Building a Simple Web Calculator with PyWebIO and Packaging with PyInstaller

The article demonstrates how to create a simple web-based calculator using the Python library pywebio , showing installation commands, the full source code, and how to run it locally.

Installation: pip install pyinstaller and pip install pywebio .

Main program code:

from pywebio import start_server
from pywebio.output import *
from pywebio.pin import *

def calc(exp):
    try:
        return f"{exp}={eval(exp)}"
    except:
        return f"{exp}:表达式不正确"

def refresh(exp):
    out = calc(exp)
    with use_scope("aa", clear=True):
        put_text(out)

def webmain():
    put_markdown("## 简易计算器 \n 输入计算表达式：")
    put_input("res")
    put_buttons(["计算"], lambda _: refresh(pin.res))

start_server(webmain, host="127.0.0.1", port=2022)

Running the script and opening http://127.0.0.1:2022/ in a browser displays the calculator interface.

Deployment options include copying the script to a server, or packaging it into a standalone executable with PyInstaller using commands such as pyinstaller -F main.py -i icon.ico and handling the generated main.exe .

The guide concludes that pywebio enables rapid development of small interactive tools, and pyinstaller simplifies distribution.