Python Data Science Jobs & Interviews
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Your go-to hub for Python and Data Science—featuring questions, answers, quizzes, and interview tips to sharpen your skills and boost your career in the data-driven world.

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What does [ ::-1 ] do?

❗️ Answer: [::-1] is used to reverse the order of an array or sequence.

🔍 For example:
import array as arr
My_Array=arr.array('i',[1,2,3,4,5])
My_Array[::-1]


Output: array('i', [5, 4, 3, 2, 1])

🌟 [::-1] reprints a reverse copy of an ordered data structure such as an array or list. The original array or list remains unchanged.
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🖥 25 Python Interview Questions and Answers for Middle

⚡️ Read the article

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What will this code output and why?

❗️ Answer: 6. Explanation:

1. In the outer_func function, x is created with the value 2.

2. Next, the inner_func function is declared, it does not remember the value of x or y immediately, but will receive it only when it is used.

3. x becomes equal to x + 2, i.e. 4, y is declared with the value 2

4. the return block (x(4) + y(2) = 6) is executed.

5. Despite declaring the value y = 3, the inner_func function will be called only after returning the value y = 2. Therefore, the output will be 6.


https://t.iss.one/DataScienceQ
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What will this code output?
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👩‍💻 What will this code output?

❗️ Answer: C (Error) This happens because the + operator does not work for set addition.

https://t.iss.one/DataScienceQ
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