我已经在Python中创建了一个简单的脚本(我是newby)。除了一个小问题,一切都按需工作。
我的项目:我通过http向我的服务器发送请求:{ip-of-server} /?speed = 999&time = 8&cents = 50
这将在您的shell中显示一个倒数计时器。在这种情况下,从8倒数到0。那很好。当我发送{ip-of-server} /?speed = 499&time = 8&cents = 50时,它的倒计时速度将是以前的两倍。这是根据需要的。
我面临的问题:在倒计时期间,我需要能够向我的服务器发送新请求。它应使用新值更新倒计时。目前,它将创建2个倒数计时。如果您阅读了脚本,那是正确的,但不是我所需要的。我需要一些如何更新现有倒计时的帮助。
我的代码:
from flask import Flask, request
app = Flask(__name__)
import time
@app.route('/', methods = ["GET"])
def post():
speed = float(request.args["speed"])
thetime = request.args["time"]
cents = request.args["cents"]
print('\n')
print('AccuView Digital:')
print('Speed:', speed,' Time:', thetime,' Cents:', cents)
print('-------------------------------')
def countdown(thetime):
while thetime:
mins, secs = divmod(thetime, 60)
timer = '{:02d}:{:02d}'.format(mins, secs)
print('Tijd:', timer, end="\r")
time.sleep((speed+1)/1000)
thetime -= 1
if thetime == 0:
print('Werp geld in\n')
countdown(int(thetime))
return '1'
app.run(host='192.168.1.107', port= 8090)
谢谢
如您自己所说,脚本运行良好。所以现在发生的事情是flask正在创建线程来满足您的请求。您发送第一个请求,flask在一个线程上启动一个计数器,当您发送另一个请求时,flask在另一个线程上启动,另一个计数器在该线程上运行。两个线程都有各自的speed
,thetime
和cents
值,并且一个线程无法更改另一个线程中变量的值。
所以我们要做的是从任何线程访问/修改变量的值。一种简单的解决方案是使用全局变量,以便可以从所有线程访问这些变量。
解决方案:
speed
,thetime
和cents
设为全局变量,以便可以从任何线程进行修改。thetime
的值是否为0
来做到这一点。]countdown()
)。否则,我们无需执行任何操作(我们已经在上一步中更新了全局变量的值,因此现有计数器已更新)。代码:
import time
from flask import Flask, request
app = Flask(__name__)
# We create global variables to keep track of the counter
speed = thetime = cents = 0
@app.route('/', methods=["GET"])
def post():
global speed, thetime, cents
# Check if previous counter is running
counter_running = True if thetime else False
thetime = int(request.args["time"])
speed = float(request.args["speed"])
cents = request.args["cents"]
print('\n')
print('AccuView Digital:')
print('Speed:', speed, ' Time:', thetime, ' Cents:', cents)
print('-------------------------------')
def countdown():
global thetime, speed
while thetime:
mins, secs = divmod(thetime, 60)
timer = '{:02d}:{:02d}'.format(mins, secs)
print('Tijd:', timer, end="\r")
time.sleep((speed + 1) / 1000)
thetime -= 1
if thetime == 0:
print('Werp geld in\n')
# If existing counter is running, then we don't start another counter
if not counter_running:
countdown()
return '1'
app.run(host='192.168.1.107', port= 8090)
代码(以便我们可以中断睡眠):
import time
import threading
from flask import Flask, request
app = Flask(__name__)
# We create global variables to keep track of the counter
speed = thetime = cents = 0
sleep_speed = threading.Event()
@app.route('/', methods=["GET"])
def post():
global speed, thetime, cents, sleep_speed
# Check if previous counter is running
counter_running = True if thetime else False
thetime = int(request.args["time"])
speed = float(request.args["speed"])
cents = request.args["cents"]
# Make sure to interrupt counter's sleep
if not sleep_speed.is_set():
sleep_speed.set()
sleep_speed.clear()
print('\n')
print('AccuView Digital:')
print('Speed:', speed, ' Time:', thetime, ' Cents:', cents)
print('-------------------------------')
def countdown():
global thetime, speed
while thetime:
mins, secs = divmod(thetime, 60)
timer = '{:02d}:{:02d}'.format(mins, secs)
print('Tijd:', timer, end="\r")
sleep_speed.wait((speed + 1) / 1000)
thetime -= 1
if thetime == 0:
print('Werp geld in\n')
# If existing counter is running, then we don't start another counter
if not counter_running:
countdown()
return '1'
app.run(host='0.0.0.0', port=8090)