但是,如果你真的把[User("foo"), Admin("bar_admin")]这样的用户列表传到deactivate_users函数里,程序立马就会抛出RuntimeError异常,因为管理员对象Admin("bar_admin")压根不支持停用操作。 在deactivate_users函数看来,子类Admin无法随意替换父类User使用,所以现在的代码是不符合 L 原则的。 一个简单但错误的解决...
>>> list_b = list_a >>> list_c = list_a[:] >>> list_d = list_a.copy() >>> >>> list_a.append(6) >>> list_b.remove(3) >>> list_c.pop() 5 >>> list_d.insert(4,'d') >>> for list in [list_a,list_b,list_c,list_d]: print(list) [1, 2, 4, 5, 6] ...
The silly panda walked to the chandelier and then screamed. A nearby pickup truck was unaffected by these events. 1. 结果应该打印到屏幕上并保存到一个新的文本文件中。 #! python3 # madLibs.py - Reads in text files and lets the user add their own text anywhere # the word ADJECTIVE, NOU...
Write a Python program to print the number of elements present in an array In Python, arrays can be handled using built-in data types like a list or with an ‘array’ module. The task is simple: we want to create a Python program that prints out the number of elements present in an ...
Python Create and Open a File Python has an in-built function called open() to open a file. It takes a minimum of one argument as mentioned in the below syntax. The open method returns a file object which is used to access the write, read and other in-built methods. ...
In this challenge, a vulnerable function has been added to the kernel: Thearg3_typeofbpf_aliyunctf_xor_protohas been wrongly set withMEM_RDONLY, so we can abuse it and gain ability to modify read-only maps. And incheck_mem_access(): ...
13. Gradient Color on All Values Create a dataframe of ten rows, four columns with random values. Write a Pandas program to make a gradient color on all the values of the said dataframe. Sample Solution: Python Code : importpandasaspdimportnumpyasnpimportseabornassns ...
问pymongo.errors.BulkWriteError:发生批操作错误(MongoDB 3.4.2，pymongo 3.4.0，python 2.7.13)...
可以通过竞争 /flag 与 /about 获取到 FLAG ,有多种并发方式,以下提供一种使用 python 的执行并发的方式,仅供参考,后续会提供详细分析的 writeup放在评论区 importasyncioimportaiohttpasyncdefsend_request(session,url):whileTrue:asyncwithsession.get(url)asresp:text=awaitresp.text()if"aliyunctf"intext:prin...
doc.save(filename_or_stream, self.get_biff_data()) File "/usr/local/lib/python3.6/dist-packages/xlwt/CompoundDoc.py", line 262, in save f = open(file_name_or_filelike_obj, 'w+b') PermissionError: [Errno 13] Permission denied: 'Produits dangereux Excel.xls' 0...