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Print string to text file

... text_file = open("Output.txt", "w") text_file.write("Purchase Amount: %s" % TotalAmount) text_file.close() If you use a context manager, the file is closed automatically for you with open("Output.txt", "w") as text_file: t...
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Iterate keys in a C++ map

...te on the keys instead of the pairs), then take a look at Boost's transform_iterator. [Tip: when looking at Boost documentation for a new class, read the "examples" at the end first. You then have a sporting chance of figuring out what on earth the rest of it is talking about :-)] ...
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Equivalent C++ to Python generator pattern

...: // (implicit aliases) public std::iterator< std::input_iterator_tag, std::pair<unsigned, unsigned> > { // C++03 typedef void (PairSequence::*BoolLike)(); void non_comparable(); public: // C++11 (explicit aliases) using iterator_category = std::inpu...
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iOS start Background Thread

...ou'd probably be better off using Grand Central Dispatch, though: dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ [self getResultSetFromDB:docids]; }); GCD is a newer technology, and is more efficient in terms of memory overhead and lines of code. Updated w...
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How do I detect whether a Python variable is a function?

...obj) If this is for Python 3.x but before 3.2, check if the object has a __call__ attribute. You can do this with: hasattr(obj, '__call__') The oft-suggested types.FunctionTypes approach is not correct because it fails to cover many cases that you would presumably want it to pass, like with bui...
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What is the difference between partitioning and bucketing a table in Hive ?

...example, suppose a table using date as the top-level partition and employee_id as the second-level partition leads to too many small partitions. Instead, if we bucket the employee table and use employee_id as the bucketing column, the value of this column will be hashed by a user-defined number into...
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how to change any data type into a string in python

... you're writing your own class and you want str to work for you, add: def __str__(self): return "Some descriptive string" print str(myObj) will call myObj.__str__(). repr is a similar method, which generally produces information on the class info. For most core library object, repr produces ...
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specify project file of a solution using msbuild

...ains any of the characters %, $, @, ;, ., (, ), or ', replace them with an _ in the specified target name. You can also build multiple projects at once: msbuild test.sln /t:project;project2 /p:Configuration="Release" /p:Platform="x86" /p:BuildProjectReferences=false To rebuild or clean, change ...
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Call PowerShell script PS1 from another PS1 script inside Powershell ISE

...$ChromeInstallArgs= "/i", "$PSScriptRoot\googlechromestandaloneenterprise64_v.57.0.2987.110.msi", "/q", "/norestart", "/L*v `"C:\Windows\Logs\Google_Chrome_57.0.2987.110_Install_x64.log`"" Start-Process -FilePath msiexec -ArgumentList $ChromeInstallArgs -Wait -ErrorAction Stop $Result= [Syst...
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Random row selection in Pandas dataframe

... Thanks @eumiro. I also worked out that df.ix[np.random.random_integers(0, len(df), 10)] would also work. – John Apr 10 '13 at 10:58 7 ...