I have tried to figure this out in different ways, to no success. I keep getting ascending order sort, rather than descending order when I print.
ListB = [24, 13, -15, -36, 8, 22, 48, 25, 46, -9]
sorted(ListB, key=int, reverse=True)
print sorted(ListB)
7 Answers
You are printing the list sorted ascending:
print sorted(ListB)
If you want it descending, put your print statement on the previous line (where you reverse it)
print sorted(ListB, key=int, reverse=True)
Then remove your final print statement.
Example:
>>> ListB = [24, 13, -15, -36, 8, 22, 48, 25, 46, -9]
>>> print sorted(ListB, key=int, reverse=True)
[48, 46, 25, 24, 22, 13, 8, -9, -15, -36]
Try this, it'll sort the list in-place in descending order (there's no need to specify a key in this case):
listB = [24, 13, -15, -36, 8, 22, 48, 25, 46, -9]
listB.sort(reverse=True) # listB gets modified
print listB
=> [48, 46, 25, 24, 22, 13, 8, -9, -15, -36]
Alternatively, you can create a new sorted list:
listB = [24, 13, -15, -36, 8, 22, 48, 25, 46, -9]
listC = sorted(listB, reverse=True) # listB remains untouched
print listC
=> [48, 46, 25, 24, 22, 13, 8, -9, -15, -36]
ListB = [24, 13, -15, -36, 8, 22, 48, 25, 46, -9]
ListB = sorted(ListB, key=int, reverse=True)
print ListB
Sorted does not change the variable passed to it. So if you want to do anything with them you have to store sorted output into a variable.
reversed(sorted(listb))
This creates an iterable going from 48 -> -36
u should have combined these two lines of code together, using this instead.
print sorted(ListB, key=int, reverse=True)
result:
[48, 46, 25, 24, 22, 13, 8, -9, -15, -36]
In Python you can sort as follows:
listA = [150, 120, 100, 165, 190, 145, 182, 175, 17]
print(sorted(listA))
print(sorted(listA, reverse=True))
This would be the actual implementation using selection sort:
# Traverse through all array elements
for i in range(len(listA)):
# Find the minimum element in remaining
# unsorted array
min_idx = i
for j in range(i + 1, len(listA)):
if listA[min_idx] > listA[j]:
min_idx = j
# Swap the found minimum element with
# the first element
listA[i], listA[min_idx] = listA[min_idx], listA[i]
print(listA)
# Traverse through all array elements
for i in range(len(listA)):
# Find the minimum element in remaining
# unsorted array
min_idx = i
for j in range(i + 1, len(listA)):
if listA[min_idx] < listA[j]:
min_idx = j
# Swap the found minimum element with
# the first element
listA[i], listA[min_idx] = listA[min_idx], listA[i]
print(listA)
ListB = [24, 13, -15, -36, 8, 22, 48, 25, 46, -9]
ListB.sort()
print(ListB[::-1])
This should work
