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  Improving the performance of AWS Glue jobs involves several strategies that target different aspects of the ETL (Extract, Transform, Load) process. Here are some key practices. 1. Optimize Job Scripts Partitioning : Ensure your data is properly partitioned. Partitioning divides your data into manageable chunks, allowing parallel processing and reducing the amount of data scanned. Filtering : Apply pushdown predicates to filter data early in the ETL process, reducing the amount of data processed downstream. Compression : Use compressed file formats (e.g., Parquet, ORC) for your data sources and sinks. These formats not only reduce storage costs but also improve I/O performance. Optimize Transformations : Minimize the number of transformations and actions in your script. Combine transformations where possible and use DataFrame APIs which are optimized for performance. 2. Use Appropriate Data Formats Parquet and ORC : These columnar formats are efficient for storage and querying, signif

10 Must Read Python Interview Questions

10  Must Read Python Interview Questions

Here are ten python interview questions useful for your project use and other interviews.


Python Interview questions 


Python is a powerful scripting language. And you can use it in the web development, and science applications. Below, you will find interview questions on core python and web-framework as well.


1. What is PEP8?


PEP8 is a set of rules to format Python code for better readability. Further, you can read the user guide on PEP8.


2. What is memory management, and explain in detail?


Python manages memory automatically - cleaning, allocating, and managing; the detailed mechanism is as follows:


In the interview, you need to tell as below:

  • Python manages private heap space and is accessible to the only interpreter.
  • In heap space, Python stores objects and data structures.
  • The memory allocation is the responsibility of the memory manager
  • Python heap divides into pools (1 heap=64 pool), and the Pool divides into blocks (256 KB).
  • Python has an inbuilt garbage collector, which recycles the unused memory and frees the memory.

3. What are the different data types?

  • int
  • string
  • list
  • tuple
  • dictionary
  • Boolean

Check here more on data types.



4. What is Python Copy an object?


The '=' operator and COPY module you can use to copy objects. Here are the examples.



5. What are the various types of inheritances?


There are different types of inheritances:

  • Single inheritance
  • Multiple-inheritance
  • Multi-level inheritance
  • Hierarchical inheritance
  • Hybrid inheritance

Here is the example for each inheritance.



6. What are the differences between List and Tuple?


The list is mutable. But, tuple is immutable. Check out more differences between these two.



7. What is List Comprehension?


It is a concise way of creating a list and is popularly called List Comprehension.


Example:


a=[n*2 for n in range(10)]
print(a)
myList = [ num**2 for num in range(1,10) if num %2==0]
print(myList)


Python List comprehension examples.



8. What is dictionary comprehension?


The method of transforming one Dictionary into another Dictionary is called dictionary comprehension. Here are more examples of Dictionary comprehension.



9. What is slicing?


You can slice an object using the slice() method, which allows three parameters - start, length, and separator you can give.


Here is the best example for the slice method.



10. What is a negative index?


Internally python assigns to '-1' for the last occurrence of a string. Python assigns a negative index (-1, -2, and so on) in reverse order.  Here is the best example for a negative index.



References

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