np.save(file_path, self.matrix_dict, allow_pickle=True) 如何保存字典数据和读取字典数据文件

可以使用 `numpy` 库的 `save` 和 `load` 方法来保存和读取字典数据文件。

保存字典数据文件：

import numpy as np

matrix_dict = {'key1': np.array([1, 2, 3]), 'key2': np.array([4, 5, 6])}
file_path = 'matrix_dict.npy'
np.save(file_path, matrix_dict, allow_pickle=True)

其中，`matrix_dict` 是要保存的字典数据，`file_path` 是文件路径，`allow_pickle=True` 表示允许保存任意的 Python 对象。

读取字典数据文件：

import numpy as np

file_path = 'matrix_dict.npy'
matrix_dict = np.load(file_path, allow_pickle=True).item()

其中，`file_path` 是要读取的文件路径，`allow_pickle=True` 表示允许读取任意的 Python 对象。`item()` 方法用于将 `numpy` 数组转换为字典对象。

读取后的 `matrix_dict` 就是保存的字典数据。

相关问题

np.save(file_path, self.matrix_dict, allow_pickle=True) 如何保存字典数据

你可以使用`numpy.save()`函数来保存字典数据，步骤如下：

1. 将字典数据转换为numpy数组，可以使用`numpy.array()`函数。
2. 使用`numpy.save()`函数将numpy数组保存到文件中。

示例代码如下所示：

import numpy as np

# 假设有一个字典数据
my_dict = {'a': 1, 'b': 2, 'c': 3}

# 将字典数据转换为numpy数组
my_array = np.array(list(my_dict.items()))

# 保存numpy数组到文件中
file_path = 'my_dict.npy'
np.save(file_path, my_array)

在上面的示例中，我们使用`list()`函数将字典的键值对转换为列表，然后使用`numpy.array()`函数将列表转换为numpy数组。最后，我们使用`numpy.save()`函数将numpy数组保存到文件中。

import os from PyQt5.QtCore import Qt from PyQt5.QtGui import QPixmap, QIcon from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QVBoxLayout, QHBoxLayout, QTreeView, QFileSystemModel class ImageViewer(QWidget): def init(self, folder_path): super().init() self.folder_path = folder_path self.image_dict = {} self.current_image = None self.setWindowTitle("Image Viewer") self.setFixedSize(1000, 600) self.image_label = QLabel(self) self.image_label.setAlignment(Qt.AlignCenter) self.tree_view = QTreeView() self.tree_view.setMinimumWidth(250) self.tree_view.setMaximumWidth(250) self.model = QFileSystemModel() self.model.setRootPath(folder_path) self.tree_view.setModel(self.model) self.tree_view.setRootIndex(self.model.index(folder_path)) self.tree_view.setHeaderHidden(True) self.tree_view.setColumnHidden(1, True) self.tree_view.setColumnHidden(2, True) self.tree_view.setColumnHidden(3, True) self.tree_view.doubleClicked.connect(self.tree_item_double_clicked) self.main_layout = QHBoxLayout(self) self.main_layout.addWidget(self.tree_view) self.main_layout.addWidget(self.image_label) self.load_images() self.update_image() def load_images(self): for file_name in os.listdir(self.folder_path): if file_name.lower().endswith((".jpg", ".jpeg", ".png", ".gif", ".bmp")): file_path = os.path.join(self.folder_path, file_name) self.image_dict[file_name] = file_path current_image = list(self.image_dict.keys())[0] def update_image(self): if self.current_image is not None: pixmap = QPixmap(self.image_dict[self.current_image]) self.image_label.setPixmap(pixmap.scaled(self.width() - self.tree_view.width(), self.height(), Qt.KeepAspectRatio, Qt.SmoothTransformation)) def tree_item_double_clicked(self, index): file_name = self.model.fileName(index) if file_name in self.image_dict: self.current_image = file_name self.update_image() def keyPressEvent(self, event): if event.key() == Qt.Key_A: self.previous_image() elif event.key() == Qt.Key_D: self.next_image() elif event.key() in [Qt.Key_1, Qt.Key_2, Qt.Key_3, Qt.Key_4, Qt.Key_5]: self.save_text_file(event.key() - Qt.Key_0) def previous_image(self): if self.current_image is not None: file_names = list(self.image_dict.keys()) current_index = file_names.index(self.current_image) if current_index > 0: self.current_image = file_names[current_index - 1] else: self.current_image = file_names[-1] self.update_image() def next_image(self): if self.current_image is not None: file_names = list(self.image_dict.keys()) current_index = file_names.index(self.current_image) if current_index < len(file_names) - 1: self.current_image = file_names[current_index + 1] else: self.current_image = file_names[0] self.update_image() def save_text_file(self, number): if self.current_image is not None: file_name = self.current_image txt_file_path = os.path.join(self.folder_path, os.path.splitext(file_name)[0] + ".txt") with open(txt_file_path, "w") as file: file.write(str(number)) if name == "main": import sys app = QApplication(sys.argv) viewer = ImageViewer("D:/图片/wallpaper") viewer.show() sys.exit(app.exec_())这份代码实现不了使用键盘的A键向上翻页以及D键向下翻页，也实现不了键盘数字键生成相应txt文档，帮我分析一下错在哪里

