要求用户选择一个文件夹以在 Python 中读取文件
tkinterpythongui-programming更新于 2024/2/5 0:12:17
如果您曾经想知道 Python 应用程序中的对话框是如何工作的，那么您可能最终听说过 Tkinter 中的 filedialog 模块。filedialog 模块包含许多内置函数，可用于显示各种类型的对话框以处理系统中的文件。
在大多数情况下，我们使用 filedialog.askopenfilename() 函数要求用户浏览和打开系统中的文件。根据文件类型的选择，脚本被编程为执行写入或读取操作。
打开文件后，您可以使用 open(file, 'mode') 函数以任何模式打开和执行操作。为了演示这一点，我们举一个例子，我们将创建一个应用程序，要求用户打开一个文本文件。一旦选择并打开一个文件，我们就可以使用"读取"操作模式读取此文件。
示例
# 导入库
from tkinter import *
from tkinter import filedialog
# 创建窗口实例
win=Tk()
# 设置窗口的几何形状
win.geometry("700x300")
# 创建标签
Label(win, text="Click the button to open a dialog", font='Arial 16 bold').pack(pady=15)
# 在系统中打开文件的函数
def open_file():
filepath = filedialog.askopenfilename(title="Open a Text File", filetypes=(("text
file = open(filepath,'r')
print(file.read())
file.close()
# 创建一个按钮来触发对话框
button = Button(win, text="Open", command=open_file)
button.pack()
win.mainloop()
输出
运行上述代码将显示一个窗口，其中有一个用于打开对话框的按钮。
选择并打开一个文本文件，控制台将显示该文件的所有内容。
Centralized Database Vs Blockchain A blockchain can be both permissionless (like Bitcoin or Ethereum) or permissioned (like the different Hyperledger blockchain frameworks). A permissionless blockchain is also known as a public blockchain, because anyone can join the network. A permissioned blockchain, or private blockchain, requires pre-verification of the participating parties within the network, and these parties are usually known to each other. Types of Blockchains The choice between permissionless versus permissioned blockchains should be driven by the particular application at hand (or use case). Most enterprise use cases involve extensive vetting before parties agree to do business with each other. An example where a number of businesses exchange information is supply chain management. The supply chain management is an ideal use case for permissioned blockchains. You would only want trusted parties participating in the network. Each participant that is involved in the supply chain would require permissions to execute transactions on the blockchain. These transactions would allow other companies to understand where in the supply chain a particular item is.
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python 参考教程 - 该教程包含有关 python 的更多信息:https://www.cainiaomax.com/python/
