在Python中输入多于1个列表的最佳方法是什么？

Question

我需要把用户的输入像列表：

11 20 
22 30 
32 45 
34 54 
.. .. 

我想：

for i in range(n): 
    c, d = map(int, input().split()) 
    a.append(c) 
    b.append(d) 

是否有比这更好的办法？

Answer 1

这可能是你想要什么：

ins = [input("Two integers separated by a whitespace: ") for _ in range(n)] 
a, b = [int(i.split()[0]) for i in ins], [int(i.split()[1]) for i in ins] 

考虑例外，我觉得代码下面是更好的：

tip = "Enter two integers separated by a whitespace: "  
while n > 0: 
    try: 
     c, d = map(int, input(tip).split()) 
     n -= 1 
     a.append(c) 
     b.append(d) 
    except: 
     print('invalid input!\n') 

Answer 2

只需要一些用户提示和验证。只要抓住ValueError异常会做到这一点...

for i in range(n): 
    while True: 
     try: 
      c, d = map(int, input("enter 2 numbers separated by whitespace").split()) 
      break 
     except ValueError: 
      print("Try again...\n") 
    a.append(c) 
    b.append(d) 

结果解释：

>>> n = 10 
>>> a = [] 
>>> b = [] 
>>> for i in range(n): 
     while True: 
      try: 
       c, d = map(int, input("enter 2 numbers separated by whitespace: ").split()) 
       break 
      except ValueError: 
       print("Try again...\n") 
     a.append(c) 
     b.append(d) 
... ... ... ... ... ... ... ... ... 
enter 2 numbers separated by whitespace: 1 2 
enter 2 numbers separated by whitespace: 5 
Try again... 

enter 2 numbers separated by whitespace: 5 6 
enter 2 numbers separated by whitespace: 10 11 
enter 2 numbers separated by whitespace: 3112 3232 
enter 2 numbers separated by whitespace: 1111 
Try again... 

enter 2 numbers separated by whitespace: 323 333 
enter 2 numbers separated by whitespace: 324 334 
enter 2 numbers separated by whitespace: 1 1 
enter 2 numbers separated by whitespace: 2 2 
enter 2 numbers separated by whitespace: 3 3 
enter 2 numbers separated by whitespace: 4 4 
>>> a 
[1, 5, 10, 3112, 323, 324, 1, 2, 3, 4] 
>>> b 
[2, 6, 11, 3232, 333, 334, 1, 2, 3, 4] 
>>>