如何使用查找表来缩短这段代码？

def get_weekday_name(day):
    if day == 1:
        return "Monday"
    elif day == 2:
        return "Tuesday"
    elif day == 3:
        return "Wednesday"
    elif day == 4:
        return "Thursday"
    elif day == 5:
        return "Friday"
    elif day == 6:
        return "Saturday"
    elif day == 7:
        return "Sunday"
    else:
        return "Invalid day"

# 使用查找表来缩短代码
def get_weekday_name_lookup(day):
    weekdays = {
        1: "Monday",
        2: "Tuesday",
        3: "Wednesday",
        4: "Thursday",
        5: "Friday",
        6: "Saturday",
        7: "Sunday"
    }
    return weekdays.get(day, "Invalid day")