while-loop

问题 I am trying to loop the switch condition if the choice is out of range. But i am not getting the desired output. So if while going through the switch condition the user does not input 1-3 as input, i want it to go to default condition which should trigger the error statement and then keep looping Console.WriteLine("Which book would you like to check out?"); Console.WriteLine("select 1 for book 1, 2 for book 2, and 3 for book 3"); int choice=Convert.ToInt32(Console.ReadLine()); bool loopBreak

问题 So I got a question and I was hoping you can point me to the right direction, full context problem, I have a 3D numpy array that I use to create graphs using Networkx and with these graphs I find the shortest path. What I need is that given a set of coordinates add "1" in these coordinates until the list of the shortest path changes (This is just an example, the list of coordinates can have more coordinates), my code is the following: import numpy as np import networkx as nx arr = np.array([[

问题 from selenium import webdriver import time browser = webdriver.Chrome('C:/Users/acer/Desktop/chromedriver') browser.get('website') def user(): while True: time.sleep(1) try: browser.find_element_by_id('q').send_keys('name') #Type in name browser.find_element_by_tag_name('button').click() #Click "verify" finally: browser.find_element_by_tag_name('button').click() #When connection times out, click "try again" user() #When connection times out again run "while loop" from the begining I want to

问题 from selenium import webdriver import time browser = webdriver.Chrome('C:/Users/acer/Desktop/chromedriver') browser.get('website') def user(): while True: time.sleep(1) try: browser.find_element_by_id('q').send_keys('name') #Type in name browser.find_element_by_tag_name('button').click() #Click "verify" finally: browser.find_element_by_tag_name('button').click() #When connection times out, click "try again" user() #When connection times out again run "while loop" from the begining I want to

问题 My Code: while(scanf("%f", &number) && number > 0) while(scanf("%f", &number) == 1 && number > 0) What does this == 1 and is this necessary? 回答1: As, Weather Vane said in the comments, the ==1 is important if scanf() returns EOF (End Of File or -1) which would be evaluated to true and since the value in number remains unchanged from the previous iteration the condition of the while loop would be evaluated to true . This is not appropriate since we have an error at the scan process then and

问题 1.fetch user data and display in tabular fashion <?php while($row=mysqli_fetch_assoc($rResultSet)) { ?> <td><?php echo $row['id']?></td> <td><?php echo $row['name']?></td> <td><?php echo $row['user_role']?></td> <td><?php echo $row['start_date']?></td> <td> <form id='euser' action='edituser.php' method='post'> <input type="hidden" name="id" value="<?php echo $row['id']?>"> <input type="hidden" name="type" value="edituser"> <a href="javascript: document.getElementById('euser').submit();">Edit<

问题 1.fetch user data and display in tabular fashion <?php while($row=mysqli_fetch_assoc($rResultSet)) { ?> <td><?php echo $row['id']?></td> <td><?php echo $row['name']?></td> <td><?php echo $row['user_role']?></td> <td><?php echo $row['start_date']?></td> <td> <form id='euser' action='edituser.php' method='post'> <input type="hidden" name="id" value="<?php echo $row['id']?>"> <input type="hidden" name="type" value="edituser"> <a href="javascript: document.getElementById('euser').submit();">Edit<

问题 So, i have this code that returns me a simple table with the correct db values: <?php echo "<table border='1'> <tr> <th>Código</th> <th>Nome</th> <th>Indicou</th> </tr>"; while($coluna_bd_tabela = mysqli_fetch_array($sql_indicador_resul)){ echo "<tr>"; echo "<td>" . $coluna_bd_tabela['usu_codigo'] . "</td>"; echo "<td>" . $coluna_bd_tabela['usu_nome'] . "</td>"; echo "<td>" . $coluna_bd_tabela['usu_indicador_codigo'] . "</td>"; echo "</tr>"; } echo "</table>"; ?> And this one is the stylized

问题 I am building a script to plot smooth and plot values. However, I am having trouble getting the yes/no function to control the while loop. I am setting the while condition equal to "N" and waiting for the user to say they like the plotting (input of Y) before exiting. I am getting a "NameError: name 'reply' is not defined." import matplotlib.pyplot as plt import numpy while True: reply[0] = 'n' def yes_or_no(question): reply = str(input(question+' (y/n): ')).lower().strip() if reply[0] == 'y'

问题 I want my code to do this, but with music playing in the background: import time while True: print ('ligma') time.sleep(1.5) I tried this: import time import winsound while True: print ('ligma') time.sleep(1.5) winsound.PlaySound("dank", winsound.SND_ALIAS) but, it repeats the sound then repeats the word. I am expecting it to repeat the word and play the sound at the same time. 回答1: You need to play the sound on another thread, so your other code can be executing at the same time. import time