Top "List-comprehension" questions

A syntactic construct which provides a concise way to create lists in a style similar to the mathematical set-builder notation.

list comprehension replace for loop in 2D matrix

I try to use list comprehension to replace the for loop. original file is 2 3 4 5 6 3 1 2 2 4 5 5 1 2 2 2 2 4 for loop line_number = 0 for line …

python int output list-comprehension
Python-like list comprehension in Java

Since Java doesn't allow passing methods as parameters, what trick do you use to implement Python like list comprehension in …

java python parameters methods list-comprehension
python list comprehension double for

vec = [[1,2,3], [4,5,6], [7,8,9]] print [num for elem in vec for num in elem] <----- this >>> [1, 2, 3, 4, 5, 6, 7, 8, 9] This is tricking …

python list-comprehension
Python list comprehension to join list of lists

Given lists = [['hello'], ['world', 'foo', 'bar']] How do I transform that into a single list of strings? combinedLists = ['hello', 'world', …

python list-comprehension
Using break in a list comprehension

How can I break a list comprehension based on a condition, for instance when the number 412 is found? Code: numbers = [951, 402, 984, 651, 360, 69, 408, 319, 601, 485, 980, 507, 725, 547, 544, 615, 83, 165, 141, 501, 263, 617, 865, 575, 219, 390, 984, 592, 236, 105, 942, 941, 386, 462, 47, 418, 907, 344, 236, 375, 823, 566, 597, 978, 328, 615, 953, 345, 399, 162, 758, 219, 918, 237, 412, 566, 826, 248, 866, 950, 626, 949, 687, 217, 815, 67, 104, 58, 512, 24, 892, 894, 767, 553, 81, 379, 843, 831, 445, 742, 717, 958, 609, 842, 451, 688, 753, 854, 685, 93, 857, 440, 380, 126, 721, 328, 753, 470, 743, 527] …

python list-comprehension
Nested dictionary comprehension python

I'm having trouble understanding nested dictionary comprehensions in Python 3. The result I'm getting from the example below outputs the correct …

python syntax nested list-comprehension dictionary-comprehension
sum each value in a list of tuples

I have a list of tuples similar to this: l = [(1, 2), (3, 4), (5, 6), (7, 8), (9, 0)] I want to create a simple one-liner that will give …

python performance list python-2.7 list-comprehension
Line continuation for list comprehensions or generator expressions in python

How are you supposed to break up a very long list comprehension? [something_that_is_pretty_long for something_that_…

python coding-style list-comprehension pep8
What do backticks mean to the python interpreter: `num`

I'm playing around with list comprehensions and I came across this little snippet on another site: return ''.join([`num` …

python list-comprehension
List comprehension for running total

I want to get a running total from a list of numbers. For demo purposes, I start with a sequential …

python list-comprehension cumulative-sum