Python程序，以从用户的输入，转换英里公里

Question

这里是我到目前为止的代码，当我运行它，我得到一个语法错误，我不知道为什么

#input from the user 
def main() 
miles = float(input("Enter a distance in miles: ")) 


conv_fac = 1.609 #conversion factor 

#calculating how many kilometers 
kilometers = miles * conv_fac 


print("The distance in kilometers is: ", kilometers) 

main() 

Answer 1

你在main()功能后没有添加:标志 应该

#input from the user 
def main(): 
    miles = float(input("Enter a distance in miles: ")) 
    conv_fac = 1.609 #conversion factor 
    #calculating how many kilometers 
    kilometers = miles * conv_fac 
    print("The distance in kilometers is: ", kilometers) 

main() 

这里是结果：