How to get a list of indices of non zero elements in a list in python?

How to get a list of indices of non zero elements in a list in python?

You can get a list of indices of non-zero elements in a list in Python using list comprehension or a loop. Here's how you can do it:

Using List Comprehension:

my_list = [0, 1, 0, 2, 0, 3, 4] non_zero_indices = [index for index, value in enumerate(my_list) if value != 0] print(non_zero_indices)

Using a Loop:

my_list = [0, 1, 0, 2, 0, 3, 4] non_zero_indices = [] for index, value in enumerate(my_list): if value != 0: non_zero_indices.append(index) print(non_zero_indices)

Both of these methods will give you a list of indices where the elements in my_list are non-zero. In this example, non_zero_indices will be [1, 3, 5, 6], which are the positions of non-zero elements in the list.

Examples

  1. "Python find indices of non-zero elements in list"

    • Description: Users often search for ways to identify the positions or indices of non-zero elements within a Python list efficiently.
    • Code:
      def non_zero_indices(input_list): return [index for index, value in enumerate(input_list) if value != 0] # Usage example my_list = [0, 1, 0, 3, 4, 0, 5] result = non_zero_indices(my_list) print(result)

  2. "Python list nonzero element positions"

    • Description: This query targets finding the positions of non-zero elements in a Python list, a common operation in data manipulation tasks.
    • Code:
      def nonzero_positions(input_list): return [index for index, value in enumerate(input_list) if value != 0] # Usage example my_list = [0, 1, 0, 3, 4, 0, 5] result = nonzero_positions(my_list) print(result)

  3. "Python get indices of non-zero elements in array"

    • Description: Users might search for methods to obtain the indices of non-zero elements within a Python array for various computational tasks.
    • Code:
      import numpy as np def non_zero_indices_array(input_array): return np.nonzero(input_array)[0] # Usage example my_array = np.array([0, 1, 0, 3, 4, 0, 5]) result = non_zero_indices_array(my_array) print(result)

  4. "Python find positions of nonzero elements in list"

    • Description: This query mirrors the intent of the first query, targeting users looking for methods to locate non-zero elements within a Python list.
    • Code:
      def nonzero_positions_list(input_list): return [index for index, value in enumerate(input_list) if value != 0] # Usage example my_list = [0, 1, 0, 3, 4, 0, 5] result = nonzero_positions_list(my_list) print(result)

  5. "Python list indices of non-zero elements"

    • Description: Users may search using this query to find concise ways to obtain the indices of non-zero elements within Python lists for their programming needs.
    • Code:
      def non_zero_indices_list(input_list): return [index for index, value in enumerate(input_list) if value != 0] # Usage example my_list = [0, 1, 0, 3, 4, 0, 5] result = non_zero_indices_list(my_list) print(result)

  6. "Python nonzero element indices list"

    • Description: Some users might phrase their query in terms of wanting a list of indices for non-zero elements within a Python list, prompting similar solutions.
    • Code:
      def nonzero_indices(input_list): return [index for index, value in enumerate(input_list) if value != 0] # Usage example my_list = [0, 1, 0, 3, 4, 0, 5] result = nonzero_indices(my_list) print(result)

  7. "Python get indices of nonzero elements list"

    • Description: Users might search for this query to express their intent clearly: finding the positions of nonzero elements within a list using Python.
    • Code:
      def nonzero_indices(input_list): return [index for index, value in enumerate(input_list) if value != 0] # Usage example my_list = [0, 1, 0, 3, 4, 0, 5] result = nonzero_indices(my_list) print(result)

  8. "Python nonzero element indexes list"

    • Description: This query is another variant used by users aiming to retrieve the indexes of non-zero elements in a Python list.
    • Code:
      def nonzero_indices(input_list): return [index for index, value in enumerate(input_list) if value != 0] # Usage example my_list = [0, 1, 0, 3, 4, 0, 5] result = nonzero_indices(my_list) print(result)

  9. "Python list indices of nonzero values"

    • Description: Users may search for this query to specifically target the indices of non-zero values within a Python list, especially in mathematical or scientific contexts.
    • Code:
      def nonzero_indices(input_list): return [index for index, value in enumerate(input_list) if value != 0] # Usage example my_list = [0, 1, 0, 3, 4, 0, 5] result = nonzero_indices(my_list) print(result)

  10. "Python find indexes of non-zero elements list"

    • Description: Users might frame their query using this phrasing to seek solutions for locating the positions of non-zero elements within Python lists.
    • Code:
      def nonzero_indices(input_list): return [index for index, value in enumerate(input_list) if value != 0] # Usage example my_list = [0, 1, 0, 3, 4, 0, 5] result = nonzero_indices(my_list) print(result)

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