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What is the operator.length_hint() method in Python?

abhilash

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.

What is the operator module?

The operator module is a built-in module in Python. The module provides functions equivalent to the intrinsic operators of Python. For instance, we can use the operator.mul() method for multiplication instead of using the multiplication (*) operator.

The module’s functions come in handy when callable methods are given as arguments to another Python object.

The length_hint() method

The length_hint() method returns an estimate of the number of elements in the given object. The return value of the method will be exact if the given object supports the len() method. Otherwise, the method may overestimate or underestimate the number of elements in the object.

Example

import operator
obj = [1, 2, 3]
print("operator.length_hint(%s) = %s" % (obj, operator.length_hint(obj)))
obj = "hello educative"
print("operator.length_hint(%s) = %s" % (obj, operator.length_hint(obj)))
obj = 13
print("operator.length_hint(%s) = %s" % (obj, operator.length_hint(obj)))

Explanation

  • Line 1: We import the operator module.
  • Line 5: We invoke the operator.length_hint() method on a list and print the result.
  • Line 9: We invoke the operator.length_hint() method on a string and print the result.
  • Line 13: We invoke the operator.length_hint() method on an integer and print the result.

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python
communitycreator

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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