可以使用基础认证来代替OAuth2进行API调用。需要在请求头中添加Authorization字段，并将其设置为“Basic 'base64-encoded credentials'”，其中'base64-encoded credentials'是使用Base64编码的用户名和密码字符串。示例代码如下：

import requests
import base64

username = 'your_username'
password = 'your_password'
endpoint_url = 'https://example.com/api/followers'

# encode credentials with Base64
credentials = username + ':' + password
encoded_credentials = base64.b64encode(credentials.encode('ascii')).decode('ascii')

# make request with Basic Authentication
headers = {
    'Authorization': 'Basic ' + encoded_credentials
}

response = requests.get(endpoint_url, headers=headers)
followers_count = response.json()['followers_count']
print(followers_count)

请确保将实际的用户名，密码和端点URL替换为示例中的值。