Printing to local printer using Python but printer cannot be found

Question

I'm completely stuck trying to figure out why this code isn't working. I'm ultimately trying to print to the printer named "Label Printer'. I can't seem to figure out why I cannot do it in Python, I've tested it out of Python and it's definitely connected and working.

Does it need to be defined differently or something? Or is there a different way to connect?

Any advice on connecting to a printer via python is greatly appreciated.

My full code is below - this is what I want to update:

import gspread
from oauth2client.service_account import ServiceAccountCredentials
import win32print
import tkinter as tk

# Authenticate and open the Google Sheet
creds = ServiceAccountCredentials.from_json_keyfile_name('creds.json', [
                                                         'https://spreadsheets.google.com/feeds', 'https://www.googleapis.com/auth/drive'])
client = gspread.authorize(creds)
sheet = client.open_by_key(
    '1eRO-30eIZamB5sjBp-Mz2QMKCfGxV037MQO8nS7G7AI').worksheet('Label')


class App(tk.Frame):
    def __init__(self, master=None):
        super().__init__(master)
        self.master = master
        self.master.title('Porter\'s Label Printer')
        self.master.geometry('400x300')  # Set the window size
        self.counter = 0
        self.total_labels = int(sheet.acell('F2').value)
        self.create_widgets()
        self.update_counter()

    def create_widgets(self):
        self.print_button = tk.Button(self.master, text='Print Labels', command=self.print_labels, font=(
            'Arial', 24), bg='lightblue', padx=40, pady=40)
        self.print_button.pack(fill=tk.BOTH, expand=True)

        self.counter_label = tk.Label(self.master, text='0 of {} labels printed'.format(
            self.total_labels), font=('Arial', 18))
        self.counter_label.pack(pady=20)

        self.refresh_button = tk.Button(self.master, text='Refresh', command=self.refresh_labels, font=(
            'Arial', 14), bg='lightgrey', padx=20, pady=10)
        self.refresh_button.pack(pady=20)

    def print_labels(self):
        for i in range(self.total_labels):
            win32print.SetDefaultPrinter('Label Printer')
            print_label_data = sheet.cell(sheet.find(
                'Label').row, sheet.find('Label').col).value
            print(print_label_data)
            self.counter += 1
            self.update_counter()

    def refresh_labels(self):
        try:
            self.total_labels = int(sheet.acell('F2').value)
            self.counter = 0
            self.update_counter()
            self.print_button.config(state=tk.NORMAL)
            self.counter_label.config(fg='black')
        except ValueError:
            print('Error: could not convert F2 value to an integer')
            self.total_labels = 0
            self.counter_label.config(
                text='Invalid number of labels!', fg='red')
            self.print_button.config(state=tk.DISABLED)

    def update_counter(self):
        if self.counter == self.total_labels:
            self.counter_label.config(
                text='All documents printed!', fg='green')
            self.print_button.config(state=tk.DISABLED)
        else:
            self.counter_label.config(text='{} of {} labels printed'.format(
                self.counter, self.total_labels))


# Authenticate and open the Google Sheet
creds = ServiceAccountCredentials.from_json_keyfile_name('creds.json', [
                                                         'https://spreadsheets.google.com/feeds', 'https://www.googleapis.com/auth/drive'])
client = gspread.authorize(creds)
sheet = client.open_by_key(
    '1eRO-30eIZamB5sjBp-Mz2QMKCfGxV037MQO8nS7G7AI').worksheet('Label')

# Create a GUI window
root = tk.Tk()
app = App(master=root)

# Run the GUI
app.mainloop()

I've also tried a much more basic script just to print, but can't get this working either:

import win32print

# Set the IP address of the printer
printer_ip = '192.168.1.10'

# Create a printer handle
printer_handle = win32print.OpenPrinter(fr"\\{printer_ip}\ZDesigner GK420d")

# Get the default printer settings
default_printer_settings = win32print.GetPrinter(printer_handle, 2)

# Start a print job
job_info = ('Test Print', None, default_printer_settings, None)
job_id = win32print.StartDocPrinter(printer_handle, 1, job_info)

# Send the test page to the printer
win32print.StartPagePrinter(printer_handle)
win32print.WritePrinter(printer_handle, b'test')
win32print.EndPagePrinter(printer_handle)

# End the print job
win32print.EndDocPrinter(printer_handle)

# Close the printer handle
win32print.ClosePrinter(printer_handle)

I've tried connecting the printer via IP, but it can't be found. I retrieved all of the IP addresses from command prompt, but when it was plugged into the computer and when unplugged the list didn't change - I dont think it's being recognized. I can't get the IP from printer properties either - the port tab doesn't have them.