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In STL maps, is it better to use map::insert than []?
...els natural and is clear to read whereas he preferred map.insert(std::make_pair(key, value)) .
13 Answers
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Some built-in to pad a list in python
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a += [''] * (N - len(a))
or if you don't want to change a in place
new_a = a + [''] * (N - len(a))
you can always create a subclass of list and call the method whatever you please
class MyList(list):
def ljust(self, n, fillvalue=''):
return self + [fillvalue] * (n - len(self))
a...
string.ToLower() and string.ToLowerInvariant()
...d is recommended when a collection of strings must appear in a predictable order in a user interface control.
also
...ToLower is very similar in most places to ToLowerInvariant. The documents indicate that these methods will only change behavior with Turkish cultures. Also, on Windows systems...
Function that creates a timestamp in c#
...give you a string like 200905211035131468, as the string goes from highest order bits of the timestamp to lowest order simple string sorting in your SQL queries can be used to order by date if you're sticking values in a database
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Add one row to pandas DataFrame
...ept when I created the data frame, the columns names were all in the wrong order...
– user5359531
Aug 9 '16 at 21:36
5
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How do I pass a command line argument while starting up GDB in Linux? [duplicate]
...art of my assignment. However, I must first pass command line arguments in order to solve this problem.
4 Answers
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Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
...lexibility in terms of what kind of comparisons are allowed (e.g. changing order of elements of each vector, changing order and names of variables, shortening variables, changing case of strings). From this, you should be able to figure out what was missing from one or the other. For example (this i...
Migrating from JSF 1.2 to JSF 2.0
...ava.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
version="2.0">
Note: when you're using JSF 2.2 or newer, use the http://xmlns.jcp.org namespace domain instead of http://java.sun.com throughout the above XML snippet.
Ensure that root declaration of web.xm...
SQL - Rounding off to 2 decimal places
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Seems to convert to string ? which screws up order by.
– blissweb
Mar 4 '18 at 2:08
2
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MySQL DISTINCT on a GROUP_CONCAT()
...UP_CONCAT has DISTINCT attribute:
SELECT GROUP_CONCAT(DISTINCT categories ORDER BY categories ASC SEPARATOR ' ') FROM table
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