[英]Questions about the function of Sine, Cosine, and Tangent in Python
[英]questions about filter function in python
def empty(s):
return s and s.strip()
print(list(filter(empty,['A','B',' C '])))
Operation results :['A', 'B', ' C '] I was so confused about " C " In my opinion: s.strip() cause to delete space of the " C " and return "C",function will返回false,过滤器将消除它。 所以结果应该是['A','B']?
我的英语不好,我想把困惑说清楚。
如果要消除其中包含空格的所有值,为什么不使用以下 function:
def no_spaces(s):
# checks if there is a space in s
if " " in s:
return False
return True
print(list(filter(no_spaces,['A','B',' C ']))) # returns ['A', 'B']
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