单击按钮时如何从另一个 Python 文件中读取 QLineEdit 值的值

Question

单击按钮时，我试图从另一个 python 文件中读取 QLineEdit 的值（prog 中的 search_dir_te）。但它失败了。请指导。

First.py：

class Display(QWidget): 

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        search_dir_label = QLabel('Directory to Search')
        self.search_dir_te = QLineEdit()
        search_dir_layout = QHBoxLayout(self)
        search_dir_layout.addWidget(search_dir_label)
        search_dir_layout.addWidget(self.search_dir_te)
        vert_layout1.addLayout(search_dir_layout)

        search_button = QPushButton('Search')
        search_button.clicked.connect(initiatesearch)   
        cancel_button = QPushButton('Cancel')
        search_cancel_layout = QHBoxLayout(self)
        search_cancel_layout.addWidget(search_button)
        search_cancel_layout.addWidget(cancel_button)
        search_cancel_layout.setAlignment(Qt.AlignCenter)
        vert_layout1.addLayout(search_cancel_layout)

---

Second.py

    def initiatesearch(self):
        print(self.search_dir_te.text())

我在First.py中导入了initialsearch函数

Answer 1

您将应用程序的各个部分不必要地交织在一起，这是设计不佳的标志。函数就像一个黑匣子：接收信息、处理信息并返回结果。在这种情况下，“initiatesearch”您应该只获取文本而不是小部件或其他元素：

def initiatesearch(text):
    print(text)

class Display(QWidget): 
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        search_dir_label = QLabel('Directory to Search')
        self.search_dir_te = QLineEdit()
        search_dir_layout = QHBoxLayout(self)
        search_dir_layout.addWidget(search_dir_label)
        search_dir_layout.addWidget(self.search_dir_te)
        vert_layout1.addLayout(search_dir_layout)

        search_button = QPushButton('Search')
        search_button.clicked.connect(self.onClicked)   
        cancel_button = QPushButton('Cancel')
        search_cancel_layout = QHBoxLayout(self)
        search_cancel_layout.addWidget(search_button)
        search_cancel_layout.addWidget(cancel_button)
        search_cancel_layout.setAlignment(Qt.AlignCenter)
        vert_layout1.addLayout(search_cancel_layout)

    def onClicked(self):
        initiatesearch(self.search_dir_te.text())

更新：

如果您仍然想知道这是一种不好的做法，那么您可以执行以下操作：

def onClicked(self):
    initiatesearch(self)

def initiatesearch(ui):
    print(ui.search_dir_te.text())

更新2：

from functools import partial
# ...
search_button.clicked.connect(partial(initiatesearch, self))