Python eval（）函數(shù)報錯

jack_yanf

#!/usr/bin/env  python

def leastCoin(coinNum):
      coin = [25,10,5,1]
      coinN = []
      for item in coin:
           coinN.append(eval(coinNum) / item)
           coinNum = eval(coinNum)% item
      return coinN

if __name__ == "__main__":
    coin = raw_input('Enter your coin num,Please!')
    coinN = leastCoin(coin)
    print 'The least coin for %d is 25:%d,10:%d,5:%d,1:%d' %(coin,coinN[0],coinN[1],coinN[2],coinN[3])
大神們給看看，運行的時候報錯

本人剛剛接觸python不久，問的問題可能過于簡單，不過希望各位大神能夠耐心的幫我解惑下，萬分感謝。

haooooaaa

你這個直接用 int  就可以了，

eval（） 括號里面要表達(dá)式或者是變量名字符

比如  eval(2+3)

jack_yanf

回復(fù) 2# haooooaaa
用了int 好像不行，如果要輸入float類型的也不行的吧，  eval()里面也是表達(dá)式呀，是取余和取摸呀


   

Linux_manne

完全不明白你要干嘛....

substr函數(shù)

好像行的吧

1. Enter your coin num,Please! 56
   
2. The least coin for 56 is
   
3. 
   
4. [(25, 2), (10, 0), (5, 1), (1, 1)]

復(fù)制代碼

1. def leastCoin(coinNum):
   
2.     coin = [25, 10, 5, 1]
   
3.     coinN = []
   
4.     for item in coin:
   
5.         coinN.append(coinNum / item)
   
6.         coinNum = coinNum % item
   
7.     return zip(coin, coinN)
   
8. 
   
9. 
   
10. coin = input('Enter your coin num,Please! ')
    
11. result = leastCoin(coin)
    
12. 
    
13. print 'The least coin for %d is\n' % coin
    
14. print result

復(fù)制代碼