url_auth = 'http://www.example.com/api'
user = 'xxxx'
password = 'xxxxx'
headers_json = {'Content-Type': 'application/json'}
body = {'Username': user,'Password': password}
r = requests.post(url_auth, headers=headers_json, json=body)
response = json.loads(r.content)
print response
token = response['jwt']

{u'jwt': u'349fifnr9t84ugjfof'}

url_update = 'http://www.example.com/api/endpoints/1/stacks'
header_token = {'Authorization': 'Bearer %s' % (token)}
r = requests.get(url_update, headers=header_token)
id_response = json.loads(r.content)
print id_response
id_stack = id_response['Id']

[{u'Name': u'xxx', u'ProjectPath': u'/data/compose/xxx', u'ResourceControl': {u'ResourceId': u'xxx', u'UserAccesses': [], u'AdministratorsOnly': True, u'TeamAccesses': [], u'SubResourceIds': [], u'Type': 6, u'Id': 5}, u'EntryPoint': u'docker-compose.yml', u'Env': None, u'SwarmId': u'e037bv0ejcme0p', u'Id': u'xxx_e037bv0ejcme0p'}]

id_stack = id_response['Id']
TypeError: list indices must be integers, not str

id_response = [{u'Name': u'xxx', u'ProjectPath': u'/data/compose/xxx', u'ResourceControl': {u'ResourceId': u'xxx', u'UserAccesses': [], u'AdministratorsOnly': True, u'TeamAccesses': [], u'SubResourceIds': [], u'Type': 6, u'Id': 5}, u'EntryPoint': u'docker-compose.yml', u'Env': None, u'SwarmId': u'e037bv0ejcme0p', u'Id': u'xxx_e037bv0ejcme0p'}]
for i in id_response:
    print(i["Id"])