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What is the difference between '/' and '//' when used for division?
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13 Answers
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Validating IPv4 addresses with regexp
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36 Answers
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Find element's index in pandas Series
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>>> myseries[myseries == 7]
3 7
dtype: int64
>>> myseries[myseries == 7].index[0]
3
Though I admit that there should be a better way to do that, but this at least avoids iterating and looping through the object and moves it to the C level....
Extract first item of each sublist
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Using list comprehension:
>>> lst = [['a','b','c'], [1,2,3], ['x','y','z']]
>>> lst2 = [item[0] for item in lst]
>>> lst2
['a', 1, 'x']
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Python dictionary: Get list of values for list of keys
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213
A list comprehension seems to be a good way to do this:
>>> [mydict[x] for x in mykeys...
用矩阵管理成绩表 - App Inventor 2 矩阵块入门案例 · App Inventor 2 中文网
...：把成绩表装进矩阵
第 2 关：查任意一格的成绩
第 3 关：改成绩（原地修改）
第 4 关：算某一行（某名学生）的平均分
第 5 关：整表转置，横过来看
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Difference between `set`, `setq`, and `setf` in Common Lisp?
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173
Originally, in Lisp, there were no lexical variables -- only dynamic ones. And
there was no SETQ...
LISTAGG in Oracle to return distinct values
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edited Apr 13 '19 at 23:57
Jon Heller
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How to make lists contain only distinct element in Python? [duplicate]
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Mark ByersMark Byers
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Formatting floats without trailing zeros
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