Manage empty list/invalid input when finding max/min value of list (Python)
By : ewm
Date : March 29 2020, 07:55 AM

How to create a subset list based upon another list values with Python
By : Pradeep Dalvi
Date : March 29 2020, 07:55 AM
With these it helps I have three identical length lists for scatter plotting: x (float), y (float) and c (integer for colour), and would like to split up the x and y lists into subsets filtered by the colour value so that I can use a legend the delineate them in a plot , I hope this helps: code :
x = [1, 2, 3, 4, 5]
y = [5, 3, 1, 3, 2]
c = [1, 3, 2, 3, 1]
c_list = list(set(c))
xset = []
yset = []
for j in c_list:
xset.append([x[i] for i, v in enumerate(c) if v == j])
yset.append([y[i] for i, v in enumerate(c) if v == j])
print(xset)
print(yset)

Subset of python list based on groups of elements of same list, pythonically
By : user3225237
Date : March 29 2020, 07:55 AM
may help you . I have a flat list of numbers that are logically in groups of 3, where each triple is (number, __ignored, flag[0 or 1]), eg: , I think the most direct way would be a simple list comprehension: code :
>>> [L[i]*L[i+2] for i in range(0, len(L), 3)]
[7, 0, 0, 6, 0, 2]
>>> import numpy as np
>>> a = np.array(L).reshape(1, 3).T
>>> a
array([[ 7, 8, 2, 6, 7, 2],
[56, 0, 0, 1, 2, 99],
[ 1, 0, 0, 1, 0, 1]])
>>> a[0]*a[2]
array([7, 0, 0, 6, 0, 2])

How to get a subset of a list based on conditions using python lambdas or list comprehensions
By : Dave63043
Date : March 29 2020, 07:55 AM
hop of those help? You could collect the dictionaries to OrderedDict where key is the store and value is the lowest price. Then you can easily reconstruct the dictionaries with list comprehension:

Python: Finding random ksubset partition for a given list
By : user5723502
Date : March 29 2020, 07:55 AM
wish of those help You can count Stirling numbers efficiently with a recursive algorithm by storing previously computed values:

