python - 类型错误 : not all arguments converted during string formatting python 3

Question

计算机科学类(class)的弹道计算器。我不明白为什么它一直显示以下错误消息:

travel_time = range % velocity
TypeError: not all arguments converted during string formatting


print ("Welcome to the Laird Industries Ballistic Calculator")
range = raw_input("What is the approximate distance to your target? (m)")
velocity = raw_input("What is the muzzle velocity of the projectile? ")

def time_to_target():
    travel_time = range % velocity
    print "Travel duration {0}".format(travel_time)
#
time_to_target()
#

感谢您提供信息。固定代码:

range_to_target = raw_input("What is the approximate distance to your target? (m)")
velocity = raw_input("What is the muzzle velocity of the projectile? ")

def time_to_target():
    travel_time = float(range_to_target) / float(velocity)
    print "Travel duration {0}".format(travel_time)
#
time_to_target()
#

Answer 1

因为 range 是一个字符串(你从 input() 得到的)而 % 在 Python 中对于字符串是一个特殊的格式化运算符.您只需要转换为数字数据类型，如下所示:

travel_time = float(range) % float(velocity)