QFileDialog -文件对话框

QFileDialog继承了QDialog，具有父类的各种方法。
QFileDialog提供了一个对话框，允许用户选择文件或者目录，也允许用户遍历文件系统，用以选择一个或多个文件或者目录。

常用方法

# 获取一个打开文件的文件名
getOpenFileNames ([parent=None[, caption=””[, dir=””[, filter=””[, selectedFilter=””[, options=QFileDialog.Options()]]]]]])
# 获取保存的文件名
getSaveFileName ([parent=None[, caption=””[, dir=””[, filter=””[, selectedFilter=””[, options=QFileDialog.Options()]]]]]])

示例

ui文件

from PySide6.QtCore import (QCoreApplication, QDate, QDateTime, QLocale,
    QMetaObject, QObject, QPoint, QRect,
    QSize, QTime, QUrl, Qt)
from PySide6.QtGui import (QBrush, QColor, QConicalGradient, QCursor,
    QFont, QFontDatabase, QGradient, QIcon,
    QImage, QKeySequence, QLinearGradient, QPainter,
    QPalette, QPixmap, QRadialGradient, QTransform)
from PySide6.QtWidgets import (QApplication, QPushButton, QSizePolicy, QTextBrowser,
    QWidget)

class Ui_Form(object):
    def setupUi(self, Form):
        if not Form.objectName():
            Form.setObjectName(u"Form")
        Form.resize(255, 274)
        self.pushButton = QPushButton(Form)
        self.pushButton.setObjectName(u"pushButton")
        self.pushButton.setGeometry(QRect(20, 10, 80, 25))
        self.pushButton_2 = QPushButton(Form)
        self.pushButton_2.setObjectName(u"pushButton_2")
        self.pushButton_2.setGeometry(QRect(130, 10, 80, 25))
        self.textBrowser = QTextBrowser(Form)
        self.textBrowser.setObjectName(u"textBrowser")
        self.textBrowser.setGeometry(QRect(0, 40, 251, 231))

        self.retranslateUi(Form)

        QMetaObject.connectSlotsByName(Form)
    # setupUi

    def retranslateUi(self, Form):
        Form.setWindowTitle(QCoreApplication.translate("Form", u"QFileDialog", None))
        self.pushButton.setText(QCoreApplication.translate("Form", u"Open", None))
        self.pushButton_2.setText(QCoreApplication.translate("Form", u"Save", None))
    # retranslateUi

主文件

import sys
from PySide6 import QtCore,QtWidgets
from PySide6.QtWidgets import *

import pandas as pd 
from ui_savetest import Ui_Form


class main(QWidget):
    def __init__(self):
        super().__init__()    
        self.ui = Ui_Form()      
        self.ui.setupUi(self) 
        self.__create_connections()
        

    def __create_connections(self):              
        self.ui.pushButton.clicked.connect(self.openfile)     
        self.ui.pushButton_2.clicked.connect(self.savefile)        


    def openfile(self):
        openname,_ = QFileDialog.getOpenFileName(self,"打开文件", '.','所有文件(*.*);;文本文件(*.txt);;Python文件(*.py)')
        if openname:
            with open(openname,'r') as f:
                content = f.read()            
            self.ui.textBrowser.setText(content)
            

    def savefile(self):
        savename,_ = QFileDialog.getSaveFileName(self,"保存文件", '.','所有文件(*.*)')
        txt1 = self.ui.textBrowser.toPlainText()
        if savename:
            with open(savename,'w') as f:
                f.write(str(txt1))                 

if __name__ == '__main__':
    app = QApplication(sys.argv)
    m = main()
    m.show()    
    sys.exit(app.exec())
```