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How to count the frequency of the elements in an unordered list?
...the list before using groupby.
You can use groupby from itertools package if the list is an ordered list.
a = [1,1,1,1,2,2,2,2,3,3,4,5,5]
from itertools import groupby
[len(list(group)) for key, group in groupby(a)]
Output:
[4, 4, 2, 1, 2]
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Best data type to store money values in MySQL
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what could be the difference between decimal and numeric data type for this case?
– Emilio Gort
Feb 6 '14 at 20:04
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How to remove focus border (outline) around text/input boxes? (Chrome) [duplicate]
... have a hard time seeing which link/item is highlighted when they hit tab. If anything, the highlighting of the element should be enhanced to make it more obvious which item has focus.
– Torkil Johnsen
Jul 25 '14 at 12:46
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Get list from pandas DataFrame column headers
...returns an array and this has a helper function .tolist to return a list.
If performance is not as important to you, Index objects define a .tolist() method that you can call directly:
my_dataframe.columns.tolist()
The difference in performance is obvious:
%timeit df.columns.tolist()
16.7 µs ...
How to get Url Hash (#) from server side
...hash" so we can find it easily later.
On the server you can use this value if you need to do something with it. You can even change it if you need to.
On page load on the client, check the value of this this hidden field. You will want to find it by the DIV it is contained in as the auto-generated I...
How to get a complete list of object's methods and attributes?
...rns the keys in the __dict__ attribute, i.e. all the attributes accessible if the __getattr__ method is not reimplemented.
For the second question, it does not really make sense. Actually, methods are callable attributes, nothing more. You could though filter callable attributes, and, using the ins...
Why is there no tuple comprehension in Python?
...n is just syntactic sugar to use a generator expression that outputs a specific type. list(i for i in (1, 2, 3)) is a generator expression that outputs a list, set(i for i in (1, 2, 3)) outputs a set. Does that mean the comprehension syntax is not needed? Perhaps not, but it is awfully handy. For th...
What is the difference between ndarray and array in numpy?
What is the difference between ndarray and array in Numpy? And where can I find the implementations in the numpy source code?
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how to convert array values from string to int?
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but if you have string 'test', you got: array([0]=> 0 )
– Dmitry Dubovitsky
Oct 9 '13 at 13:39
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How to define a preprocessor symbol in Xcode
...is:
constant_1=VALUE constant_2=VALUE
Note that you don't need the '='s if you just want to #define a symbol, rather than giving it a value (for #ifdef statements)
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