解决方案：循环体中加入 count += 1。defwhile_loop(): count = while count < 5: print("循环5次！") count += 1while_loop()运行结果：循环5次！循环5次！循环5次！循环5次！循环5次！「示例 2：for循环」deffor_loop(): arr = [1,2]for item in arr: print("无限循环！")...
"banana", "orange"] for fruit in fruits: print(fruit)输出结果为：2、循环（Loop）循环（Loo...
for i in range(2, n+1): ... value *= 1 ... return value ... """ >>> timeit("factorial(4)", setup=setup_string, number=10000000) for loop: 4.367680199000461 # reduce() 函数>>> setup_string = """ ... from functools import reduce ... print("reduce():") ... def factori...
import tkinter as tkimport asyncioasync def update_label():for i in range(10):label.config(text=f"Count: {i}")await asyncio.sleep(1)root = tk.Tk()label = tk.Label(root, text="Count: 0")label.pack()async def main():await update_label()loop = asyncio.get_event_loop()loop.run_...
我认为,从for循环开始的这最后一段代码需要一些解释。for循环遍历 Beautiful Soup 为我们找到的所有链接。然后,linkText将这些链接转换成字符串,这样我们就可以操作它们了。然后我们将链接的主体(链接指向的实际文件或页面)也转换成一个字符串,并检查它是否包含我们正在寻找的文件类型。如果是的话,我们把它附加到站点...
("\n") for command in self.selections: self.count += 1 self.run_process(cmd=command) def on_worker_state_changed(self, event: Worker.StateChanged) -> None: if self.count == 0: button = self.query_one('#close', Button) button.disabled = False self.log(event) @work(exclusive=...
Zipeg / iZip / UnRarX for Mac 7-Zip / PeaZip for Linux 该书的代码包也托管在 GitHub 上,网址为github.com/PacktPublishing/Effective-Python-Penetration-Testing。我们还有其他丰富的图书和视频代码包可供下载,网址为github.com/PacktPublishing/。快去看看吧!
python3 -m timeit 'x=(1,2,3,4,5,6)' 20000000 loops, best of 5: 9.97 nsec per loop python3 -m timeit 'x=[1,2,3,4,5,6]' 5000000 loops, best of 5: 50.1 nsec per loop 但如果是 索引操作 的话,两者的速度差别非常小,几乎可以忽略不计。 代码语言:javascript 代码运行次数:0 运行...
可以做的一个改进是存储对正在使用的特定对象/数组的引用,这样就不必一次又一次地返回Object.keys(...)。 let data = { "version": "2.0", "result": { "0": [418789, 418790, 418791], "1": [431961, 431962, 431963], }};function findWhichArrayContainsValue(val) { for (key in data.result...
fields = [[random.randint(0, 1) for in range(FIELDCOUNT)] for in range(FIELD_COUNT)] # 初始化雷区,0表示空格,1表示地雷while True:for event in pygame.event.get():if event.type == pygame.QUIT: # 如果玩家关闭了窗口,则退出游戏循环pygame.quit()exit()if event.type == pygame.MOUSEBUTTON...