【单选题】import time scale = 10 print("------执行开始------") for i in range(scale+1): a = '*' * i b = '.' * (scale - i) c = (i/scale)*100 print("{:^3.0f}%[{}->{}]".format(c,a,b)) time.sleep(0.1) print("------执行结束...
【判断题】import threadingimport timelock=threading._RLock()words=["a","b","d","b","p","m","e","f","b"]def increase(): global words for count in range(5): lock.acquire() print("A acquired") for i in ...
【简答题】8小巧面精致的第三方进度条工具库。tqdm 是一个快速、书展性强的进度条工具库,tqdm是一个第三方库, 首先需要安装,然后才能使用。本书8.6 节将详细介绍第三方库的安装方法。请读者提前参考阅读。运行如下程序,观察运行结果。 from tqdm import tqdm from time import sleep for i in tqdm (range (1, 100)): sleep(0.0...
【简答题】Under CMR convention, the carrier is responsible for loss of or damage to the goods occurring between the time he takes over the goods and the time of delivery as well as for any delay in delivery. ( ...