PdfFileReader(pdfFileObj) # TODO: Loop through all the pages (except the first) and add them. # TODO: Save the resulting PDF to a file. 对于每个 PDF,循环通过调用open()并使用'rb'作为第二个参数,以读取二进制模式打开一个文件名。open()调用返回一个File对象,该对象被传递给PyPDF2.Pdf...
Finally, you start a for loop to iterate over the list of actions and run every action through the player instance. That’s it! Your disk player simulator is ready for a test. To run it, go ahead and execute the following command at your command line: Shell $ python disk_player.py...
Another time you might have seen argument unpacking with aforloop is with the built-inzip(), which allows you to iterate through two or more sequences at the same time. On each iteration,zip()returns a tuple that collects the elements from all the sequences that were passed: ...
asyncio.create_task():将coroutine对象转换为task对象,并且将task对象注入event_loop事件循环 asyncio.gather():将task对象封装到为future对象进行await,返回值也按顺序封装成列表一起返回,从而避免了task对象一个一个的await,可以直接传入coroutine对象,gather方法会自动将coroutine对象封装为task并加入event_loop asyncio....
(epoch < 500): self.k = 9 # Loop over all batches for i in range(total_batches): self.X_train = next(batch_gen) # Run the weight update #batch_xs = (batch_xs > 0)*1 _ = sess.run([self.updt],feed_dict={self.x:self.X_train}) # Display the running step if epoch % ...
REPL为Read-Evaluate-Print-Loop的所写,即通过一个交互界面接受输入并回显结果 词法分析 词法分析方法 词法分析的任务就是:输入字符串,输出Token串,词法分析在英文中一般叫做Tokenizer 具体实现:有个计算模型,叫做有限自动机(Finite-state Automaton,FSA),或者叫做有限状态自动机(Finite-state Machine,FSM) 有限自动机它...
for n in range(2, 10): for x in range(2, n): if n % x == 0: print( n, 'equals', x, '*', n/x) break else: # loop fell through without finding a factor print(n, 'is a prime number') 1. 2. 3. 4. 5. 6. 7. 8. 24、使用C扩展 CPython还为开发者实现了一个有趣...
case0:/* Fallthrough */ why = do_raise(w, v, u); break; default: PyErr_SetString(PyExc_SystemError, "bad RAISE_VARARGS oparg"); why = WHY_EXCEPTION; break; } break; 这里RAISE_VARARGS指令的参数是1,所以直接将异常对象取出赋值给w,然后调用do_raise函数。在do_raise中,最终将调用之前剖析...
engine) # all functions below are divided into functionality categories # note how all functions are defined with async - hence can use await AND needs to # be awaited on their own async def create(): # Create some records to work with through QuerySet.create method. # Note that query...
break using a loop to retrieve the object status, with the get method, ensures that the status attribute is updated. 2.6.4. using update methods these service methods update existing objects. they receive an instance of the relevant type describing the update to perform, send the request ...