列表列表进入numpy数组-错误的输出

Question

I am pretty new to Python, I have a list of lists, which when printed this is the following output, lets call it list1:

[['2012-09-01', '25,922'], ['2013-09-01', '41,733'], ['2014-09-01', '37,037'], ['2015-09-01', '39,510'], ['2016-09-01', '53,394']]

Then I am converting to a numpy array, just like in this thread List of lists into numpy array

and when I do:

print(numpy.array(list1))

I get the following output:

[['2012-09-01' '25,922']
 ['2013-09-01' '41,733']
 ['2014-09-01' '37,037']
 ['2015-09-01' '39,510']
 ['2016-09-01' '53,394']]

I was expecting the same output as the previous one, just like in the other thread. What stupid thing am I doing here?

When I print both types of the lists I get the following output:

<class 'list'>
<class 'numpy.ndarray'>

So its seems to be doing the right thing.

Thank you!

Answer 1

The outputs are essentially same, the only difference is python prints list in one format and array in another. But if you want to see a list -like output, you can do the following:

print(numpy.array(list1).tolist())

Though it doesn't make sense to me because you are converting the list to array and want to print in list -like format.

Answer 2

That is just how numpy arrays are printed. The list is still the same eg.

print(numpy.array(list1)[0][1])

and

print(list1[0][1])

are the same.