class_docstr: Simple implementation of CredentialProvider that just wraps static
  username and password.
code: def __init__(
      self,
      username: Optional[str] = None,
      password: Optional[str] = None,
  ):
      self.username = username or ""
      self.password = password or ""
  
imports: from typing import Optional, Tuple, Union
label_desc: Use image node_id 1 to create a new UsernamePasswordCredentialProvider object from inherited base classes: CredentialProvider with example: obj = UsernamePasswordCredentialProvider(username, password)