Python(2.6.6)for循环中的endswith()

Question

park = "a park.shp"
road = "the roads.shp"
school = "a school.shp"
train = "the train"
bus = "the bus.shp"
mall = "a mall"
ferry = "the ferry"
viaduct = "a viaduct"

dataList = [park, road, school, train, bus, mall, ferry, viaduct]

print dataList

for a in dataList:
    print a
    #if a.endswith(".shp"):
     #   dataList.remove(a)

print dataList

给出以下输出(因此循环正在工作并正确读取所有内容):

['a park.shp', 'the roads.shp', 'a school.shp', 'the train', 'the bus.shp', 'a mall', 'the ferry', 'a viaduct']
a park.shp
the roads.shp
a school.shp
the train
the bus.shp
a mall
the ferry
a viaduct
['a park.shp', 'the roads.shp', 'a school.shp', 'the train', 'the bus.shp', 'a mall', 'the ferry', 'a viaduct']

但是当我删除 # 标记来运行 if 语句时，它应该删除以 .shp 结尾的字符串，字符串 road 仍保留在列表中吗？

['a park.shp', 'the roads.shp', 'a school.shp', 'the train', 'the bus.shp', 'a mall', 'the ferry', 'a viaduct']
a park.shp
a school.shp
the bus.shp
the ferry
a viaduct
['the roads.shp', 'the train', 'a mall', 'the ferry', 'a viaduct']

我注意到的其他事情是，当它显然处于应该遍历每个字符串的 for 循环中时，它不会打印所有字符串？有人可以解释一下出了什么问题吗？循环保留了字符串路径，但找到了以 .shp 结尾的其他字符串并正确删除了它们？

谢谢， C

(仅供引用，这是在 Python 2.6.6 上，因为 Arc 10.0)

Answer 1

您正在改变列表并导致索引跳过。

使用这样的列表理解:

[d for d in dataList if not d.endswith('.shp')]

然后得到:

>>> ['the train', 'a mall', 'the ferry', 'a viaduct']