In Python, a list comprehension is a concise and elegant way to create lists. It allows you to generate a new list by applying an expression to each item in an existing iterable (like a list or range), often in a single line of code, making it more readable and compact than a traditional
Both the loop and the basic list comprehension produce the exact same result: a list of the first 10 square numbers. However, the list comprehension is more efficient and easier to read once you are familiar with the syntax.
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By: @DataScienceQ🩵
for loop.# Traditional way using a for loop
squares_loop = []
for i in range(10):
squares_loop.append(i i)
print(f"Using a loop: {squares_loop}")
The Pythonic way using a list comprehension
squares_comp = [i i for i in range(10)]
print(f"Using comprehension: {squares_comp}")
You can also add conditions
even_squares = [i * i for i in range(10) if i % 2 == 0]
print(f"Even squares only: {even_squares}")
Both the loop and the basic list comprehension produce the exact same result: a list of the first 10 square numbers. However, the list comprehension is more efficient and easier to read once you are familiar with the syntax.
#Python #ListComprehension #PythonTips #CodeExamples #Programming #Pythonic #Developer #Code
By: @DataScienceQ
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The Walrus Operator
Introduced in Python 3.8, the "walrus operator"
It solves the common problem where you need to compute a value, check it, and then use it again.
---
#### The Old Way: Repetitive Code
Consider a loop that repeatedly prompts a user for input and stops when the user enters "quit".
Notice how
---
#### The Pythonic Way: Using the Walrus Operator
The walrus operator lets you capture the value and test it in a single, elegant line.
Here,
• Calls
• The entire expression evaluates to that same value, which is then compared to
This eliminates redundant code, making your logic cleaner and more direct.
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By: @DataScienceQ ✨
:= (Assignment Expressions)Introduced in Python 3.8, the "walrus operator"
:= allows you to assign a value to a variable as part of a larger expression. It's a powerful tool for writing more concise and readable code, especially in while loops and comprehensions.It solves the common problem where you need to compute a value, check it, and then use it again.
---
#### The Old Way: Repetitive Code
Consider a loop that repeatedly prompts a user for input and stops when the user enters "quit".
# We have to get the input once before the loop,
# and then again inside the loop.
command = input("Enter command: ")
while command != "quit":
print(f"Executing: {command}")
command = input("Enter command: ")
print("Exiting program.")
Notice how
input("Enter command: ") is written twice.---
#### The Pythonic Way: Using the Walrus Operator
:=The walrus operator lets you capture the value and test it in a single, elegant line.
while (command := input("Enter command: ")) != "quit":
print(f"Executing: {command}")
print("Exiting program.")Here,
(command := input(...)) does two things:• Calls
input() and assigns its value to the command variable.• The entire expression evaluates to that same value, which is then compared to
"quit".This eliminates redundant code, making your logic cleaner and more direct.
#Python #PythonTips #PythonTricks #WalrusOperator #Python3 #CleanCode #Programming #Developer #CodingTips
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By: @DataScienceQ ✨
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