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Double Iteration in List Comprehension
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I hope this helps someone else since a,b,x,y don't have much meaning to me! Suppose you have a text full of sentences and you want an array of words.
# Without list comprehension
list_of_words = []
for sentence in text:
for word in sentence:
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How do I (or can I) SELECT DISTINCT on multiple columns?
...ND s1.ctid <> s.ctid
Every table should have a primary key. Add one if you didn't have one, yet. I suggest a serial or an IDENTITY column in Postgres 10+.
Related:
In-order sequence generation
Auto increment table column
How is this faster?
The subquery in the EXISTS anti-semi-join ...
Using global variables between files?
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wow, normally one would expect two files importing each other to get into an infinite loop.
– Nikhil VJ
Aug 24 '18 at 4:11
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What is the difference between `new Object()` and object literal notation?
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They both do the same thing (unless someone's done something unusual), other than that your second one creates an object and adds a property to it. But literal notation takes less space in the source code. It's clearly recognizable as to what is happening, so usin...
python numpy ValueError: operands could not be broadcast together with shapes
...hape (97,2)
y, shape (2,1)
With Numpy arrays, the operation
X * y
is done element-wise, but one or both of the values can be expanded in one or more dimensions to make them compatible. This operation are called broadcasting. Dimensions where size is 1 or which are missing can be used in broadca...
Can I control the location of .NET user settings to avoid losing settings on application upgrade?
... answered Mar 7 '09 at 4:40
uzbonesuzbones
1,38699 silver badges1515 bronze badges
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Is it possible to implement a Python for range loop without an iterator variable?
...ason, I would not use it in this manner. I am unaware of any idiom as mentioned by Ryan. It can mess up your interpreter.
>>> for _ in xrange(10): pass
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>>> _
9
>>> 1+2
3
>>> _
9
And according to Python grammar, it is an acceptable variable name:
identifier...
How can I bring my application window to the front? [duplicate]
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of all the methods I've found using Google, and everyone's constant insistence that activation and focus where the key. This was the only approach that worked for me. Thank you, as I would never of thought of this trick.
– Reactgular
Sep 2...
Remove credentials from Git
...g with several repositories, but lately I was just working in our internal one and all was great.
35 Answers
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Code Golf: Collatz Conjecture
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why is this accepted? it's not the shortest one and it doesn't print the first number
– Claudiu
Mar 8 '10 at 6:25
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