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How to Read a CSV File from Amazon S3 Using Python (With Headers and Rows Displayed)

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  Introduction If you’re working with cloud data, especially on AWS, chances are you’ll encounter data stored in CSV files inside an Amazon S3 bucket . Whether you're building a data pipeline or a quick analysis tool, reading data directly from S3 in Python is a fast, reliable, and scalable way to get started. In this blog post, we’ll walk through: Setting up access to S3 Reading a CSV file using Python and Boto3 Displaying headers and rows Tips to handle larger datasets Let’s jump in! What You’ll Need An AWS account An S3 bucket with a CSV file uploaded AWS credentials (access key and secret key) Python 3.x installed boto3 and pandas libraries installed (you can install them via pip) pip install boto3 pandas Step-by-Step: Read CSV from S3 Let’s say your S3 bucket is named my-data-bucket , and your CSV file is sample-data/employees.csv . ✅ Step 1: Import Required Libraries import boto3 import pandas as pd from io import StringIO boto3 is...

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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