Specify default arguments for Ansible playbook
That's what the configuration file is for. Create an ansible.cfg in the directory from where you run ansible, like so:


[defaults]
inventory = hosts
ask_vault_pass = True

[privilege_escalation]
become_ask_pass = True


See also http://docs.ansible.com/ansible/latest/reference_appendices/config.html

The ansible.cfg in the working directory precedes /etc/ansible/ansible.cfg. The full search order is described on the page linked above. Command line options you pass on invocation override all configuration files.