[Python] How do I create and save a text into that PDF file and save it in desktop using...

I am making an mcq generator using AI (for questions based on given paragraph) and I want to save that AI returned text into a PDF file and save it in the user's desktop but I am getting no directory/no permission error.

I use toga for cross platform. I used a library called reportlab to create the PDF.

from reportlab.genpdf import canvas

def pdf_file_question_write(self, widget):
try:
os_name = platform.system()
if os_name == "Windows":
desktop_path = os.path.join(os.environ['USERPROFILE'], 'Desktop')
elif os_name in ["Linux", "Darwin"]: # macOS is "Darwin"
desktop_path = os.path.join(os.path.expanduser("~"), 'Desktop')
elif "ANDROID_BOOTLOGO" in os.environ:
# If running on Android, use the Downloads folder
desktop_path = "/storage/emulated/0/Download"
else:
raise Exception("Unsupported operating system")

output_path = os.path.join(desktop_path, "MCQ Generator.pdf")

# Create a PDF and add text
pdf = canvas.Canvas(output_path)
pdf.setFont("Helvetica", 12)
pdf.drawString(100, 800, "Generated Questions:") # Title
text_lines = str(self.Generated_Question).split("\n") # Split text into lines
y = 780 # Start position for text
for line in text_lines:
pdf.drawString(100, y, line)
y -= 15 # Move down for the next line
pdf.save() # Save the PDF
print(f"PDF saved successfully at: {output_path}")

except Exception as e:
print(f"An error occurred: {str(e)}")

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