import gspread

service_account = gspread.service_account(filename="credentials.json")
sheet = service_account.open("Problems")

wks = sheet.worksheet("Sheet1")
wks.update_cell(3,1, 'hello')
cell_list = wks.range('A1:B1')
cell_list[0].value = 'avatiach'
cell_list[1].value = 'mango'
wks.update_cells(cell_list)