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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

How to Write Lambda Function Quickly in Python: 5 Examples

Here are the top python lambda function examples for your project and interviews. "Python's lambda functions are a powerful way to create small, anonymous functions on the fly. In this post, we'll explore some examples of how to use lambda functions in Python.


5 Best Python Lambda Function Examples


Lambda in python


#1 Sorting a List of Tuples by the Second Element

This lambda function sorts a list of tuples based on the second element of each tuple.


python code

my_list = [(1, 2), (4, 1), (9, 10), (13, 6), (5, 7)]

sorted_list = sorted(my_list, key=lambda x: x[1])

print(sorted_list)


Output:


[(4, 1), (1, 2), (13, 6), (5, 7), (9, 10)]

** Process exited - Return Code: 0 **

Press Enter to exit terminal


#2 Finding the Maximum Value in a List of Dictionaries

This lambda function finds the maximum value in a list of dictionaries based on a specific key.


python code

my_list = [{'name': 'Alice', 'age': 25}, {'name': 'Bob', 'age': 30}, {'name': 'Charlie', 'age': 20}]

max_age = max(my_list, key=lambda x: x['age'])

print(max_age)


Output:

{'name': 'Bob', 'age': 30}


** Process exited - Return Code: 0 **

Press Enter to exit terminal


#3 Multiplying Two Lists Element-Wise

This lambda function multiplies two lists element-wise and returns the result as a new list.


python code

list1 = [1, 2, 3, 4]

list2 = [5, 6, 7, 8]

result = list(map(lambda x, y: x * y, list1, list2))

print(result)

Output:


[5, 12, 21, 32]

** Process exited - Return Code: 0 **

Press Enter to exit terminal


#4 Filtering a List of Integers

This lambda function filters a list of integers and returns only the even numbers.


python code

my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

even_numbers = list(filter(lambda x: x % 2 == 0, my_list))

print(even_numbers)

Output:


[2, 4, 6, 8, 10]

** Process exited - Return Code: 0 **

Press Enter to exit terminal


#5 Creating a Function That Returns a Function

This lambda function creates a function that returns another function that adds a constant value to its input.


python code

def add_constant(const):

    return lambda x: x + const


add5 = add_constant(5)

add10 = add_constant(10)


print(add5(3))

print(add10(3))


Output:

8

13


** Process exited - Return Code: 0 **

Press Enter to exit terminal


In the above example, add_constant is a function that returns a lambda function that adds the constant value to its input. add5 and add10 are two different functions that add 5 and 10 to their input, respectively.

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