The most popular GUI creation tool for Python, Tkinter provides a number of widgets and methods you can use to create a user interface for your application.

instance = Button(root, text="Click me!", ...)

instance = Checkbutton(parent, option, ... ) 

instance = LabelFrame( master, option, ... ) 

instance = Menubutton( master, options, ... ) 

instance = PanedWindow(master, options, ... ) 

instance = Radiobutton(master, options, ... ) 

instance = Scrollbar ( master, options, ... )

instance = ttk.Combobox(master, option=value, ...) 

instance = ttk.Notebook(container, options, ... ) 

instance = Progressbar(parent, options, ... ) 

# orient options are 'horizontal' or 'vertical':
instance = ttk.Separator(container,orient=' horizontal')

instance = ttk.Sizegrip(master, options, ... ) 

instance = ttk.Treeview(master, options, ... )

Position Widgets using pack(), place() or grid()

 organizes widgets in horizontal and vertical boxes that are limited to left, right, top, bottom positions. Each box is offset and relative to each other.

root.geometry(‘200x100’)
test = tk.Label(root, text=”pack(side=tk.bottom)”, bg=”teal”)
test.pack(side=tk.bottom)

 places widgets in a two dimensional grid using x and y absolute coordinates.

root.geometry(‘200x100’)
Label(root, text=”place(x=5, y=2)”, bg=”#A3DBE0”).place(x=5, y=2)

 locates widgets in a two dimensional grid using row and column absolute coordinates.

root.geometry(‘200x100’)
Label(root, text=”grid(row=2, column=2)”, width=12).grid(row=2, column=2)

# Pillow is imported as PIL
from PIL import ImageTk, Image
image1 = Image.open("")
test = ImageTk.PhotoImage(image1)
label1 = tkinter.Label(image=test)
label1.image = test

# Position image as the background image
label1.place(x=1, y=1)

# Resize image to fit on button
photoimage = photo.subsample(1, 2)

# Position image on button
Button(root, image = photoimage,).pack(side = BOTTOM)

Tkinter Python GUI Cheat Sheet

Let's download nodejs from Nodesource. NodeSource is a company which provides enterprise-grade Node support and maintains a repository containing the latest versions of Node.js.

curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -

Check the installation of node and npm using the following commands:

You will see the versions of nodejs and npm

Let's create a sample app and paste some basic code into it.

const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => {
res.send('Hello World!')
})

app.listen(port, () => {
console.log(`Example app listening at http://localhost:${port}`)
})

Lets now install express so that we can run this app server:

You should now be able to see the hello world page when you visit http://server-ip:3000

Let's install and use pm2 as a process manager. Install pm2 using the commands below:

Start the application using the following command:

Step 4 - Configuring Nginx as a reverse proxy

Now let's configure Nginx as a reverse proxy. This will help us get the security features from Nginx. Also, we can serve static content using Nginx.

Let's install Nginx using the following command:

Let's create a conf file for our Nodejs app using the command below

sudo vi /etc/nginx/sites-available/nodeApp

server{
server_name 165.232.177.116;

location / {
proxy_pass http://localhost:3000;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection 'upgrade';
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
}
}

Activate this configuration using the command below:

sudo ln -s /etc/nginx/sites-available/nodeApp /etc/nginx/sites-enabled

Visit http://your-ip/ and your application should work fine. Happy coding!

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