["python","list","nested","list-comprehension"]
How can I use list comprehensions to process 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']] I want to convert each element in l to float. I have this code: newList = [] for x in l: for y in x: newList.append(float(y)) How can I solve the problem with a nested list comprehension instead? See also: How can I get a flat result from a list comprehension instead of a nested list?
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] Note the loop order - for x in l comes first in this one.