Python: Extract non_zero block from a given integers of list

Last update on April 22 2025 12:54:51 (UTC/GMT +8 hours)

44. Extract Non-zero Block

Write a Python program to extract a non-zero block from a given integer list.

Sample Solution:

Python Code:

import itertools as it
def test(lst):
    result = [ list(x[1]) for x in it.groupby(lst, lambda x: x == 0) if not x[0] ]
    return result
nums = [3,4,6,2,0,0,0,0,0,0,6,7,6,9,10,0,0,0,0,0,7,4,4,0,0,0,0,0,0,5,3,2,9,7,1]
print("\nOriginal list:")
print(nums)
print("\nExtract non_zero block from a given integers of list:")
print(test(nums))

Sample Output:

Original list:
[3, 4, 6, 2, 0, 0, 0, 0, 0, 0, 6, 7, 6, 9, 10, 0, 0, 0, 0, 0, 7, 4, 4, 0, 0, 0, 0, 0, 0, 5, 3, 2, 9, 7, 1]

Extract non_zero block from a given integers of list:
[[3, 4, 6, 2], [6, 7, 6, 9, 10], [7, 4, 4], [5, 3, 2, 9, 7, 1]]

For more Practice: Solve these Related Problems:

• Write a Python program to extract the first contiguous block of non-zero numbers from a given list using itertools.takewhile.
• Write a Python program to create an iterator that skips over zeros and then groups non-zero elements into a block using itertools.groupby.
• Write a Python program to split a list into blocks separated by zeros and then select the longest non-zero block.
• Write a Python program to use itertools.dropwhile to ignore leading zeros and then collect the next sequence of non-zero numbers into a list.

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Python Code Editor:

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