Try this:
alias get_deagle "weapon_deagle"
alias get_awp "weapon_awp"
bind kp_left get_deagle
bind kp_home get_awp
When you hit number 4 on the keypad the deagle gets loaded.
When you hit number 7 on the keypad the awp gets loaded.
I'm not totally sure that the names of the weapons are correct, so it may not work correctly. The command to pull out a weapon is: weapon_[weapon name]