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how do I connect with salesforce with python requests?

Traceback error at the same time as connecting with salesforce api: ['message': 'INVALID_HEADER_TYPE', 'errorCode': 'INVALID_AUTH_HEADER']

What is the hassle?

My python codes are as follows:

client_id = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'

client_secret = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'

redirect_url = 'http://localhost/'

cm_user = 'XXXXXXXXXXXXXXXXXXXXXX'

cm_pass = 'XXXXXXXXXXXXXXXXXXXXXX'

auth_url = 'https://login.salesforce.com/services/oauth2/token'

response = requests.post(auth_url, data = {

    'client_id': client_id,

    'client_secret': client_secret,

    'grant_type':'password',

    'username': cm_user,

    'password': cm_pass

})

json_res = response.json()

access_token = json_res['access_token']

auth = {'Authorization': 'Bearer' + access_token}

instance_url = json_res['instance_url']

url = instance_url + '/services/data/v45.0/sobjects/contact/describe'

res = requests.get(url, headers=auth)

r = res.json()

print(r)