CODEWITHSUNDEEP
pythonpython-3.x
Sachin S
Sachin S

Reputation: 396

Python How to print list of list

I want to print list of list in python 3.x with below code, but it is giving an error.

lol=[[1,2],[3,4],[5,6],['five','six']]
for elem in lol:
      print (":".join(elem))
# this is the error I am getting-> TypeError: sequence item 0: expected str instance, int found

I am expecting this output:

1:2
3:4
5:6
five:six

I could achieve the same output using below perl code (this is just for reference):

for (my $i=0;$i<scalar(@{$lol});$i++)
{
    print join(":",@{$lol->[$i]})."\n";
}

How do I do it in python 3.x?

Upvotes: 1

Views: 883

Answers (3)

Jon Clements
Jon Clements

Reputation: 142106

I'd go for:

for items in your_list:
    print (*items, sep=':')

This takes advantage of print as a function and doesn't require joins or explicit string conversion.

Upvotes: 7

oleg
oleg

Reputation: 4182

One can't join int's only strings. You can Explicitly cast to str all your data try something like this

for elem in lol:
    print (":".join(map(str, elem)))

or with generator

for elem in lol:
    print (":".join(str(i) for i in elem))

or You can use format instead of casting to string (this allows You to use complex formatting)

for elem in lol:
    print (":".join("'{}'".format(i) for i in elem))

Upvotes: 3

Ashwini Chaudhary
Ashwini Chaudhary

Reputation: 250871

Use a list comprehension and str.join:

Convert the integers to string(using str()) before joining them

>>> lis = [[1,2],[3,4],[5,6],['five','six']]
>>> print ("\n".join([ ":".join(map(str,x))   for x in lis]))
1:2
3:4
5:6
five:six

or:

>>> print ("\n".join([ ":".join([str(y) for y in x])   for x in lis]))
1:2
3:4
5:6
five:six

Upvotes: 1

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