从单独的 Python 脚本对 Python 脚本执行命令? [英] Execute command to a Python script from separate Python script?

问题描述

我正在尝试将命令从一个 python 脚本发送到在终端中运行的另一个脚本.

I'm trying to send a command from one python script to another running in terminal.

我在运行 Raspbian 的 RPi 上运行两个 python 脚本.第一个脚本是一个循环，它等待用户输入一个数字并将其添加到总数中.第二个脚本使用 PySide2 在 QPushButton 被释放时打印一个数字.

I'm running two python scripts on an RPi running Raspbian. The first script is a loop that waits for the user to enter a number and adds it to a total. The second script uses PySide2 to print a number when a QPushButton is released.

我怎样才能让 QPushButton 被释放时运行的函数将命令(或变量)发送到等待的第一个脚本并执行它?

How can i make it so that the function that runs when the QPushButton is released, sends a command (or variable) into the waiting first script and executes it?

我已经阅读了一些关于使用 subprocess.call 和 os.system 的内容，但我不确定我在用这些命令做什么，或者它们适合我想做的事情.

I've read some things about using subprocess.call and os.system but i'm not really sure what i'm doing with these commands, or if they're appropriate for what i want to do.

第一个脚本:

x = 0
while x < 10:
    y = int(input("enter number:"))
    x += y
    print(x)

print("x is ten!")

第二个脚本:

import sys
from PySide2.QtWidgets import *

class MainWindow(QWidget):
    def __init__(self):
        QWidget.__init__(self)

        self.btn = QPushButton("test")

        layout = QVBoxLayout()
        layout.addWidget(self.btn)

        self.setLayout(layout)

        self.btn.released.connect(self.btnpress)

    def btnpress(self):
        print(1)

app = QApplication(sys.argv)

window = MainWindow()
window.show()
app.exec_()

推荐答案

如果您想运行脚本并通过 stdin 发送信息，那么在 Qt 中最好的选择是使用 QProcess:

If you want to run a script and send information through stdin then in Qt the best option is to use QProcess:

import os.path
import sys

from PySide2.QtCore import QProcess
from PySide2.QtWidgets import QApplication, QPushButton, QSpinBox, QVBoxLayout, QWidget

CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))


class MainWindow(QWidget):
    def __init__(self):
        QWidget.__init__(self)

        self.btn = QPushButton("test")
        self.spinbox = QSpinBox()

        self.process = QProcess()
        self.process.readyReadStandardError.connect(self.handle_readyReadStandardError)
        self.process.readyReadStandardOutput.connect(
            self.handle_readyReadStandardOutput
        )
        self.process.setProgram(sys.executable)
        script_path = os.path.join(CURRENT_DIR, "script.py")
        self.process.setArguments([script_path])
        self.process.start()

        layout = QVBoxLayout(self)
        layout.addWidget(self.spinbox)
        layout.addWidget(self.btn)
        self.btn.released.connect(self.btnpress)

    def btnpress(self):
        number = self.spinbox.value()

        msg = "{}\n".format(number)
        self.process.write(msg.encode())

    def handle_readyReadStandardError(self):
        print(self.process.readAllStandardError().data().decode())

    def handle_readyReadStandardOutput(self):
        print(self.process.readAllStandardOutput().data().decode())


app = QApplication(sys.argv)

window = MainWindow()
window.show()
app.exec_()

注意:您不必在第二个 shell 中运行脚本，因为脚本本身会启动它.

Note: You don't have to run the script in a second shell as the script itself starts it.

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