QR Code Generator with Python

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# QR Code Generator with Python

# First, install the required library:
# pip install qrcode[pil]

import qrcode
from PIL import Image

def generate_basic_qr(data, filename="qr_code.png"):
    """Generate a basic QR code"""
    qr = qrcode.QRCode(
        version=1,  # Controls the size of the QR code
        error_correction=qrcode.constants.ERROR_CORRECT_L,
        box_size=10,
        border=4,
    )
    
    qr.add_data(data)
    qr.make(fit=True)
    
    img = qr.make_image(fill_color="black", back_color="white")
    img.save(filename)
    print(f"QR code saved as {filename}")
    return img

def generate_custom_qr(data, filename="custom_qr.png"):
    """Generate a customized QR code with colors and styling"""
    qr = qrcode.QRCode(
        version=1,
        error_correction=qrcode.constants.ERROR_CORRECT_M,
        box_size=10,
        border=4,
    )
    
    qr.add_data(data)
    qr.make(fit=True)
    
    # Create QR code with custom colors
    img = qr.make_image(fill_color="darkblue", back_color="lightblue")
    img.save(filename)
    print(f"Custom QR code saved as {filename}")
    return img

def generate_qr_with_logo(data, logo_path, filename="qr_with_logo.png"):
    """Generate QR code with a logo in the center"""
    qr = qrcode.QRCode(
        version=1,
        error_correction=qrcode.constants.ERROR_CORRECT_H,  # High error correction for logo
        box_size=10,
        border=4,
    )
    
    qr.add_data(data)
    qr.make(fit=True)
    
    img = qr.make_image(fill_color="black", back_color="white")
    
    # Add logo if provided
    if logo_path:
        try:
            logo = Image.open(logo_path)
            
            # Calculate logo size (should be about 1/5 of QR code size)
            qr_width, qr_height = img.size
            logo_size = min(qr_width, qr_height) // 5
            
            # Resize logo
            logo = logo.resize((logo_size, logo_size), Image.Resampling.LANCZOS)
            
            # Calculate position to center the logo
            logo_pos = ((qr_width - logo_size) // 2, (qr_height - logo_size) // 2)
            
            # Paste logo onto QR code
            img.paste(logo, logo_pos)
            
        except Exception as e:
            print(f"Error adding logo: {e}")
    
    img.save(filename)
    print(f"QR code with logo saved as {filename}")
    return img

# Example usage
if __name__ == "__main__":
    # Example 1: Basic QR code
    text_data = "Hello, World! This is a QR code generated with Python."
    generate_basic_qr(text_data, "basic_qr.png")
    
    # Example 2: URL QR code
    url_data = "https://www.python.org"
    generate_basic_qr(url_data, "url_qr.png")
    
    # Example 3: Custom colored QR code
    generate_custom_qr(text_data, "custom_qr.png")
    
    # Example 4: QR code with logo (uncomment if you have a logo file)
    # generate_qr_with_logo(url_data, "logo.png", "qr_with_logo.png")
    
    # Example 5: WiFi QR code
    wifi_data = "WIFI:T:WPA;S:YourNetworkName;P:YourPassword;;"
    generate_basic_qr(wifi_data, "wifi_qr.png")
    
    # Example 6: Contact information QR code (vCard format)
    contact_data = """BEGIN:VCARD
VERSION:3.0
FN:John Doe
ORG:Example Company
TEL:+1234567890
EMAIL:john.doe@example.com
URL:https://johndoe.com
END:VCARD"""
    generate_basic_qr(contact_data, "contact_qr.png")
    
    print("All QR codes generated successfully!")

# Advanced QR code with different error correction levels
def generate_qr_different_sizes():
    """Generate QR codes with different sizes and error correction levels"""
    data = "Python QR Code Generation Example"
    
    # Different error correction levels
    error_levels = {
        'L': qrcode.constants.ERROR_CORRECT_L,  # ~7% error correction
        'M': qrcode.constants.ERROR_CORRECT_M,  # ~15% error correction
        'Q': qrcode.constants.ERROR_CORRECT_Q,  # ~25% error correction
        'H': qrcode.constants.ERROR_CORRECT_H,  # ~30% error correction
    }
    
    for level_name, level_const in error_levels.items():
        qr = qrcode.QRCode(
            version=1,
            error_correction=level_const,
            box_size=8,
            border=4,
        )
        
        qr.add_data(data)
        qr.make(fit=True)
        
        img = qr.make_image(fill_color="black", back_color="white")
        filename = f"qr_error_level_{level_name}.png"
        img.save(filename)
        print(f"QR code with error correction level {level_name} saved as {filename}")

# Uncomment to generate QR codes with different error correction levels
# generate_qr_different_sizes()
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