How to convert a for loop to a list comprehension in python

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I have a nested for loop and I'd like to convert it to a list comprehension in python. How can I do that

all_combinations = []
for i in range(0,size):
    for j in range(i,size):
        if i!=j:
all_combinations = [(i,j)  for i in range(size) for j in range(i,size) if i!=j]

Python List Comprehensions: Explained Visually, From loops to comprehensions. Every list comprehension can be rewritten as a for loop but not every for loop can be rewritten as a list  I am trying to convert this loop with a nested if statement into list comprehension in python. I think I am having trouble seeing the pattern in list comprehensions. For context, the below loop scans through an array called ibi_a, and increases rowCount if each index it scans holds a value less than the variable antStart.

[PDF] From loop to comprehension in Python, From loop to comprehension in Python. Philip Klein. Basics. Let's say There is an even easier way to get this list: convert the range to a list: >>> list(range(10)). Python is famous for allowing you to write code that’s elegant, easy to write, and almost as easy to read as plain English. One of the language’s most distinctive features is the list comprehension, which you can use to create powerful functionality within a single line of code.

List comprehension:

all_combinations = [ (i,j) for i in range(0,size) for j in range(i,size) if i!=j ]

Python List Comprehension (With Examples), Learn how to effectively use list comprehension in Python to create lists, it's time to convert the following for loop to a list comprehension with  Here’s a list comprehension that does the same thing: flattened = [n for row in matrix for n in row] Nested loops in list comprehensions do not read like English prose. Note: My brain wants to write this list comprehension as: flattened = [n for n in row for row in matrix] But that’s not right! I’ve mistakenly flipped the for loops here

Why not just

all_combinations = [(i,j)  for i in range(size) for j in range(i+1,size) ]

Don't need an if test because this will never include (i,i)

(Tutorial) Python List Comprehension, Nested List Comprehensions are nothing but a list comprehension within another list comprehension which is quite similar to nested for loops. Let's take a look  List comprehensions provide a concise way to create lists. It consists of brackets containing an expression followed by a for clause, then zero or more for or if clauses. The expressions can be anything, meaning you can put in all kinds of objects in lists. The result will be a new list resulting from evaluating […]

Nested List Comprehensions in Python, Rewrite loops and map() calls as a list comprehension in Python; Choose You can easily convert this map object into a list using list() . Try writing the nested loop rst, then moving the inner loop into a procedure. Then you can separately (a) rewrite the procedure as a comprehension and (b) rewrite the outer loop as a comprehension. To review, there are two ways we might use a nested loop to construct a list.

When to Use a List Comprehension in Python – Real Python, List comprehensions consist of expression, followed by the loop syntax a traditional loop and then converting it to use a list comprehension. List is equivalent to arrays in other languages, with the extra benefit of being dynamic in size. In Python, list is a type of container in Data Structures, which is used to store multiple data at the same time. Unlike Sets, the list in Python are ordered and have a definite count. There are multiple ways to iterate over a list in Python.

Python List Comprehensions At a Glance - DEV, List comprehensions can be rewritten as for loops, though not every for loop is able to be rewritten as a list comprehension. Using our list  List Comprehensions are one of the most amazing features of Python. It is a smart and concise way of creating lists by iterating over an iterable object. Nested List Comprehensions are nothing but a list comprehension within another list comprehension which is quite similar to nested for loops.

  • yes, itertools is the way. I just post as list comprehension because the question: "I'd like to convert it to a list comprehension in python"
  • @daniherrera Fair enough, but I felt obligated to at least show the OP a better way to achieve what they are trying to do. This is essentially an XY problem
  • I agree with this approach.
  • I miss: why is not better: only is better if you are making combinations, if your post is a mcve abstraction of a complex problem where combinations don't solve your requirements you need to learn list comprehension ;)
  • It has sense, I posted direct translation because I thought this was a mcve of a real complex problem.

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