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Variable declared in for-loop is local variable?
I have been using C# for quite a long time but never realised the following:
9 Answers
...
What are the file limits in Git (number and size)?
...CVS, ie it really ends up being pretty much oriented to a "one file
at a time" model.
Which is nice in that you can have a million files, and then only check
out a few of them - you'll never even see the impact of the other
999,995 files.
Git
fundamentally never really looks at les...
Reading a file line by line in Go
... in bufio.Reader
In my testcase, ~250MB, ~2,500,000 lines, bufio.Scanner(time used: 0.395491384s) is faster than bufio.Reader.ReadString(time_used: 0.446867622s).
Source code: https://github.com/xpzouying/go-practice/tree/master/read_file_line_by_line
Read file use bufio.Scanner,
func scanFile(...
How to convert a string to lower case in Bash?
...A FEW WORDS
Toggle (undocumented, but optionally configurable at compile time)
$ string="A Few Words"
$ echo "${string~~}"
a fEW wORDS
$ string="A FEW WORDS"
$ echo "${string~}"
a FEW WORDS
$ string="a few words"
$ echo "${string~}"
A few words
Capitalize (undocumented, but optionally configura...
Why do we copy then move?
...ion gets us nearly the same performance as the most-optimal version, but 2 times less code.
And if you are taking say 2 to 10 arguments, the reduction in code is exponential -- 2x times less with 1 argument, 4x with 2, 8x with 3, 16x with 4, 1024x with 10 arguments.
Now, we can get around this via...
What are some (concrete) use-cases for metaclasses?
...hrough all the class attributes and all its base classes' attributes every time):
>>> class A(Model):
... foo = Integer()
...
>>> class B(A):
... bar = String()
...
>>> B._fields
{'foo': Integer('A.foo'), 'bar': String('B.bar')}
Again, this can be done (without ...
Rename specific column(s) in pandas
... name
df.columns = [col_dict.get(x, x) for x in df.columns]
Timings:
%%timeit
df.rename(columns={'gdp':'log(gdp)'}, inplace=True)
10000 loops, best of 3: 168 µs per loop
%%timeit
df.columns = ['log(gdp)' if x=='gdp' else x for x in df.columns]
10000 loops, best of 3: 58.5 µs per loop
...
How do you find the row count for all your tables in Postgres
... count for all my tables in Postgres. I know I can do this one table at a time with:
15 Answers
...
UIView frame, bounds and center
...
Since the question I asked has been seen many times I will provide a detailed answer of it. Feel free to modify it if you want to add more correct content.
First a recap on the question: frame, bounds and center and theirs relationships.
Frame A view's frame (CGRect) i...
How to filter Android logcat by application? [duplicate]
...at. I use this with logcat-color to get it nicely colorised along with the timestamps too then command looks like this: logcat-color -v time *:v | grep adb shell ps | grep com.alrimal | cut -c10-15
– Dragan Marjanović
Jan 19 '15 at 10:10
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