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python list comprehension double for

[x for y in collection for x in y] # [A for B in C for D in E]
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python list comprehension double for

>>> l = [(x,y) for x in range(0,3) for y in range(5, 8)]
>>> l
[(0, 5), (0, 6), (0, 7), (1, 5), (1, 6), (1, 7), (2, 5), (2, 6), (2, 7)]

# they can also be "chained"
>>> l = [(x,y) for x in range(0,4) for y in range(0, x)]
>>> l
[(1, 0), (2, 0), (2, 1), (3, 0), (3, 1), (3, 2)]
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double for loop in list comprehension

# List Comprehension 
[word for sentence in text for word in sentence]
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