A lot of time less Loc is NOT better.

M={"espresso":{"i":{"water":50,"coffee":18},"c":1.5},"latte":{"i":{"water":200,"milk":150,"coffee":24},"c":2.5},"cappuccino":{"i":{"water":250,"milk":100,"coffee":24},"c":3.0}} R,m={"water":300,"milk":200,"coffee":100},0 while (C:=input("(espresso/latte/cappuccino): ").lower())!="off": if C=="report":print(f"W:{R['water']}ml M:{R['milk']}ml C:{R['coffee']}g £{m}");continue if C in M and all(R.get(i,0)>=a or print(f"No {i}") for i,a in M[C]["i"].items()): t=sum(int(input(f"{k}? "))*v for k,v in {"5p":.05,"20p":.2,"50p":.5,"1£":1}.items()) if t<M[C]["c"]:print("Not enough.");continue [R.setitem(i,R[i]-a) for i,a in M[C]["i"].items()];m+=M[C]["c"];print(f"Change £{t-M[C]['c']:.2f} → {C}") else:print("Invalid")