python - 为什么我得到错误不能将序列乘以类型为 'float' 的非整数 PYTHON

Question

我写了一个简单的程序来计算一些电子零件的税，它是这样的:

print "How much does it cost?",    
price = raw_input()    
print "Tax: %s" % (price * 0.25)    
print "Price including tax: %s" % (price * 1.25)    
raw_input ("Press ENTER to exit")

而且我一直收到这个错误:

Traceback (most recent call last):
  File "moms.py", line 3, in <module>
    print "Tax: %s" % (price * 0.25)
TypeError: can't multiply sequence by non-int of type 'float'

Answer 1

您需要先将 raw_input() 返回的字符串转换为 float:

price = float(raw_input("How much does it cost?")) # no need for extra print