Thursday, December 7, 2017

Integer Overflow in Python - Python for Technical InterviewsProgramming Interviews Series

How to handle large integers in Python?
Unlike other lower level programming languages. Python can dynamically resize arrays and integers to fit larger data. You are less likely going to run into integer overflow issues in Python. Also less likely going to have to worry about bit manipulation. What if this question comes up in an interview?

You can use float('inf') to represent positive infinity and - float('inf'), read it as negative infinity casted as a float, to represent really large negative number. Note you are casting the number as a float not as integer.

More familiar with the notion of MAXINT from JAVA? You can use an external module to cast integers. The module is called sys

import sys 
my_max_num = sys.maxint 
my_min_num = -sys.maxint

Here's a tip for beginners: why is this useful? Let's say you are asked to find a min in an array, which can contain both positive and negative numbers. You may want to initialize current_min as -sys.maxint

Why not just set it equal to negative one? Well the array can contain other negative numbers smaller than one so that wouldn't work.

Uniqtech Technical Interview with Python series is geared towards learn to code, learn programming beginners and bootcamp grads. subscribe to our newsletter
subject: technical interview with python

float('inf') will result in a floating point number. That's not always the desired result.  Turns out, we can also get a maxint estimate from the sys module.

>>> import sys
>>> sys.maxint

The above behavior is Python 2.x 
The difference between Python 2.x and Python 3 can be viewed here.

1 comment:

  1. I am glad that I saw this post. It is informative blog for us and we need this type of blog thanks for share this blog, Keep posting such instructional blogs and I am looking forward for your future posts.
    Python Projects for Students

    Data analytics is the study of dissecting crude data so as to make decisions about that data. Data analytics advances and procedures are generally utilized in business ventures to empower associations to settle on progressively Python Training in Chennai educated business choices. In the present worldwide commercial center, it isn't sufficient to assemble data and do the math; you should realize how to apply that data to genuine situations such that will affect conduct. In the program you will initially gain proficiency with the specialized skills, including R and Python dialects most usually utilized in data analytics programming and usage; Python Training in Chennai at that point center around the commonsense application, in view of genuine business issues in a scope of industry segments, for example, wellbeing, promoting and account.

    Project Center in Chennai


React UI, UI UX, Reactstrap React Bootstrap

React UI MATERIAL  Install yarn add @material-ui/icons Reactstrap FORMS. Controlled Forms. Uncontrolled Forms.  Columns, grid