How to print list elements (which are also lists) in separated lines in Python

Question

I've checked the post and answers on the SO post Printing list elements on separated lines in Python, while I think my problem is a different one.

What I want is to transform:

lsts = [[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1]]

into the output like below:

[[1],
[1, 1],
[1, 2, 1],
[1, 3, 3, 1],
[1, 4, 6, 4, 1]]

I tried append, print in the for loop and "\n".join() but all failed.

Answer 1

Here's an adaptation of that same idea:

output = "[" + ",\n".join(str(i) for i in lsts) + "]"

Answer 2

print ']\n'.join(str(lsts).split('],'))

This is gross but does what you want it to.

for l in lsts:
    print l

almost does except you miss the first and last brackets. so you could do

list_len = len(lsts)
for i in range(list_len):
    if i == 0:
        print '['+str(lsts[i])
    elif i == list_len - 1:
        print str(lsts[i]( +']'
    else:
        print lists[i]

Answer 3

Try this:

lsts = [[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1]]
print('[',end='')
for i,value in enumerate(lsts):
    print(value,end='')
    if i == len(lsts)-1:
        print(']')
    else:
        print(',')

Output:

[[1],
[1, 1],
[1, 2, 1],
[1, 3, 3, 1],
[1, 4, 6, 4, 1]]

Answer 4

You can try this if the form of lsts is fixed:

>>> print '['+'\n'.join([ str(i) for i in lsts ]) + ']'  

[[1]  
[1, 1]  
[1, 2, 1]  
[1, 3, 3, 1]  
[1, 4, 6, 4, 1]]  

Answer 5

To achieven exactly what you want, you could manually unroll and print the outer array like already suggested:

>>> lsts = [[1], [2,3], [4, 5, 6]]
>>> print("[" + ",\n".join(str(i) for i in lsts) + "]")
[[1],
[2, 3],
[4, 5, 6]]

Not exactly what you requested, but json.dumps can do some pretty-printing by specifying an indent:

>>> print(json.dumps(lsts, indent=4))
[
    [
        1
    ],
    [
        2,
        3
    ],
    [
        4,
        5,
        6
    ]
]

And then there's pprint, which is intended for somewhat intelligent printing for humans:

>>> pprint(lsts, width=20)
[[1],
 [2, 3],
 [4, 5, 6]]