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Top 40 NumPy Interview Questions
Entry Junior Mid Senior Expert
NumPy Theoretical Questions
Q1:
Why to use NumPy?
Entry
Q2:
Explain what is ndarray in NumPy
Junior
Q3:
Compute the min/max for each row for a NumPy 2D array
min/max for each row for a NumPy 2D array Junior
Q4:
How would you convert a Pandas DataFrame into a NumPy array?
Junior
Q5:
What is the difference between ndarray and array in NumPy?
ndarray and array in NumPy? Junior
Mid Q7:
Explain what is Vectorization in NumPy
Mid Q8:
What does einsum do in NumPy?
einsum do in NumPy? Mid Q9:
What is the difference between Vectorisation vs Broadcasting in NumPy?
Mid Mid Q11:
What are the advantages of NumPy over regular Python lists?
Mid Q12:
What are the differences between np.mean() vs np.average() in Python NumPy?
np.mean() vs np.average() in Python NumPy? Mid Q13:
What is the most efficient way to map a function over a NumPy array?
Mid Q14:
What are the differences between NumPy arrays and matrices?
Mid Q15:
What is the difference between flatten and ravel functions in NumPy?
flatten and ravel functions in NumPy? Mid Mid Q17:
What is the difference between contiguous and non-contiguous arrays?
Senior Q18:
What is the difference between the following assignment methods?
Senior Q19:
What are Strides in NumPy? How does it work?
Senior Q20:
What's the difference between a View and a Shallow Copy of a NumPy array?
Senior Q21:
How to normalize an array in NumPy to a Unit Vector?
Senior Q22:
What are some main reason why NumPy is so fast?
Senior Q23:
What is Fortran contiguous arrays?
Expert NumPy Practical Challenges
Q1:
How to access the i-th column of a NumPy multidimensional array?
i-th column of a NumPy multidimensional array?
Junior Junior Q3:
Calculate the Euclidean Distance between two points
Junior Q4:
Convert array of indices to One-Hot encoded NumPy array
Mid Q5:
How to convert an array of arrays into a flat 1D array?
Mid Q6:
How to find all the local maxima (or peaks) in a 1D array?
Mid Q7:
What's the easiest way to implement a moving average with NumPy?
Mid Q8:
Extract all numbers between a given range from a NumPy array
Mid Q9:
How to convert a numeric array to a categorical (text) array?
Mid Q10:
Transpose matrix using einsum similar to np.transpose(arr)
einsum similar to np.transpose(arr) Mid Q11:
What is the difference between test[:,0] vs test[:,[0]]? When would you use one?
test[:,0] vs test[:,[0]]? When would you use one? Mid Q12:
How would you reverse a NumPy array?
Mid Q13:
How would you get indices of N-max values in a NumPy array?
Mid Q14:
Write the einsum equivalent of inner, outer, sum, and multiplication functions
einsum equivalent of inner, outer, sum, and multiplication functions Senior Q15:
Consider an array Z = [1,2,3,4,5,6,7,8,9,10,11,12,13,14], how to generate an array R = [[1,2,3,4], [2,3,4,5], [3,4,5,6], ..., [11,12,13,14]]?
Z = [1,2,3,4,5,6,7,8,9,10,11,12,13,14], how to generate an array R = [[1,2,3,4], [2,3,4,5], [3,4,5,6], ..., [11,12,13,14]]? Senior Q16:
Consider a one-dimensional array Z, build a two-dimensional array whose first row is (Z[0],Z[1],Z[2]) and each subsequent row is shifted by 1 (last row should be (Z[-3],Z[-2],Z[-1]))
(Z[0],Z[1],Z[2]) and each subsequent row is shifted by 1 (last row should be (Z[-3],Z[-2],Z[-1])) Senior Q17:
Sum over last two axis at once
Senior 
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