从列表中删除项目

嘿,我想从列表中删除一个项目(不使用 set ):

list1 = []
for i in range(2,101):
    for j in range(2,101):
        list1.append(i ** j)
list1.sort()
for k in range(1,len(list1) - 1):
    if (list1[k] == list1[k - 1]):
        list1.remove(list1[k])
print "length = " + str(len(list1))

这个 函数运行良好,但我想应用此方法。但我得到:

 IndexError: list index out of range

 if (list1[k] == list1[k - 1]):

编辑以添加 (感谢Ned Batchelder)工作代码是:

list1 = []
for i in range(2,101):
 for j in range(2,101):
   list1.append(i ** j)
list1.sort()
k = 0
while k < len(list1) - 1: # while loop instead of for loop because "The range function is evaluated once before the loop is entered"
 k += 1
 if (list1[k] == list1[k - 1]):
  list1.remove(list1[k])
  list1.sort()
  k -= 1 # "If you find a duplicate, you don't want to move onto the next iteration, since you'll miss potential runs of more than two duplicates"
print "length = " + str(len(list1))