Format Turkish Numbers when you have a list of entered phone numbers in various format. Use this to make all same.

format_tr_numbers.py

import re

def format_phone_number(phone):
    # Remove all non-digit characters
    digits = re.sub(r'\D', '', phone)
    
    # If number starts with 0, remove it
    if digits.startswith('0'):
        digits = digits[1:]
    
    # If number doesn't start with 90, add it
    if not digits.startswith('90'):
        digits = '90' + digits
    
    # Check if the final number has the correct length (12 digits)
    if len(digits) == 12:
        return digits
    return None

def process_file(input_file, output_file):
    formatted_numbers = set()  # Using set to remove duplicates
    
    with open(input_file, 'r', encoding='utf-8') as f:
        for line in f:
            line = line.strip()
            if line:  # Skip header lines
                formatted = format_phone_number(line)
                if formatted:
                    formatted_numbers.add(formatted)
    
    # Sort and write unique formatted numbers
    with open(output_file, 'w', encoding='utf-8') as f:
        for number in sorted(formatted_numbers):
            f.write(number + '\n')
    
    return len(formatted_numbers)

# Process the file
input_file = 'numbers.txt'
output_file = 'formatted_numbers.txt'
count = process_file(input_file, output_file)
print(f"İşlem tamamlandı. {count} adet geçerli numara bulundu.")

# w/ Claude 3.5 Sonnet