shc_jws.py

shc_jws.py

import base64

def decode(data):
  missing_padding = len(data) % 4
  if missing_padding:
      data += b'='* (4 - missing_padding)
  return base64.urlsafe_b64decode(data)

jws_parts = list(map(decode, jws.split(".")))

print("header:", jws_parts[0])
# header: {"zip":"DEF","alg":"ES256","kid":"..."}

With python 3.9.6 it seems you need data += str(b'='* (4 - missing_padding))
to avoid TypeError: can only concatenate str (not "bytes") to str