[Python] 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?

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