Python | Nested List Comprehension
List Comprehension is a beautiful feature of Python. But most of the Python beginners (like me) get confused when it comes to nested list comprehension. So I thought to write few lines of Python code that might help you to understand it better.
Can you figure out the output of the following statement?
Here is the output:
If you could figure it out correctly, you don't need to read the rest of the post.
Now, look at the following code
This is actually same as
Now think about it, experiment with your own ideas and things will be clear. :)
Can you figure out the output of the following statement?
[(x, y) for x in range(1, 5) for y in range(0, x)]
Here is the output:
[(1, 0), (2, 0), (2, 1), (3, 0), (3, 1), (3, 2), (4, 0), (4, 1), (4, 2), (4, 3)]
If you could figure it out correctly, you don't need to read the rest of the post.
Now, look at the following code
>>> for x in range(1, 5):
... for y in range(0, x):
... print x, y
...
1 0
2 0
2 1
3 0
3 1
3 2
4 0
4 1
4 2
4 3
>>>
This is actually same as
[(x, y) for x in range(1, 5) for y in range(0, x)]
Now think about it, experiment with your own ideas and things will be clear. :)
Comments