>>> numbers = []
>>> with open('filename.txt', 'r') as f:
...     for line in f:
...         current = []
...         for num in line.split():
...             current.append(float(num))
...         numbers.append(current)
...         
>>> numbers
[[1.0, 2.0, 3.6, 7.9, 90.0], [1.0, 2.0, 3.6, 7.8, 90.0], [1.0, 2.0, 3.6, 7.7, 90.0]]

s=[map(float, i.split()) for i in open('uu.txt','r').readlines()]

>>> with open('file.txt', encoding='utf-8') as fin:
...   matr = [list(map(float, line.split())) for line in fin]
... 
>>> matr
[[1.0, 2.3, 4.0], [5.8, 0.0, 6.0], [4.0, 6.0, 7.8]]
>>>