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General Tech QA/Testing 2 years ago
Posted on 16 Aug 2022, this text provides information on QA/Testing related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I want to remove all empty strings from a list of strings in python.
My idea looks like this:
while '' in str_list: str_list.remove('')
Is there any more pythonic way to do this?
I would use filter:
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 returns an iterator from filter, so should be wrapped in a call to list()
list()
str_list = list(filter(None, str_list)) # fastest
(etc.)
Tests:
>>> 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
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