web简易计算器

from pywebio import start_server
from pywebio.output import *
from pywebio.pin import *
from pywebio.input import *
from pywebio import pin as pin
from pywebio.output import *
from pywebio.session import hold

# 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="172.16.0.230", port=2022)

def JiShuan_ui():
    put_markdown(" # ***简易计算器*** \n ## 输入计算表达式：\n ### （*请注意*：要在英文状态下输入！）")
    pin.put_input("exp",label="",type=TEXT)
    put_buttons(["计算"],onclick=[JiShuan])

def JiShuan():
    exp = pin.pin["exp"]
    if exp != "":
        with use_scope("a",clear=False):    #clear的值为Ture时，清除输出的计算结果，显示新的计算结果，值为False 时保留原计算结果。
            put_text(exp,"=",eval(exp))
    else:
        toast("🔔 表达式不能为空")

if __name__ == '__main__':
    JiShuan_ui()