如何让Oanda API Python包装器oandapy和PyQt一起工作？

Question

这是我在 oandapy 和 PyQt 时遇到问题的一个非常基本的例子：我无法让它们一起工作。

目标是激活GUI窗口并获取数据流（在此示例中，数据流将在终端窗口中打印）。

当我激活oandapy流式传输（参见stream.rates(account, instruments="EUR_USD")）时，PyQt GUI（此示例中为，它是一个空窗口）不会出现。在终端窗口中，您可以看到数据流。

任何帮助？

提前谢谢你，
吉尔伯托

P.S。要运行此示例，您必须根据您的Oanda API帐户更改account和access_token设置。

# --- GUI

import sys
from PyQt5 import QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.resize(400, 300)

# --- OANDA

import oandapy

class Streamer(oandapy.Streamer):
    def __init__(self, *args, **kwargs):
        super(Streamer, self).__init__(*args, **kwargs)

    def on_success(self, data):
        print(data, "\n")

account = "12345"
stream = Streamer(environment="practice", access_token="abc123-def456")

# --- MAIN

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()

    print('Start')
    #stream.rates(account, instruments="EUR_USD") # if commented, the GUI window appears, otherwise it will not

    sys.exit(app.exec_())

解决方案

感谢@ekhumoro的建议我修改了以下代码（只是一个例子，不需要Oanda凭证）。

# --- GUI

import sys
from PyQt5 import QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.resize(400, 300)

# --- TEST LOOP

import time

def loop(): # this is a test function
    while 1:
        print('.', sep=' ', end='', flush=True) # print "." in line
        time.sleep(1) # pause 1 sec

# --- THREADING

from threading import Thread

# --- MAIN

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()

    print('\n\n BEFORE \n\n')

    # loop() # this blocks
    Thread(target=loop).start() # this doesn't block, check the terminal

    print('\n\n AFTER \n\n')

    sys.exit(app.exec_())

Oanda的代码

# --- GUI

import sys
from PyQt5 import QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.resize(400, 300)

# --- OANDA

import oandapy

class Streamer(oandapy.Streamer):
    def __init__(self, *args, **kwargs):
        super(Streamer, self).__init__(*args, **kwargs)

    def on_success(self, data):
        print(data, "\n")


def DataStream():
    account = "..."
    stream = Streamer(environment="practice", access_token="...")
    stream.rates(account, instruments="EUR_USD")

# --- THREADING

from threading import Thread

# --- MAIN

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()

    print('Start')
    Thread(target=DataStream).start() # this doesn't block

    sys.exit(app.exec_())