Python程序，以從用戶的輸入，轉換英里公里

Question

這裏是我到目前爲止的代碼，當我運行它，我得到一個語法錯誤，我不知道爲什麼

#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()功能後沒有添加:標誌 應該

#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() 

這裏是結果：