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Convert text into number in MySQL query
Is it possible to convert text into number within MySQL query? I have a column with an identifier that consists a name and a number in the format of "name-number". The column has VARCHAR type. I want to sort the rows according the number (rows with the same name) but the column is sorted according d...
How to check if a python module exists without importing it
... but the eggs package could be found.
See the documentation of the import system for more info on the ModuleNotFoundError
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How to get the unix timestamp in C#
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Error for the second solution: Cannot convert source type 'double' to target type 'long'.
– Pixar
Sep 4 '15 at 15:45
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Using R to list all files with a specified extension
... so it will only pick out the file names that end in .dbf
filenames <- Sys.glob("*.dbf")
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Where is the itoa function in Linux?
itoa() is a really handy function to convert a number to a string. Linux does not seem to have itoa() , is there an equivalent function or do I have to use sprintf(str, "%d", num) ?
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How to modify a text file?
... beginning or the middle, you'll have to rewrite it.
This is an operating system thing, not a Python thing. It is the same in all languages.
What I usually do is read from the file, make the modifications and write it out to a new file called myfile.txt.tmp or something like that. This is better t...
(-2147483648> 0) returns true in C++?
...whose integer conversion rank (4.13) is less than the rank of
int can be converted to a prvalue of type int if int can represent all
the values of the source type; otherwise, the source prvalue can be
converted to a prvalue of type unsigned int.
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Is it better practice to use String.format over string Concatenation in Java?
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@AmirRaminar: The compiler converts "+" to calls to StringBuilder automatically.
– Martin Schröder
Feb 23 '12 at 14:50
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Get class that defined method
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In Python 3, if you need the actual class object you can do:
import sys
f = Foo.my_function
vars(sys.modules[f.__module__])[f.__qualname__.split('.')[0]] # Gets Foo object
If the function could belong to a nested class you would need to iterate as follows:
f = Foo.Bar.my_function
vals = v...
How can I truncate a double to only two decimal places in Java?
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Formating as a string and converting back to double i think will give you the result you want.
The double value will not be round(), floor() or ceil().
A quick fix for it could be:
String sValue = (String) String.format("%.2f", oldValue);
Double ...