Python Multiprocessing 运行进程两次？

问题描述

运行以下 Python 3 脚本，由于某种原因，我无法理解 startWebview 函数执行两次，导致打开了两个 PyWebView 窗口。

# Import Modules Here
import os
import time
import webview
import os.path
import multiprocessing
from dotenv import load_dotenv
from flask_wtf import FlaskForm
from flask_mde import Mde,MdeField
from wtforms import SubmitField,StringField
from wtforms.validators import Inputrequired,Datarequired,Length
from flask import Flask,request,render_template,flash,session,url_for

app = Flask(__name__)
load_dotenv()
mde = Mde(app)
app.config['SECRET_KEY'] = os.environ.get("FLASK_SECRET_KEY")

windowTitle = os.environ.get("WINDOW_TITLE")
fileDirPath = os.environ.get("FILE_DIRECTORY")


def error_flasher(form):
    for field,message_list in form.errors.items():
        for message in message_list:
            flash(form[field].label.text + ': ' + message,'error')
    print(message,message_list)


def fileHandler(form):
    savePath = os.path.join(fileDirPath,form.title.data)
    f = open(savePath,"w+")
    f.write(form.editor.data)
    f.close()


def contentLoader(form):
    savePath = os.path.join(fileDirPath,form.title.data)
    fileName = savePath
    f = open(fileName,"r")
    return f.read()


class MdeForm(FlaskForm):

    title = StringField('Title',validators=[Datarequired()])

    editor = MdeField(
        validators=[
            #Inputrequired("Input required"),Length(min=0,max=30000)
        ]
    )
    submit = SubmitField()


@app.route('/',methods=['GET','POST'])
def index():
    form = MdeForm()

    if form.validate_on_submit() and form.editor.data == "":
        form.editor.data = contentLoader(form)

    elif form.validate_on_submit() and form.editor.data != "":
        session['editor'] = request.form['editor']
        fileHandler(form)
        form.title.data = ""
        form.editor.data = ""

    return render_template("index.html",form=form,windowTitle=windowTitle)


def startFlaskServer():
    app.run(debug=True)


def startWebview():
    webview.create_window(windowTitle,'http://localhost:5000')
    webview.start(debug=True)


if __name__ == "__main__":

    p1 = multiprocessing.Process(target=startFlaskServer)
    p2 = multiprocessing.Process(target=startWebview)

    p1.start()
    time.sleep(2)
    p2.start()
    p2.join()
    p1.terminate()

如上图所示，原因似乎是两个 GET 请求，因为第二个 Webview 仅在第二个 GET 请求之后加载。

提前致谢！

解决方法

这个问题似乎是由多处理重新评估文件引起的，正如@Carcigenicate 所建议的那样。

从多线程转向线程解决的问题。