这份代码在实现键盘事件的时候，使用了错误的函数名称。应该使用`keyPressEvent`而不是`key_press_event`函数。另外，在`save_text_file`函数中，应该先判断当前图片是否为`None`，再执行后续的代码。以下是修改后的代码：

import os 
from PyQt5.QtCore import Qt 
from PyQt5.QtGui import QPixmap, QIcon 
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QVBoxLayout, QHBoxLayout, QTreeView, QFileSystemModel 

class ImageViewer(QWidget): 
    def __init__(self, folder_path): 
        super().__init__() 
        self.folder_path = folder_path 
        self.image_dict = {} 
        self.current_image = None 
        self.setWindowTitle("Image Viewer") 
        self.setFixedSize(1000, 600) 
        self.image_label = QLabel(self) 
        self.image_label.setAlignment(Qt.AlignCenter) 
        self.tree_view = QTreeView() 
        self.tree_view.setMinimumWidth(250) 
        self.tree_view.setMaximumWidth(250) 
        self.model = QFileSystemModel() 
        self.model.setRootPath(folder_path) 
        self.tree_view.setModel(self.model) 
        self.tree_view.setRootIndex(self.model.index(folder_path)) 
        self.tree_view.setHeaderHidden(True) 
        self.tree_view.setColumnHidden(1, True) 
        self.tree_view.setColumnHidden(2, True) 
        self.tree_view.setColumnHidden(3, True) 
        self.tree_view.doubleClicked.connect(self.tree_item_double_clicked) 
        self.main_layout = QHBoxLayout(self) 
        self.main_layout.addWidget(self.tree_view) 
        self.main_layout.addWidget(self.image_label) 
        self.load_images() 
        self.update_image() 

    def load_images(self): 
        for file_name in os.listdir(self.folder_path): 
            if file_name.lower().endswith((".jpg", ".jpeg", ".png", ".gif", ".bmp")): 
                file_path = os.path.join(self.folder_path, file_name) 
                self.image_dict[file_name] = file_path 
        self.current_image = list(self.image_dict.keys())[0] 

    def update_image(self): 
        if self.current_image is not None: 
            pixmap = QPixmap(self.image_dict[self.current_image]) 
            self.image_label.setPixmap(pixmap.scaled(self.width() - self.tree_view.width(), self.height(), Qt.KeepAspectRatio, Qt.SmoothTransformation)) 

    def tree_item_double_clicked(self, index): 
        file_name = self.model.fileName(index) 
        if file_name in self.image_dict: 
            self.current_image = file_name 
            self.update_image() 

    def keyPressEvent(self, event): 
        if event.key() == Qt.Key_A: 
            self.previous_image() 
        elif event.key() == Qt.Key_D: 
            self.next_image() 
        elif event.key() in [Qt.Key_1, Qt.Key_2, Qt.Key_3, Qt.Key_4, Qt.Key_5]: 
            self.save_text_file(event.key() - Qt.Key_0) 

    def previous_image(self): 
        if self.current_image is not None: 
            file_names = list(self.image_dict.keys()) 
            current_index = file_names.index(self.current_image) 
            if current_index > 0: 
                self.current_image = file_names[current_index - 1] 
            else: 
                self.current_image = file_names[-1] 
            self.update_image() 

    def next_image(self): 
        if self.current_image is not None: 
            file_names = list(self.image_dict.keys()) 
            current_index = file_names.index(self.current_image) 
            if current_index < len(file_names) - 1: 
                self.current_image = file_names[current_index + 1] 
            else: 
                self.current_image = file_names[0] 
            self.update_image() 

    def save_text_file(self, number): 
        if self.current_image is not None: 
            file_name = self.current_image 
            txt_file_path = os.path.join(self.folder_path, os.path.splitext(file_name)[0] + ".txt") 
            with open(txt_file_path, "w") as file: 
                file.write(str(number)) 

if __name__ == "__main__": 
    import sys 
    app = QApplication(sys.argv) 
    viewer = ImageViewer("D:/图片/wallpaper") 
    viewer.show() 
    sys.exit(app.exec_())