I currently have a list like this:
[3, 4, ['x', 'y', 'z'], 5]
and want to make it to
[3, 4, 'x', 'y', 'z', 5]
New beginner at this, and tried searching around, but couldn't find anything I could understand.
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Philip Kirkbride
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Just google `flatten list of lists in python`. Definitely a duplicate. – sisanared Oct 16 '16 at 04:21
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Why doesn't your attempt to solve it work? Maybe we can help with that. – wwii Oct 16 '16 at 04:47
1 Answers
0
l=[3, 4, ['x', 'y', 'z'], 5]
nl=[]
for x in l:
if not isinstance(x,int):
for y in x:
nl.append(y)
else:
nl.append(x)
print(nl)
One liner
l=[3, 4, ['x', 'y', 'z'], 5]
nl=[];[nl.extend([x] if isinstance(x,int) else x) for x in l]
It is not flatening list of list because the given one is combination of list and int
Smart Manoj
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[isinstance](https://docs.python.org/3/library/functions.html#isinstance) "...is recommended for testing the type of an object..." – wwii Oct 16 '16 at 04:50
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Your "one-liner" is an example of when NOT to use list comprehensions. Do not mix imperative techniques (mutating a data structure: i.e. `list.exend`) with functional constructs, i.e. list comprehensions. Also, it is generally considered unpythonic to use multiple statements per line, seperated by a semicolon, like that. Readability counts. – juanpa.arrivillaga Oct 16 '16 at 07:34