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What are bitwise operators?
... For example, reading an integer from four bytes:
int val = (A << 24) | (B << 16) | (C << 8) | D;
Assuming that A is the most-significant byte and D the least. It would end up as:
A = 01000000
B = 00000101
C = 00101011
D = 11100011
val = 01000000 00000101 00101011 11100011
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Re-ordering columns in pandas dataframe based on column name [duplicate]
...
gcamargo
2,22422 gold badges1717 silver badges3131 bronze badges
answered Jun 16 '12 at 21:12
BrenBarnBrenBarn
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How to add pandas data to an existing csv file?
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584
You can specify a python write mode in the pandas to_csv function. For append it is 'a'.
In you...
Reading a key from the Web.Config using ConfigurationManager
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483
Try using the WebConfigurationManager class instead. For example:
string userName = WebConfig...
How to remove focus border (outline) around text/input boxes? (Chrome) [duplicate]
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2442
This border is used to show that the element is focused (i.e. you can type in the input or pre...
Devise Secret Key was not set
I am developing a Rails 4 app using the Active Admin gem for the administration back end. Active Admin in turn uses Devise for user authentication. Now, when I try to deploy the app using capistrano on the VPS server, I get the below error:
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How to set the thumbnail image on HTML5 video?
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Add poster="placeholder.png" to the video tag.
<video width="470" height="255" poster="placeholder.png" controls>
<source src="video.mp4" type="video/mp4">
<source src="video.ogg" type="video/ogg">
<source src="video.webm" type="video/webm">
<obj...
Laravel: Get base url
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edited Oct 17 '14 at 10:31
answered Apr 14 '14 at 12:41
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How can I make Bootstrap columns all the same height?
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Solution 4 using Bootstrap 4
Bootstrap 4 uses Flexbox so there is no need for extra CSS.
Demo
<div class="container">
<div class="row ">
<div class="col-md-4" style="background-color: red">
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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...