Implementing SMS Verification Code with Python and Tencent Cloud SMS SDK

Many websites and mobile apps require phone‑number verification; this guide shows how to implement an SMS verification code feature using Python and the Tencent Cloud SMS service.

Prerequisites

Operating System: macOS Python >= 3.6.2 Tencent Cloud SMS personal account (free 100 messages per month)

Installation

pip3 install qcloudsms_py

After installing the SDK, you must create an application in the Tencent Cloud SMS console to obtain the appid and appkey , then apply for a message signature and a template. The template may contain placeholders such as {1} that will be filled with the verification code.

Code implementation

The following Python class encapsulates the whole process:

import random
from qcloudsms_py import SmsSingleSender
from qcloudsms_py.httpclient import HTTPError

class Captcha():
    def create_captcha(self):
        """Create and return a six‑digit verification code"""
        captcha = ''
        for i in range(6):
            now_number = str(random.randint(0, 9))
            captcha += now_number
        return captcha

    def create_ssender(self):
        """Create an SmsSingleSender object"""
        appid = ******          # replace with your appid
        appkey = '******'       # replace with your appkey
        ssender = SmsSingleSender(appid, appkey)
        return ssender

    def send_short_message(self, phone_number):
        """Send the verification code via SMS"""
        ssender = self.create_ssender()
        params = []
        captcha = self.create_captcha()
        defult_time = "2"
        params.append(captcha)
        params.append(defult_time)
        template_id = ******    # replace with your template ID
        sms_sign = '******'     # replace with your signature
        try:
            result = ssender.send_with_param(86, phone_number, template_id, params, sign=sms_sign, extend="", ext="")
            return result['result']
        except HTTPError as e:
            print(e)
        except Exception as e:
            print(e)

Replace the placeholders marked with asterisks with the values obtained from the Tencent Cloud console. The send_short_message method builds the parameter list according to the template placeholders, sends the SMS, and returns the result code for further handling.

By following these steps you can quickly add phone‑based verification to your web or mobile application.