CODEWITHSUNDEEP
pythonlist
Ali Bhaiwala
Ali Bhaiwala

Reputation: 3

Boundaries when printing list of lists

I have the following code:

matrix = [[0, 0, 1, 0], [1, 1, 0, 0], [0, 0, 0, 1], [1, 0, 0, 1]]

I am able to print every line as follows using this:

for i in matrix:
    print(*i)

outputting:

0 0 1 0
1 1 0 0
0 0 0 1
1 0 0 1

I want to create custom boundaries for each line and I am able to do so with by manually adding the boundaries to the list of list as shown below:

for k in range(0,columns):
    matrix[k].insert(0,'[')
    matrix[k].insert(columns+1,']')

giving me the output as desired:

[ 0 0 1 0 ]
[ 1 1 0 0 ]
[ 0 0 0 1 ]
[ 1 0 0 1 ]

Is there a better way to do this, particularly without having to add the boundaries into my list?

Upvotes: 0

Views: 67

Answers (4)

A l w a y s S u n n y
A l w a y s S u n n y

Reputation: 38502

Another way with simple list to str casting and replacing all the commas with nothing like below-

matrix = [[0, 0, 1, 0], [1, 1, 0, 0], [0, 0, 0, 1], [1, 0, 0, 1]]
for i in matrix:
    print(str(i).replace(',',''))

DEMO: https://rextester.com/QESAJC13339

Upvotes: 0

John Coleman
John Coleman

Reputation: 51998

for row in matrix:
    print(row)

almost does what you want, but it has commas. Replace those commas by nothing:

for row in matrix:
    print(str(row).replace(',',''))


[0 0 1 0]
[1 1 0 0]
[0 0 0 1]
[1 0 0 1]

Even this isn't quite what your target is, but in mathematical type-setting it is not customary to pad the boundaries of a matrix with white space.

Upvotes: 0

Tim Roberts
Tim Roberts

Reputation: 54698

for row in matrhx:
    print( '[ ' + ' '.join(str(j)) + ' ]' )

Upvotes: 0

Mario Khoury
Mario Khoury

Reputation: 392

Yes you can do it with two for loop like that

for i in matrix:
    s = "["
    for j in i:
        s = s + str(j) + " " 
    s = s + "]"
    print(s)

Or you can still do it with 1 for loop like that

for i in matrix:
    print("[", *i, "]")

Upvotes: 1

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