Completed Full Stack Python Course? Know What to Prepare for the Interview
Focus on Core Python Concepts
1. Tell something about a list and a tuple in Python.
Tuples are immutable and typically faster than lists, which can be modified after creation.
2. What are lambda functions, and their use?
Lambda functions are anonymous, one-liner functions defined using the lambda keyword, often used for quick, throwaway operations.
3. How is Python's 'is' operator different from '=='?
it checks if two objects share the same memory location, whereas == checks if their values are equal.
4. What are Python decorators, and how are they used?
Decorators are functions that modify the behavior of other functions or methods, defined using the @decorator syntax.
5. How does Python manage memory?
Python uses automatic garbage collection and reference counting to manage memory efficiently.
Object-Oriented Programming (OOP)
1. Do you know the objective of the init method in Python?
It is used to initialize an object’s attributes when creating an instance of a class.
2. Tell me the major difference between method overloading and overriding ?
Overriding allows a subclass to redefine a parent class method, while Python does not support true method overloading.
3. What is multiple inheritance, and how does Python handle conflicts?
Multiple inheritance allows a class to inherit from multiple parent classes, and Python resolves conflicts using the Method Resolution Order (MRO).
Data Structures and Algorithms
1. How can you implement a stack or queue in Python?
a. Stack: Use list.append() to push and list.pop() to remove.
b. Queue: Use collections. deque for efficient operations.
2. How would you write a Python function for binary search?
python
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def binary_search(arr, target):
left, right = 0, len(arr) - 1
while left <= right:
mid = (left + right) // 2
if arr[mid] == target:
return mid
elif arr[mid] < target:
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left = mid + 1
else:
right = mid - 1
return -1
3. What are the time complexities for dictionary operations in Python?
Average case: O (1) for lookups and insertions.
Worst case: O(n) due to hash collisions.
Libraries and Frameworks
1. How do you handle missing data in Pandas?
Use fillna() to replace missing values and dropna() to remove rows or columns with missing values.
2. Write a Python snippet to plot a simple line graph using Matplotlib.
python
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import matplotlib.pyplot as plt
plt.plot([1, 2, 3], [4, 5, 6])
plt.show()
3. What are Flask app routes, and how are they defined?
App routes in Flask are URL patterns defined using the @app.route('/path') decorator to associate a URL with a view function.
Problem-Solving and Debugging
Write a Python function to find two numbers in an array that sum to a target value.
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def two_sum(nums, target):
seen = {}
for i, num in enumerate(nums):
if target - num in seen:
return [seen[target - num], i]
seen[num] = i
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