Basically, I have 2 threads, receive and send. I want to be able to type a message, and whenever I get a new message it just gets 'printed above the line I am typing in'. first what I thought would work, and you can just paste this it will run:
import multiprocessing
import time
from reprint import output
import time
import random
import sys
def receiveThread(queue):
i = 0
while True:
queue.put(i)
i+=1
time.sleep(0.5)
def sendThread(queue):
while True:
a = sys.stdin.read(1)
if (a != ""):
queue.put(a)
if __name__ == "__main__":
send_queue = multiprocessing.Queue()
receive_queue = multiprocessing.Queue()
send_thread = multiprocessing.Process(target=sendThread, args=[send_queue],)
receive_thread = multiprocessing.Process(target=receiveThread, args=[receive_queue],)
receive_thread.start()
send_thread.start()
with output(initial_len=2, interval=0) as output_lines:
while True:
output_lines[0] = "Received: {}".format(str(receive_queue.get()))
output_lines[1] = "Last Sent: {}".format(str(send_queue.get()))
But what happens here is that i cannot send data. The input doesn't give me an EOF unlike when I put a = input(), but it overwrites whatever I put in that line, so how can I wait for the input in one thread while the other one works?
EXPECTED BEHAVOIR:
first line goes Received: 0, 1, 2, 3, 4...
second line goes [my input until I press enter, then my input]
ACTUAL BEHAVIOR if i don't check if input != ""
first line as expected only that the input overwrites the first couple of letters until it resets to Received
second line is always empty, maybe bc stdin only is filled for that one time i press enter and then always returns empty?
ACTUAL BEHAVIOR if i check if input != ""
first line stays: received = 0
second line is just like whatever i enter, if i press enter it goes into a new line where i then enter stuff
Don't use the same socket for communicating with... itself. That may be possible to do, I'm not sure, but it certainly isn't normal. Instead make a socket pair, one for the sending thread, and one for the receiving thread, e.g. this works for me:
import socket;
import multiprocessing;
def receiveThread(sock):
while True:
msg = sock.recv(1024)
print(msg.decode("utf-8"))
def sendThread(sock):
while True:
# msg=input("client: ")
# input() is broken on my system :(
msg="foo"
sock.send(bytes(msg,"utf8"))
pair = socket.socketpair()
recieve_thread_socket = pair[0]
send_thread_socket = pair[1]
send_thread = multiprocessing.Process(target=sendThread, args=[recieve_thread_socket])
receive_thread = multiprocessing.Process(target=receiveThread,args=[send_thread_socket])
send_thread.start()
receive_thread.start()
I have made a thread that is supposed to show the seconds passing. Unfortunately, when I use getstr from the curses module the whole script stops, including the thread. I have to use a thread lock to stop random characters being printed out because of overlapping orders.
Any suggestions on how to fix this or an alternative would be great!
In the below example window and window2 are already set-up...
lock = threaing.Lock()
def main_function():
#starts thread
t1 = threading.Thread(target=time_calc,args=(window2,))
t1.start()
#Gets user input
while True:
data = window1.addstr(y,x,"Type something in!")
data = window1.getstr(y,x,5)
lock.acquire()
window1.erase()
txt = "You said: "+data
window1.addstr(y,x,txt)
lock.release()
def time_calc(window2):
current_count = 0
while True:
time += 1
text = "Time Count: "+str(time)
lock.acquire()
window2.erase()
window2.addstr(y,x,text)
lock.release()
time.sleep(1)
The problem with my code
I figured out the problem with my code. You can't run a thread inside a thread for some reason and I originally had my main function called to be considered a thread. I guess I should have stated this in my question. Sorry
There is probably a way to run a thread in a thread, but this did not work for me.
My Updated Code
lock = threading.Lock()
def call_threads():
t1 = threading.Thread(target=main_function,args=(window1,))
t1.start()
t2 = threading.Thread(target=time_calc,args=(window2,))
t1.start()
def main_function(window1):
#Gets user input
while True:
data = window1.addstr(y,x,"Type something in!")
data = window1.getstr(y,x,5)
lock.acquire()
window1.erase()
txt = "You said: "+data
window1.addstr(y,x,txt)
lock.release()
def time_calc(window2):
current_count = 0
while True:
time += 1
text = "Time Count: "+str(time)
lock.acquire()
window2.erase()
window2.addstr(y,x,text)
lock.release()
time.sleep(1)
If there is anything else that may have caused this error, please comment it!
I am working on a Python scripts that kicks off a thread with a loop and a raw_input so that user can enter commands. After this thread starts, main program starts a loop with another raw_input so that the user can enter commands.
How can this be organized so that the commands being inputted via console goes to the correct raw_input (main thread/concurrent thread)? At the moment, all inputs in the console are going to the main thread only.
