Python - run two commands at the same time

Question

I am new to Python and am having trouble with this piece of code:

while true:
   rand = random.choice(number)
   print(rand)             
   enter_word = inp         


        

Answer 1

you have to run two concurrent threads at the same time in order to get rid of such blocking. looks like there are two interpreters that run your code and each of them executes particular section of your project.

Answer 2

To wait for input and to display some random output at the same time, you could use a GUI (something with an event loop):

#!/usr/bin/env python3
import random
from tkinter import E, END, N, S, scrolledtext, Tk, ttk, W

class App:
    password = "123456" # the most common password

    def __init__(self, master):
        self.master = master
        self.master.title('To stop, type: ' + self.password)

        # content frame (padding, etc)
        frame = ttk.Frame(master, padding="3 3 3 3")
        frame.grid(column=0, row=0, sticky=(N, W, E, S))
        # an area where random messages to appear
        self.textarea = scrolledtext.ScrolledText(frame)
        # an area where the password to be typed
        textfield = ttk.Entry(frame)
        # put one on top of the other
        self.textarea.grid(row=0)
        textfield.grid(row=1, sticky=(E, W))

        textfield.bind('<KeyRelease>', self.check_password)
        textfield.focus() # put cursor into the entry
        self.update_textarea()

    def update_textarea(self):
        # insert random Unicode codepoint in U+0000-U+FFFF range
        character = chr(random.choice(range(0xffff)))
        self.textarea.configure(state='normal') # enable insert
        self.textarea.insert(END, character)
        self.textarea.configure(state='disabled') # disable editing
        self.master.after(10, self.update_textarea) # in 10 milliseconds

    def check_password(self, event):
        if self.password in event.widget.get():
            self.master.destroy() # exit GUI

App(Tk()).master.mainloop()

Answer 3

This can be achieved by using the multiprocessing module in python, please find the code below

#!/usr/bin/python
from multiprocessing import Process,Queue
import random
import time

def printrand():
   #Checks whether Queue is empty and runs
   while q.empty():
      rand = random.choice(range(1,100))
      time.sleep(1)
      print rand


if __name__ == "__main__":
   #Queue is a data structure used to communicate between process 
   q = Queue()
   #creating the process
   p = Process(target=printrand)
   #starting the process
   p.start()
   while True:
      ip = raw_input("Write something: ")
      #if user enters stop the while loop breaks
      if ip=="stop":
         #Populating the queue so that printramd can read and quit the loop
         q.put(ip)
         break
   #Block the calling thread until the process whose join() 
   #method is called terminates or until the optional timeout occurs.
   p.join()

Answer 4

I want to be able to input words in the console while, at the same time, have random numbers appear in the console.

#!/usr/bin/env python
import random

def print_random(n=10):
    print(random.randrange(n)) # print random number in the range(0, n)

stop = call_repeatedly(1, print_random) # print random number every second
while True:
   word = raw_input("Write something: ") # ask for input until "quit" 
   if word == "quit":
      stop() # stop printing random numbers
      break # quit 

where call_repeatedly() is define here.

call_repeatedly() uses a separate thread to call print_random() function repeatedly.