Arie Bregman

Linux And Stuff

Tag: Python (page 1 of 2)

Python: check if two strings are permutations of each other

Another question I cover in a presentation I’m preparing for “Open University meets Open Source” meetups.

What is a Permutation?

Permutation is the action of rearranging objects, characters or symbols into different, unique sequences.

Each sequence is called ‘permutation’.

It’s common to see people mix permutation with combination, but those are two different things. Remember, combination doesn’t care about the order, while permutation does.

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Python: check if one string is a rotation of another string

Another question I cover in a presentation I’m preparing for “Open University meets Open Source” meetups.

The question

You have two strings, str1 and str2 and you need to return True if the first string is a rotation of the second string. Otherwise, return False.

Examples

“hello”,    “llohe” -> True. If we’ll rotate the second string twice, you’ll get ‘hello’.

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Python: Working with RPMs

In this post I’ll cover:

  • Using the dnf module for querying for RPMs
  • Exctract RPM details with re module
  • Comparing RPM versions

The complete code is included at the end.

Query for RPMs

In this part I’ll show you how to use the DNF module in order to search for RPMs and extract information on them such as arch, version and name.

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Python: Objects comparison

One of the most common questions I get asked by python beginners, is “how do you compare between objects of a class?”

To answer this question, let’s have a look on the following class:

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Python: How to use signal handlers

What is a signal?

Software interrupts sent to the program to notify on significant event or request the program  to run special sequence .

For example, the following command uses SIGHUP signal to request the program to reload it’s configuration

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