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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(...
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 ...
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
...
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
...
Are string.Equals() and == operator really same? [duplicate]
...an be overridden, and the implementation used will depend on the execution-time type of the target object), whereas the implementation of == used is determined based on the compile-time types of the objects:
// Avoid getting confused by interning
object x = new StringBuilder("hello").ToString();
ob...
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...
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
...
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...
How to sort an array in Bash
...ons, but you can use arithmetic comparisons, compare wrt file modification time, etc. just use the appropriate test; you can even make it more generic and have it use a first argument that is the test function use, e.g.,
#!/bin/bash
# quicksorts positional arguments
# return is in array qsort_ret
...
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...