CODEWITHSUNDEEP
pythonlistlist-comprehension
user7245782
user7245782

Reputation:

Convert a list of integers into a string with just one comma after x elements in Python

I am trying to convert for example this list 

F=[6, 9, 4, 3, 6, 8]

into a string that looks like this:

"6 9 4, 3 6 8"

the comma after 3 elements in this case is from the length of tuples in another list.

Can't figure out how to do this, I'll be grateful for any help!

Thank you!

Edit: Okay so I am trying to write a progam that "multiplies" to matrizes by adding the elements and finding the minimum. (ci,j = min {ai,k + bk,j})

What I got so far is 

A="4 3 , 1 7"
B="2 5 9, 8 6 1"

A1 = A.split(",")
B1 = B.split(",")
A2 = [tuple(int(y) for y in x.split()) for x in A1]
B2 = [tuple(int(y) for y in x.split()) for x in B1]

D = []
for k in range(len(A2)):
    for j in range(len(B2[0])):
        C = []
        for i in range(len(A2[0])):
            N = (A2[k][i] + B2[i][j])
            C.append(N)
        D.append((min(C)))

So what I wrote gives me the right numbers, but in a list. I tried some codes from the internet but it won't work. The given strings A and B can be matrices of nxm so that I can't just cut the list to two pieces and add them together.

Thank you!

Upvotes: 1

Views: 75

Answers (5)

Moinuddin Quadri
Moinuddin Quadri

Reputation: 48067

You may also use list comprehension expression using zip as:

>>> my_list = [6, 9, 4, 3, 6, 8]
>>> n = 3
>>> ', '.join([' '.join(map(str, x)) for x in zip(*[my_list[i::n] for i in range(n)])])
'6 9 4, 3 6 8'

Upvotes: 2

trincot
trincot

Reputation: 350167

I would suggest this:

F=[6, 9, 4, 3, 6, 8, 9, 10]
size = 3

s = ', '.join([' '.join(map(str, F[i:i+size])) for i in range(0, len(F), size)])

Upvotes: 0

Mohammad Yusuf
Mohammad Yusuf

Reputation: 17064

Ok. 1 with regex also :)

import re

f = [6, 9, 4, 3, 6, 8]
a = re.sub(r"[\[\],]",r"", ''.join(str(f)))
print "\""+a[:5]+','+a[5:]+"\""

Output:

"6 9 4, 3 6 8"

Upvotes: 0

LMc
LMc

Reputation: 18632

One liner: 

' '.join([str(i) if c != 3 else str(i)+', ' for c,i in enumerate(F,start=1)])

This will join all the elements by a space, adding a comma after the third element. Change the 3 in the line if you want to add the comma after a different element. The enumerate function is counting the number of elements in F with the index starting at 1.

The join string method will concatenate all elements of your list by ' ' (space).

Upvotes: 1

Aakash Makwana
Aakash Makwana

Reputation: 754

you can try below code:

F=[6, 9, 4, 3, 6, 8]
len_other_list = 3
F1 = F[:len_other_list]
F2 = F[len_other_list:]
reqd_string = ' '.join(map(str, F1))+', '+' '.join(map(str, F2))

Upvotes: 2

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