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How can I combine two HashMap objects containing the same types?
... don't have duplicate keys, or you want values in map2 to overwrite values from map1 for duplicate keys, you can just write
map3 = new HashMap<>(map1);
map3.putAll(map2);
If you need more control over how values are combined, you can use Map.merge, added in Java 8, which uses a user-provide...
Difference between except: and except Exception as e: in Python
...
Well, there's no magic here. Exception is derived from BaseException, that's why except Exception does not catch BaseException. If you write except BaseException, it'll be caught too. Bare except just catches everything.
– fjarri
Sep 27...
avoid page break inside row of table
...ide: avoid !important;
margin: 4px 0 4px 0; /* to keep the page break from cutting too close to the text in the div */
}
</style>
Even though Chrome supposedly does not recognize the 'page-break-inside: avoid;' property, this seems to keep the row content from being split in half by a...
Difference between a Postback and a Callback
...
A Postback occurs when the data (the whole page) on the page is posted from the client to the server..ie the data is posted-back to the server, and thus the page is refreshed (redrawn)...think of it as 'sending the server the whole page (asp.net) full of data'.
On the other hand, a callback is ...
HTTP redirect: 301 (permanent) vs. 302 (temporary)
...ould not attempt to request the original location but use the new location from now on.
Status 302 means that the resource is temporarily located somewhere else, and the client/browser should continue requesting the original url.
...
how do you filter pandas dataframes by multiple columns
... (df[Year]==2014)]
To store your dataframes in a dict using a for loop:
from collections import defaultdict
dic={}
for g in ['male', 'female']:
dic[g]=defaultdict(dict)
for y in [2013, 2014]:
dic[g][y]=df[(df[Gender]==g) & (df[Year]==y)] #store the DataFrames to a dict of dict
EDIT:...
How do you determine the ideal buffer size when using FileInputStream?
I have a method that creates a MessageDigest (a hash) from a file, and I need to do this to a lot of files (>= 100,000). How big should I make the buffer used to read from the files to maximize performance?
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The following untracked working tree files would be overwritten by merge, but I don't care
...s, remove all of your local changes to those files, and then get the files from the server.
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Using Regular Expressions to Extract a Value in Java
...hed expression
System.out.println(m.group(1)); // first expression from round brackets (Testing)
System.out.println(m.group(2)); // second one (123)
System.out.println(m.group(3)); // third one (Testing)
}
}
Since you're looking for the first number, you can use such re...
What does passport.session() middleware do?
...e req object and change the 'user' value that is currently the session id (from the client cookie) into the true deserialized user object.
Whilst the other answers make some good points I thought that some more specific detail could be provided.
app.use(passport.session());
is equivalent to
ap...