Senior Python Engineer Interview Questions 2026

Furthermore, it continuously updates its automation libraries to align with the latest browser versions and features, ensuring that any compatibility issues are swiftly addressed. This mode runs in the background, which can lead to faster execution and is ideal for continuous integration pipelines and automated testing scenarios where visual feedback is less critical. By actively checking for these common errors and utilizing robust troubleshooting techniques, you can enhance your Playwright automation experience. When using Playwright, users may encounter a variety of common errors that can disrupt automation workflows. Additionally, Playwright offers options to customize the waiting behavior, like setting a timeout or waiting for elements to be visible, hidden, or attached to the DOM. This method is particularly useful for ensuring that your script does not fail due to elements not being ready for interaction.

• Understanding asynchronous programming in Python aids in handling large datasets efficiently.
• Lists are mutable, allowing changes to their contents, while tuples are immutable and cannot be altered once defined.
• A filter buried in Python logic or applied after a UDF reads the whole table.
• In this article, we have seen commonly asked interview questions for a python developer.

Remember, the best way to prove your expertise is by writing clean, deterministic code and demonstrating a strong grasp of debugging strategies. They want SDETs who understand browser contexts, can design scalable fixtures, mitigate flaky tests in CI/CD, and leverage the new Model Context Protocol (MCP) to integrate AI into their workflows. In 2026, interviewers aren’t just looking for candidates who can write a `page.click()` command.
Study common data structures such as lists, dictionaries, and sets, and practice implementing algorithms such as sorting and searching. There is a great need for proficient Python developers across various industries, including technology, finance, healthcare, and government, so there are numerous job openings and competitive pay rates for qualified candidates. The interview runs in a browser-based IDE — no installation required. Senior interviews increasingly include questions about evaluating AI-generated code, debugging production systems, and defending past architectural decisions. They’re tested internally before being used in real interviews, and they’re mapped to specific role levels so a fresher doesn’t get a senior-level system design prompt. Scenario-based questions, system design tradeoffs, and conceptual CS questions.

They are particularly useful when several operations may fail independently, such as in concurrent or asynchronous programs. Exception Groups are a feature introduced in Python 3.11 that allow multiple exceptions to be grouped together and handled in a structured way. It is commonly used to display timestamps, log events, or retrieve the current system date and time. Python interpreter handles memory allocation and deallocation and an inbuilt garbage collector reclaims memory occupied by objects that are no longer in use. A decorator is essentially a function that takes another function as an argument and returns a new function with enhanced functionality. The derived class inherits all the features of the base case.
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