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Regular expression for letters, numbers and - _

...he pattern you want is something like (see it on rubular.com): ^[a-zA-Z0-9_.-]*$ Explanation: ^ is the beginning of the line anchor $ is the end of the line anchor [...] is a character class definition * is "zero-or-more" repetition Note that the literal dash - is the last character in the ch...
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How to write header row with csv.DictWriter?

...od now available in 2.7 / 3.2: from collections import OrderedDict ordered_fieldnames = OrderedDict([('field1',None),('field2',None)]) with open(outfile,'wb') as fou: dw = csv.DictWriter(fou, delimiter='\t', fieldnames=ordered_fieldnames) dw.writeheader() # continue on to write data ...
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Python debugging tips [closed]

... PDB You can use the pdb module, insert pdb.set_trace() anywhere and it will function as a breakpoint. >>> import pdb >>> a="a string" >>> pdb.set_trace() --Return-- > <stdin>(1)<module>()->None (Pdb) p a 'a string' (Pdb) To...
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How to iterate for loop in reverse order in swift?

... an array with one trillion Ints! Test: var count = 0 for i in lazy(1...1_000_000_000_000).reverse() { if ++count > 5 { break } println(i) } For Swift 2.0 in Xcode 7: for i in (1...10).reverse() { print(i) } Note that in Swift 2.0, (1...1_000_000_000_000).reverse(...
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cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术

... cpuid cmp eax, 80000004h jb not_supported mov di, offset CPU_name mov eax, 80000002h cpuid call save_string mov eax, 80000003h cpuid ...
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Explicitly calling return in a function or not

...t return. The following plot is created from data selected this way: bench_nor2 <- function(x,repeats) { system.time(rep( # without explicit return (function(x) vector(length=x,mode="numeric"))(x) ,repeats)) } bench_ret2 <- function(x,repeats) { system.time(rep( # with explicit return (funct...
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“ImportError: No module named” when trying to run Python script

...d the folder in which you told the notebook to operate from in your ipython_notebook_config.py file (typically using the c.NotebookManager.notebook_dir setting). The solution is to provide the python interpreter with the path-to-your-module. The simplest solution is to append that path to your sys....
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What is the effect of extern “C” in C++?

...n it posted yet. You'll very often see code in C headers like so: #ifdef __cplusplus extern "C" { #endif // all of your legacy C code here #ifdef __cplusplus } #endif What this accomplishes is that it allows you to use that C header file with your C++ code, because the macro "__cplusplus" will...
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Decorators with parameters?

I have a problem with the transfer of variable 'insurance_mode' by the decorator. I would do it by the following decorator statement: ...
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What Process is using all of my disk IO

...[jdb2/nvme0n1p1] in iotop, but I got lucky with enabling /proc/sys/vm/block_dump and comparing the output to a healthy/stable system lxadm.com/Simple_filesystem_read/write_tracing_with_/proc/sys/… It helped find a docker container that was continuously spawning kubectl requests, exhausting an EBS ...