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What is the numpy.all() in Python?

Onyejiaku Theophilus Chidalu

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

Overview

The all() function in Python is simply used to check if all the elements of an array along a given axis evaluate to True.

Syntax

numpy.all(a, axis=None, out=None, keepdims=<no value>, *, where=<no value>)

Required parameter value

The all() function takes a mandatory function a which represents the input array or objects that can be converted to an array.

Optional parameter value

The all() function takes the following optional parameter values:

  • axis: The represents the axis or axes along which a logical AND reduction is perfromed. The default value is (axis = None) and when negative, it counts from the last to the first axis.
  • out: This represents an alternate output array in which to place to the result. It must have the same shape as the expected output array.
  • keepdims: If this is set to True, axes which are reduced are left in the result as dimensions with size one.
  • where: This represents elements to include in checking for all True values.

Return value

The all() function returns a boolean value or array.

Code Example

import numpy as np
# creating an array
myarray = np.arange(6) + 1
# calling the numpy.all() function
newarray = np.all(myarray)
# printing the array
print(newarray)
Implementing the numpy.all() function

Code Explanation

  • Line 1: We import the numpy module.
  • Line 4: We create an array variable myarray.
  • Line 7: We implement the all() function on the array myarray. The result is assigned to a new variable, newarray.
  • Line 10: We print the variable newarray.

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Onyejiaku Theophilus Chidalu

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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