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How to modify a text file?
... beginning or the middle, you'll have to rewrite it.
This is an operating system thing, not a Python thing. It is the same in all languages.
What I usually do is read from the file, make the modifications and write it out to a new file called myfile.txt.tmp or something like that. This is better t...
uint8_t can't be printed with cout
...es, most of them below value 32, which is the blank actually.
You have to convert aa to unsigned int to output the numeric value, since ostream& operator<<(ostream&, unsigned char) tries to output the visible character value.
uint8_t aa=5;
cout << "value is " << unsigned...
Get class that defined method
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In Python 3, if you need the actual class object you can do:
import sys
f = Foo.my_function
vars(sys.modules[f.__module__])[f.__qualname__.split('.')[0]] # Gets Foo object
If the function could belong to a nested class you would need to iterate as follows:
f = Foo.Bar.my_function
vals = v...
The tilde operator in C
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@MarcusJ Yes, one's complement works for converting signed to unsigned (signed->unsigned). (Note though it's easier to just assign the value to a variable declared differently and lett the compiler worry about it.) But it does not work the other way around (unsig...
Java lib or app to convert CSV to XML file? [closed]
... there an existing application or library in Java which will allow me to convert a CSV data file to XML file?
16 An...
Remove element of a regular array
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@MartinBrown Actually, converting a list to\from and array is much slower than an array copy (which is able to copy the data at the max speed allowed by the CPU with just a few ASM instructions). Also, shifting a list is very fast because it is ju...
What does !! mean in ruby?
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Not not. It's used to convert a value to a boolean:
!!nil #=> false
!!"abc" #=> true
!!false #=> false
It's usually not necessary to use though since the only false values to Ruby are nil and false, so it's usually best to let that c...
Sort a Custom Class List
...}
Only thing you'd have to do when creating the instance of the class to convert your string containing the date into DateTime type, but it can be done easily e.g. by DateTime.Parse(String) method.
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Backporting Python 3 open(encoding=“utf-8”) to Python 2
...ython 2.6 and 2.7 you can use io.open instead of open. io is the new io subsystem for Python 3, and it exists in Python 2,6 ans 2.7 as well. Please be aware that in Python 2.6 (as well as 3.0) it's implemented purely in python and very slow, so if you need speed in reading files, it's not a good opt...
How to append rows to an R data frame
...m:
You should use stringsAsFactors if you want the characters to not get converted to factors. Use: df = data.frame(x = numeric(), y = character(), stringsAsFactors = FALSE)
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