Thanks
Example
import threading
def commThread():
while True:
chatAcceptance = raw_input("User")
t1 = threading.Thread(target=commThread)
t1.start()
while True:
userInput = raw_input("\nPlease insert a command:\n")
So this can be done via lock. I did a small code example that shows how to swap between one "scope" to the other using the raw_input.
import threading
lock = threading.Lock()
def inputReader(thread, prompt):
userInput = raw_input(prompt)
print thread + " " + userInput + "\n"
return userInput
def myThread1():
global lock
while True:
lock.acquire()
print "thread 1 got the lock\n"
while True:
threadInput = inputReader("thread 1", "from thread 1\n")
if threadInput == "release":
lock.release()
print "thread 1 released the lock\n"
break
def myThread2():
global lock
while True:
lock.acquire()
print "thread 2 got the lock\n"
while True:
threadInput = inputReader("thread 2", "from thread 2\n")
if threadInput == "release":
lock.release()
print "thread 2 released the lock\n"
break
t1 = threading.Thread(target=myThread1).start()
t2 = threading.Thread(target=myThread2).start()
I've made a python script that factorizes a number into its prime factors. However when dealing with big numbers i may like to have an idea to the progress of the computation. (I simplified the script)
import time, sys, threading
num = int(input("Input the number to factor: "))
factors = []
def check_progress():
but = input("Press p: ")
if but == "p":
tot = int(num**(1/2))
print("Step ", k, " of ", tot, " -- ", round(k*100/tot,5), "%", end="\r", sep="")
t = threading.Thread(target=check_progress) ?
t.daemon = True ?
t.start() ?
k = 1
while(k != int(num**(1/2))):
k = (k+1)
if num%k == 0:
factors.append(int(k))
num = num//k
k = 1
print(factors)
I'm wondering if there is a way to show the progress on demand, for example, during the loop, i press a key and it prints the progress?
How can i implement a thread of something like that in my script?
Thanks and sorry for my english
Edit:
def check_progress():
while True:
but = input("## Press return to show progress ##")
tot = int(num**(1/2))
print("Step ", k, " of ", tot, " -- ", round(k*100/tot,5), "%", sep="")
Here is one possible design:
Main thread:
create queue and thread
start the progress thread
wait user input
on input:
pop result from queue (may be None)
display it
loop
Progress thread:
do the work an put status in queue
I can provide example, but I feel you are willing to learn. Feel free to comment for help.
Edit: Full example with queue.
from time import sleep
from Queue import Queue
from threading import Thread
# Main thread:
def main():
# create queue and thread
queue = Queue()
thread = Thread(target=worker, args=(queue,))
# start the progress thread
thread.start()
# wait user input
while thread.isAlive():
raw_input('--- Press any key to show status ---')
# pop result from queue (may be None)
status = queue.get_nowait()
queue.task_done()
# display it
if status:
print 'Progress: %s%%' % status
else:
print 'No status available'
# Progress thread:
def worker(queue):
# do the work an put status in queue
# Simulate long work ...
for x in xrange(100):
# put status in queue
queue.put_nowait(x)
sleep(.5)
if __name__ == '__main__':
main()
I've been working on a python game in my spare time, and I've run into a problem. I'm working with sockets using the basic threads module, and it works fine when I connect to the server file with one client. But more than that, and any that connect after the first freezes up the server and the first client.
Here is the code for the server
import socket
import random
import thread
from saveState import Save
from grid import Grid
import time
players = 0
save = Save()
grid = Grid()
def ready(c):
ready = raw_input("Are you ready to play?\n")
if(ready == "yes" or ready == "y"):
grid.makeGrid()
c.send("ready")
def clientThread(conn,players):
while True:
print "taking requests"
request = conn.recv(1024)
segments = request.split(",,")
if(segments[0] == "0" and players<200):
print "registering player", addr
serial = random.choice(list(range(999999)))
conn.send("{}".format(serial))
save.players[serial] = segments[2:]
print save.players[serial][9]
players+=1
elif(segments[0] == "3"):
if(segments[2] == "land"):
conn.send("{},,{},,{},,{}".format(grid.getLandType(int(save.players[serial][9]),int(save.players[serial][10])), grid.getDesc(int(save.players[serial][9]),int(save.players[serial][10])),int(save.players[serial][9]),int(save.players[serial][10])))
elif(segments[0]=="2"):
if(segments[2]=="playerX" and int(segments[3])==-1):
save.players[serial][9] = int(save.players[int(serial)][9])-1
elif(segments[2]=="playerX"):
save.players[serial][9] = int(save.players[int(serial)][9])+1
if(segments[2]=="playerY" and int(segments[3])==-1):
save.players[serial][10] = int(save.players[int(serial)][10])-1
elif(segments[2]=="playerY"):
save.players[serial][10] = int(save.players[int(serial)][10])+1
elif(segments[0]=="4"):
alreadySent = []
for m in grid.monsters:
if(m.X==save.players[int[segment[1]]][9] and m.Y==save.players[int[segment[1]]][10] and alreadySent[m]==False):
conn.send("{},,{}".format(m.name, True))
elif(time.clock == 60*60*(12+8)):
conn.send("{},,{}".format("You see the sun set on the horizon. Monsters will be more aggressive now.", False))
else:
print "sorry, there is an inconsistency in the request or the queue is full."
