将12小时转换为24小时python将24:00:00显示为24:00:00，而不是00:00:00

def convert_to_24h(time_str):
    if time_str[-2:] == "AM" and time_str[:2] == "12":
        return "00" + time_str[2:-2]
    elif time_str[-2:] == "AM":
        return time_str[:-2]
    elif time_str[-2:] == "PM" and time_str[:2] == "12":
        return time_str[:-2]
    else:
        return str(int(time_str[:2]) + 12) + time_str[2:8]

time_12h = "12:00:00 PM"
time_24h = convert_to_24h(time_12h)
print(time_24h)