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Substitute multiple whitespace with single whitespace in Python [duplicate]
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A simple possibility (if you'd rather avoid REs) is
' '.join(mystring.split())
The split and join perform the task you're explicitly asking about -- plus, they also do the extra one that you don't talk about but is seen in your example, removin...
Cannot install packages using node package manager in Ubuntu
... can copy that info into the comments in my environment setup script so I know what's going on a year from now when it doesn't work.
– Mnebuerquo
Oct 8 '14 at 18:28
29
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What is x after “x = x++”?
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I know this is super old, but I have a question. Is the above order of operation guaranteed by the standard? Is it possible that the assignment is executed before the increment?
– Emerald Weapon
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In MySQL, can I copy one row to insert into the same table?
...y = NULL;
INSERT INTO table SELECT * FROM tmptable_1;
DROP TEMPORARY TABLE IF EXISTS tmptable_1;
As a temp table, there should never be more than one record, so you don't have to worry about the primary key. Setting it to null allows MySQL to choose the value itself, so there's no risk of creating...
How to loop through all the properties of a class?
... there is no "System.Reflection" entry in the list
Edit: You can also specify a BindingFlags value to type.GetProperties():
BindingFlags flags = BindingFlags.Public | BindingFlags.Instance;
PropertyInfo[] properties = type.GetProperties(flags);
That will restrict the returned properties to publi...
Polymorphism in C++
...opriate code.
C++ mechanisms for polymorphism
Explicit programmer-specified polymorphism
You can write f() such that it can operate on multiple types in any of the following ways:
Preprocessing:
#define f(X) ((X) += 2)
// (note: in real code, use a longer uppercase name for a macro!)
Overl...
How does a public key verify a signature?
... key to obtain a message, supposedly the same message as (1) but we don't know yet. We now have two messages that we need to verify are identical. So to do this, we will encrypt them both with our public key and compare the two hashes. So we will ....
Encrypt the original message (1) with the public...
pydot and graphviz error: Couldn't import dot_parser, loading of dot files will not be possible
...on of pyparsing:
pip install pyparsing==1.5.7
pip install pydot==1.0.28
If you did not install pyparsing using pip, but instead used setup.py, then have a look at this solution to uninstall the package. Thanks @qtips.
sha...
urllib2.HTTPError: HTTP Error 403: Forbidden
...I am unable to open using urllib2. I have tried changing user agent as specified in few questions earlier, I even tried to accept response cookies, with no luck. Can you please help.
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java: HashMap not working
...mple
Map<String,Integer> m = new HashMap<String,Integer>();
Now both are objects, so this will work.
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