How to append rows in a python list?

Question

I want to append a row in a python list.

Below is what I am trying,

# Create an empty array
arr=[]
values1 = [32, 748, 125, 458, 987, 361]
arr = np.append(arr, values1)
print arr

[ 32. 748. 125. 458. 987. 361.]

I want to append second row in the list, so that I will get an array like

[ [32. 748. 125. 458. 987. 361.], [42. 344. 145. 448. 187. 304.]]

I am getting error when I try to add second row

values2 = [42, 344, 145, 448, 187, 304]    
arr = np.append(arr, values2)

How to do that?

Hugo · Accepted Answer · 2020-02-20 11:22:58Z

12

Just append directly to your original list:

# Create an empty list
my_list = []
values1 = [32, 748, 125, 458, 987, 361]
my_list.append(values1)
print(my_list)

values2 = [42, 344, 145, 448, 187, 304]    
my_list.append(values2)
print(my_list)

And this will be your output:

[[32, 748, 125, 458, 987, 361]]
[[32, 748, 125, 458, 987, 361], [42, 344, 145, 448, 187, 304]]

Hope that helps!

edited Feb 20, 2020 at 11:22

answered Feb 27, 2017 at 8:01

Hugo

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