如何在Python中循環我的2d數組？

Question

我有這個創建數組：

numbers = [] 
for num in range(0,5): 
     nums = [] 
     for inum in range(0,5): 
      nums.append(inum) 

     numbers.append(nums) 

如何循環？我用for item in len(numbers):它不起作用。 感謝

Answer 1

列表項是可迭代的，沒必要弄長，因爲他們將自己分配到與for..in結合第一可變..循環;

for item in numbers: 
    print "In first list: ", item 
    for num in item: 
     print " Getting number: ", num 

輸出

In first list: [0, 1, 2, 3, 4] 
    Getting number: 0 
    Getting number: 1 
    Getting number: 2 
    Getting number: 3 
    Getting number: 4 
In first list: [0, 1, 2, 3, 4] 
    Getting number: 0 
    Getting number: 1 
... 

Answer 2

for i in range(5): 
    for j in range(5): 
     print numbers[i][j] 

Answer 3

雙環：

for row in numbers: 
    for cell in row: 
     print cell, 
    print 

Answer 4

嘗試此。

[[col for col in range(5)] for row in range(5)]