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Replacing Pandas or Numpy Nan with a None to use with MysqlDB
...[2]:
0
0 1
1 NaN
In [3]: df1 = df.where(pd.notnull(df), None)
In [4]: df1
Out[4]:
0
0 1
1 None
Note: what you cannot do recast the DataFrames dtype to allow all datatypes types, using astype, and then the DataFrame fillna method:
df1 = df.astype(object).replace(np.nan, 'Non...
Using python map and other functional tools
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54
The easiest way would be not to pass bars through the different functions, but to access it dire...
How do I parallelize a simple Python loop?
...est using the multiprocessing module instead:
pool = multiprocessing.Pool(4)
out1, out2, out3 = zip(*pool.map(calc_stuff, range(0, 10 * offset, offset)))
Note that this won't work in the interactive interpreter.
To avoid the usual FUD around the GIL: There wouldn't be any advantage to using thre...
AngularJS : Factory and Service? [duplicate]
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4 Answers
4
Active
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Bootstrap NavBar with left, center or right aligned items
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848
2019 Update
Bootstrap 4
Now that Bootstrap 4 has flexbox, Navbar alignment is much easier. He...
Using 'starts with' selector on individual class names
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Josh StodolaJosh Stodola
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...
How can I get the SQL of a PreparedStatement?
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174
Using prepared statements, there is no "SQL query" :
You have a statement, containing placehol...
How can I configure the font size for the tree item in the package explorer in Eclipse?
...s a policy decision on the part of the Eclipse developers (see, e.g., bugs 49548, 202091). (Grumble.) The font used is the one set by the general look-and-feel for whatever desktop you are using.
On Linux it is possible to override the system font when you invoke Eclipse. An excellent writeup of va...
Different floating point result with optimization enabled - compiler bug?
...sors use 80-bit extended precision internally, whereas double is normally 64-bit wide. Different optimization levels affect how often floating point values from CPU get saved into memory and thus rounded from 80-bit precision to 64-bit precision.
Use the -ffloat-store gcc option to get the same flo...
Looping through the content of a file in Bash
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rogerdpack
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answered Oct 5 '09 at 18:00
Bruno De Fr...