从字符串列表中删除空字符串

Question

从字符串列表中删除空字符串我希望从python中的字符串列表中删除所有空字符串。我的想法是这样的：while '' in str_list:     str_list.remove('')还有更多的仿生方法吗？

Answer 1

我会用filter:

str_list = filter(None, str_list) # fastest

str_list = filter(bool, str_list) # fastest

str_list = filter(len, str_list)  # a bit slower

str_list = filter(lambda item: item, str_list) # slower than list comprehension

Python 3返回一个迭代器。filter，所以应该在调用list()

str_list = list(filter(None, str_list)) # fastest

(等。)

测试：

>>> timeit('filter(None, str_list)', 'str_list=["a"]*1000', number=100000)

2.4797441959381104

>>> timeit('filter(bool, str_list)', 'str_list=["a"]*1000', number=100000)

2.4788150787353516

>>> timeit('filter(len, str_list)', 'str_list=["a"]*1000', number=100000)

5.2126238346099854

>>> timeit('[x for x in str_list if x]', 'str_list=["a"]*1000', number=100000)

13.354584932327271

>>> timeit('filter(lambda item: item, str_list)', 'str_list=["a"]*1000', number=100000)

17.427681922912598

Answer 2

清单理解

strings = ["first", "", "second"][x for x in strings if x]

产出：['first', 'second']

编辑：按建议缩短