code. compile. run. debug. share.
def removeEmpties(lol):
colsCnt = len(lol[0])
emptyRow = [None]*colsCnt
# first remove all rows containing only None elements
lol2 = list(lst for lst in lol if lst!=emptyRow)
# second go through by columm
for col in range(colsCnt-1,-1,-1):
# and now look at that column in every row
for row in lol2:
# if an element in the current row is not None in that column
if row[col] is not None:
# we do not need to look any further,
# since this column has to remain
break;
else:
# if we could not find any non-None element,
# this column must be removed from all rows.
for row in lol2:
del row[col]
return lol2
print(removeEmpties([['a' ,None,'c' ],
[None,None,None],
['g' ,None,'i' ],
['j' ,None,None]]))
print(removeEmpties([['a' ,None,'c' ],
[None,None,None],
['g' ,None,'i' ],
['j' ,None,'None']]))
Compiling Program...
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Text
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