于创建了新对象,相对而言也会更慢。...参考:https://stackoverflow.com/questions/869229/why-is-looping-over-range-in-python-faster-than-using-a-while-loop...
The difference between the xrange() and range() functions While Loop The while loop is one of the first loops that you'll probably encounter when you're starting to learn how to program. It is arguably also one of the most intuitive ones to understand: if you think of the name of th...
[Python]For嵌套循环nested loop-练习 新手可以尝试用Python的For嵌套循环输出如下图形: 难度依次提高,希望老手给指正错误或提出建议。 分享下我写的: 图一: for line in range(1,5): for star in range(1,8): print("*&… 人閑桂花落 编程【Python】while循环结构 编程【Python】点击上面的链接,查看...