List comprehension on a nested list?
I have this nested list:
l = [['40', '20', '10', '30'], ['20', '20', '20', '20', '20', '30', '20'], ['30', '20', '30', '50', '10', '30', '20', '20', '20'], ['100', '100'], ['100', '100', '100', '100', '100'], ['100', '100', '100', '100']]
Now, what I want to do is convert each element in a list to float. My solution is this:
newList =  for x in l: for y in x: newList.append(float(y))
But can this be done using nested list comprehension, right?
what I've done is:
[float(y) for y in x for x in l]
But then the result is bunch of 100's with the sum of 2400.
any solution, an explanation would be much appreciated. Thanks!
Here is how you would do this with a nested list comprehension:
[[float(y) for y in x] for x in l]
This would give you a list of lists, similar to what you started with except with floats instead of strings. If you want one flat list then you would use
[float(y) for x in l for y in x].
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