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\alpha_i=(1-\exp(-\sigma_i\delta_i))\text{ and }T_i=\prod_{j=1}^{i-1}(1-\alpha_i).

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import datetime
import json
import requests
from random import Random
import hashlib
SIMPLETEX_APP_ID = ""
SIMPLETEX_APP_SECRET = ""
def random_str(randomlength=16):
    str = ''
    chars = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789'
    length = len(chars) - 1
    random = Random()
    for i in range(randomlength):
        str += chars[random.randint(0, length)]
    return str
def get_req_data(req_data, appid, secret):
    header = {}
    header["timestamp"] = str(int(datetime.datetime.now().timestamp()))
    header["random-str"] = random_str(16)
    header["app-id"] = appid
    pre_sign_string = ""
    sorted_keys = list(req_data.keys()) + list(header)
    sorted_keys.sort()
    for key in sorted_keys:
        if pre_sign_string:
            pre_sign_string += "&"
        if key in header:
            pre_sign_string += key + "=" + str(header[key])
        else:
            pre_sign_string += key + "=" + str(req_data[key])
    pre_sign_string += "&secret=" + secret
    header["sign"] = hashlib.md5(pre_sign_string.encode()).hexdigest()
    return header, req_data
img_file = {"file": open("./image/02.png", 'rb')}
data = { } # 请求参数数据（非文件型参数），视情况填入，可以参考各个接口的参数说明
header, data = get_req_data(data, SIMPLETEX_APP_ID, SIMPLETEX_APP_SECRET)
res = requests.post("https://server.simpletex.cn/api/latex_ocr", files=img_file, data=data, headers=header)
print(json.loads(res.text))
pass

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{'status': True, 'res': {'latex': '\\alpha_i=(1-\\exp(-\\sigma_i\\delta_i))\\text{ and }T_i=\\prod_{j=1}^{i-1}(1-\\alpha_i).', 'conf': 0.9386832118034363}, 'request_id': 'tr_17453305716849140986868559936'}