try:
#start up socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
name = socket.gethostbyname(socket.gethostname())
print name
port = input("select port\n")
s.bind((name, port))
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
#listen for any attempts to connect to the api
#if anyone connects, give them a serial number and add their data to a storage file
while True:
s.listen(5)
c,addr = s.accept()
thread.start_new_thread(ready,(c,))
thread.start_new_thread(clientThread,(c, players))
conn.close
sock.close
except socket.error:
print " either the server port is closed or in use. try again"
and the client
import random
from grid import Grid
from player import Player
from descriptions import Descriptions
import socket
import time
import thread
description = Descriptions()
def descisionHandler(s,serial):
while True:
s.send("{},,{},,{}".format(3,serial,"land"))
response = s.recv(1024).split(",,")
print "you are on a {} tile \n {} \n {} \n {}".format(response[0], response[1],response[2], response[3])
action=raw_input("What Will You Do?\n")
try:
if(action == "west" and player.locX>0):
s.send("{},,{},,{},,{}".format(2,serial,"playerX",-1))
time.sleep(0.5)
elif(action == "east" and player.locX<199):
s.send("{},,{},,{},,{}".format(2,serial,"playerX",1))
time.sleep(0.5)
elif(action == "north" and player.locY>0):
s.send("{},,{},,{},,{}".format(2,serial,"playerY",-1))
time.sleep(0.5)
elif(action == "south" and player.locY<199):
s.send("{},,{},,{},,{}".format(2,serial,"playerY",1))
time.sleep(0.5)
# elif(action == "attack" and monster_data[1]):
# print "The {} wakes up! A battle begins!".format(monster_data[0])
elif(action == "profile"):
print " You are {} \n {} \n your role is {} \n you have an attack of {} \n a defense of {} \n a speed of {} \n and {} hitpoints \n attacks: {} \n you are located at {} {}".format(player.name,
player.backstory,player.role,player.attack,player.defense,player.speed, player.hitpoints, player.attacks, player.locX, player.locY)
elif(action == "exit"):
break
except IndexError:
pass
def eventHandler(s,serial):
while True:
s.send("{},,{}".format(4,serial))
response = s.recv(1024).split(",,")
print response[0]
return bool(response[1])
while True:
try:
print "\nWelcome to Overseer! We need a few things before we begin\n"
name = raw_input("What is your name?\n")
backstory = raw_input("What is in your past: choose one \n chosen \n magician \n poet\n")
role = raw_input("what is your class: choose one \n Warrior \n Mage \n Rougue \n Bard\n")
player = Player(name,description.player_backstory[backstory], role, 5,5,5,10, {"scrap": 10}, random.choice(list(range(200))), random.choice(list(range(200))))
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = raw_input("what host are you connecting to?")
port = input("what port?\n")
s.connect((host,port))
print "connection successful."
time.sleep(5)
s.send("{},,{},,{},,{},,{},,{},,{},,{},,{},,{},,{},,{},,{}".format(0,0,name,backstory,role,5,5,5,5,10,player.attacks,player.locX,player.locY))
serial = s.recv(1024)
print "You're serial number is {}".format(serial)
while(s.recv(1024) != "ready"):
pass
break
except socket.error:
print "server is not running or is busy. please try again."
eventThread = thread.start_new_thread(eventHandler,(s,serial))
descisionThread = thread.start_new_thread(descisionHandler,(s,serial))
while 1:
pass
I did a bit of research and my best guess is that I need to use locks from the threading module, but I'm not sure. any suggestions?
Thanks in advance!
So the issue was the console input, as theSmallNothing said. There wasn't really a way around this limitation without serious hacking, so I proposed to improvise. My solution was to create a web app with python instead of using a console. There were a few advantages to this.
the server can handle multiple inputs at a time easily
things can happen while input is being entered(the solution to my problem)
no files need be downloaded for the user as everything can be accessed simply by entering the web address.
While not a perfect solution, sometimes finding an alternative is the next best thing.
Thanks all for your awesome help!