Latest Questions 84 total
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61What is Pandas and how is it used in data science?
Pandas is a Python library for data manipulation and analysis. It provides two main data structures:
**Series** — 1D labelled array
**Dat...
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62What is feature engineering in machine learning?
Feature engineering is the process of using domain knowledge to create, transform, or select input variables (features) that help ML models ...
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63What is the difference between mean, median, and mode?
**Mean** — sum divided by count. Sensitive to outliers.
**Median** — middle value when sorted. Robust to outliers.
**Mode** — most fre...
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64What is the data science lifecycle?
The data science lifecycle has 6 stages:
1. **Business Understanding** — define the problem
2. **Data Collection** — gather relevant da...
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65What is overfitting and how do you prevent it?
Overfitting occurs when a model learns the training data too well (including noise), so it performs poorly on new data.
**Signs:** High tra...
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66How does a transformer model work?
A Transformer uses **self-attention** to process all tokens in a sequence simultaneously (unlike RNNs which process sequentially).
Key comp...
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67What is the difference between supervised and unsupervised learning?
**Supervised learning** — model learns from labelled data (input → output pairs)
- Examples: Linear regression, Random Forest, SVM
- Use...
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68What is LangChain and why is it used?
LangChain is a framework for building applications with Large Language Models (LLMs).
It provides:
- **Chains** — link multiple LLM calls...
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69What is the difference between == and is in Python?
**==** checks value equality — are the values the same?
**is** checks identity — are they the exact same object in memory?
```python
a ...
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70Explain list comprehension in Python with examples
List comprehension is a concise way to create lists.
```python
# Traditional way
squares = []
for x in range(10):
squares.append(x**2)
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71What is a Python decorator and how do you use it?
A decorator is a function that wraps another function to extend its behaviour without modifying it.
```python
def my_decorator(func):
d...
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72How does Python handle memory management?
Python uses automatic memory management through a private heap and a garbage collector.
1. **Reference counting** — every object tracks h...
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73What is the difference between a list and a tuple in Python?
Python is one of the most commonly asked Python basics interview questions.
A **list** is mutable (you can change its elements), while a **...
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74What is Vibe Coding, and how is it different from traditional software development?
I'm hearing the term "Vibe Coding" more frequently in AI and developer communities. It seems to involve building applications by describing ...
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75How can I improve my self-confidence?
Confidence plays a major role in personal and professional growth. What practical steps, habits, or experiences have helped you become more ...
