Python Scripts Every Freelancer Needs in 2026 (Free Code Included)

Why Every Freelancer Should Learn Python (Even If You're Not a Developer)

You don't need to be a developer to benefit from Python automation. With 10 lines of code, you can automate tasks that waste hours every week.

1. Auto-Generate PDF Invoices

Stop creating invoices manually in Word. This script generates a professional PDF invoice in 30 seconds:

pip install fpdf2

from fpdf import FPDF
import datetime

def invoice(client, amount, desc, invoice_num):
    pdf = FPDF()
    pdf.add_page()
    pdf.set_font('Helvetica', 'B', 24)
    pdf.cell(0, 15, 'INVOICE', align='C', new_x='LMARGIN', new_y='NEXT')
    pdf.set_font('Helvetica', '', 12)
    pdf.cell(0, 8, f'Invoice #{invoice_num}  |  Date: {datetime.date.today()}', new_x='LMARGIN', new_y='NEXT')
    pdf.cell(0, 8, f'Bill to: {client}', new_x='LMARGIN', new_y='NEXT')
    pdf.ln(5)
    pdf.set_font('Helvetica', 'B', 14)
    pdf.cell(0, 10, f'Total Due: EUR{amount:.2f}', new_x='LMARGIN', new_y='NEXT')
    pdf.set_font('Helvetica', '', 11)
    pdf.cell(0, 8, f'Services: {desc}', new_x='LMARGIN', new_y='NEXT')
    pdf.output(f'invoice_{invoice_num}.pdf')
    print(f'Invoice saved as invoice_{invoice_num}.pdf')

invoice('Acme Corp', 2500.00, 'Web Development - April 2026', 42)

2. CSV to Excel Report Generator

pip install openpyxl pandas

import pandas as pd

def csv_to_report(csv_file, output_file):
    df = pd.read_csv(csv_file)
    
    with pd.ExcelWriter(output_file, engine='openpyxl') as writer:
        df.to_excel(writer, sheet_name='Data', index=False)
        
        # Auto-width columns
        ws = writer.sheets['Data']
        for col in ws.columns:
            max_len = max(len(str(cell.value or '')) for cell in col)
            ws.column_dimensions[col[0].column_letter].width = min(max_len + 2, 40)
    
    print(f'Report saved: {output_file}')

csv_to_report('clients.csv', 'client_report.xlsx')

3. Bulk Email Personalizer

import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
import csv

def send_bulk_emails(csv_file, gmail_address, gmail_password):
    contacts = []
    with open(csv_file) as f:
        reader = csv.DictReader(f)
        contacts = list(reader)  # needs: name, email, company columns
    
    server = smtplib.SMTP_SSL('smtp.gmail.com', 465)
    server.login(gmail_address, gmail_password)
    
    for contact in contacts:
        msg = MIMEMultipart()
        msg['From'] = gmail_address
        msg['To'] = contact['email']
        msg['Subject'] = f"Quick question for {contact['company']}"
        
        body = f"""Hi {contact['name']},
        
I noticed {contact['company']} recently...

Best,
Your Name"""
        
        msg.attach(MIMEText(body, 'plain'))
        server.send_message(msg)
        print(f'Sent to {contact["email"]}')
    
    server.quit()

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