支付宝某个鉴权文档中，有段 Java 代码样例，本人 Python 写的比较多, Java 不太熟，想转成 Python 代码

接主题，java 代码如下:

public String getCheckSum(String requestBody, String appSecret, String time) {

String md5Digest = MessageDigestUtils.md5Digest(requestBody); String checksum = MessageDigestUtils.sha1Digest(appSecret, md5Digest, time); return checksum; 

}

public class MessageDigestUtils {

private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; private MessageDigestUtils() { } public static String md5Digest(String input) { StringBuilder hexValue = new StringBuilder(); try { MessageDigest md5 = MessageDigest.getInstance("MD5"); byte[] md5Bytes = md5.digest(input.getBytes(StandardCharsets.UTF_8)); for (byte md5Byte : md5Bytes) { int val = ((int) md5Byte) & 0xff; if (val < 16) { hexValue.append("0"); } hexValue.append(Integer.toHexString(val)); } } catch (Exception e) { } return hexValue.toString(); } public static String sha1Digest(String appSecret, String nonce, String time) { String cOntent= appSecret + nonce + time; try { MessageDigest messageDigest = MessageDigest.getInstance("sha1"); messageDigest.update(content.getBytes()); return getFormattedText(messageDigest.digest()); } catch (Exception e) { throw new RuntimeException(e); } } private static String getFormattedText(byte[] bytes) { int len = bytes.length; StringBuilder buf = new StringBuilder(len * 2); for (int j = 0; j < len; j++) { buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]); buf.append(HEX_DIGITS[bytes[j] & 0x0f]); } return buf.toString(); } 

}