I am trying to convert list of list to LIST using robot framework keywords.Output of my script in log file was like this :
@{ListA} = [ [a, b] | [c, d, e] | f | g]
I wanted to flatten this list as
[ a , b , c , d , e , f , g]
How to convert this?
Any suggestions would be helpful. Thanks.
List comprehensions are quite powerful, and can be used with the Evaluate keyword. Here you can force each item to be a list by checking to see if it already is - the "(sublist if isinstance(sublist, list) else [sublist])" part. Once you have a list of lists, you can flatten that with the nesting ability of a list comprehension.
Some folks frown upon type-checking in Python, but one of the struggles is that strings and lists can be mistaken. Here a direct type-check is used. There are other approaches to check if an object is a list and you can modify this as needed.
List of lists and Other Items
@{InnerA} Create List a b
@{InnerB} Create List c d e
@{ListA} Create List ${InnerA} ${InnerB} f g
${flat} Evaluate [item for sublist in $ListA for item in (sublist if isinstance(sublist, list) else [sublist])]
Log List ${flat}
_
INFO : @{InnerA} = [ a | b ]
INFO : @{InnerB} = [ c | d | e ]
INFO : @{ListA} = [ [u'a', u'b'] | [u'c', u'd', u'e'] | f | g ]
INFO : ${flat} = [u'a', u'b', u'c', u'd', u'e', u'f', u'g']
INFO :
List length is 7 and it contains following items:
0: a
1: b
2: c
3: d
4: e
5: f
6: g
"[ (a,b), ...]". Do you have an actual list-of-lists, or do you literally want to transform this string to a list of lists, and then flatten it out?