Try using an OpenSSL for Python library like "pyOpenSSL"
https://pyopenssl.org/en/stable/api/crypto.html#pkcs12-objects
from OpenSSL import crypto
p12 = crypto.load_pkcs12(file("push.p12", 'rb').read(), [password])
# PEM formatted private key
print crypto.dump_privatekey(crypto.FILETYPE_PEM, p12.get_privatekey())
# PEM formatted certificate
print crypto.dump_certificate(crypto.FILETYPE_PEM, p12.get_certificate())
from here.