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What is the purpose of the single underscore “_” variable in Python?
...ing
x, _, y = (1, 2, 3)
>>> x
1
>>> y
3
Ignore the index
for _ in range(10):
do_something()
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Is it possible to specify the schema when connecting to postgres with JDBC?
...ch) to use it:
http://archives.postgresql.org/pgsql-jdbc/2008-07/msg00012.php
http://jdbc.postgresql.org/
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Rolling or sliding window iterator?
...near the beginning are faster, or items near the end if you use a negative index.) I put a sum(w) in the body of my loop; this plays to the deque's strength (iterating from one item to the next is fast, so this loop ran a a full 20% faster than the next fastest method, pillmuncher's). When I change...
SQLite: How do I save the result of a query as a CSV file?
...')
df = pd.read_sql('SELECT * from orders', conn)
df.to_csv('orders.csv', index = False)
You can customize the query to only export part of the sqlite table to the CSV file.
You can also run a single command to export all sqlite tables to CSV files:
for table in c.execute("SELECT name FROM sqlite_...
The order of elements in Dictionary
...ost cases wrong. It is neither Ordered by key or value, but by an internal Index. SortedDictionary is the one which is ordered in a way the user can manipulate (default key)
– Offler
May 29 '15 at 9:01
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How to find index of all occurrences of element in array?
I am trying to find the index of all the instances of an element, say, "Nano", in a JavaScript array.
15 Answers
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Why use the INCLUDE clause when creating an index?
While studying for the 70-433 exam I noticed you can create a covering index in one of the following two ways.
8 Answers
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Can you find all classes in a package using reflection?
...ith it you can easily achieve what you want.
First, setup the reflections index (it's a bit messy since searching for all classes is disabled by default):
List<ClassLoader> classLoadersList = new LinkedList<ClassLoader>();
classLoadersList.add(ClasspathHelper.contextClassLoader());
cla...
Iterating over all the keys of a map
...t for _, k := range v.MapKeys(), since in your example, k would be the int index of the slice of keys
– Brian Leishman
Apr 23 '19 at 14:05
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Precedence and bitmask operations
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You are actually doing this:
var_dump(0b10 & (0b01 == 0));
var_dump(0b10 & (0b01 != 0));
Try:
var_dump((0b10 & 0b01) == 0);
var_dump((0b10 & 0b01) != 0);
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