I have this data-frame and changes that i want with the data-frame's series are mentioned within the brackets :
date(first case) project_name(use distinct name) billed_amount(apply sum)
16-aug project-1 500
16-aug project-1 100
17-aug project-2 1000
17-aug project-2 100
I want new Data-frame to be like below
date project_name billed_amount
16-aug project-1 600
17-aug project-2 1100
Is this Possible with Pandas??