在python中浮动字符串时遇到问题

Question

我的目标是创建一个将度数转换为弧度的程序.公式是(度*3.14)/ 180.但是python不断给我这个错误:

Traceback (most recent call last):
  File "2.py", line 6, in <module>
    main()
  File "2.py", line 4, in main
    degrees = (degrees * 3.14) / 180
TypeError: can't multiply sequence by non-int of type 'float'

从这段代码:

def main():
    degrees = raw_input("Enter your degrees: ")
    float(degrees)
    degrees = (degrees * 3.14) / 180

main()

编辑:谢谢大家的帮助!

Answer 1

float(degrees) 

什么都不做 或者说,它从字符串输入度开始浮动,但不会将其放在任何位置,因此度数保持字符串.这就是TypeError所说的:你要求它将字符串乘以3.14.

degrees = float(degrees)

会做的.

顺便说一下,在数学模块中已经有了在度和弧度之间转换的函数:

>>> from math import degrees, radians, pi
>>> radians(45)
0.7853981633974483
>>> degrees(radians(45))
45.0
>>> degrees(pi/2)
90.0