从列表列表中删除项目

Question

This is my original array:

b = [[], [1], [22, 132], [3, 123], [], [], [6], [], [], [89]]

This is what i want:

b = [[], [], [], [], [], [], [], [], [], []]

Answer 1

You need to loop over b , either setting each element to the empty list or deleting the contents of that element:

for i in xrange(len(b)):
  b[i] = []

or

for i in xrange(len(b)):
  del b[i][:]