output | 易学教程

How can I do an atomic write to stdout in python?

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问题 I've read in some sources that the print command is not thread-safe and the workaround is to use sys.stdout.write command instead, but still it doesn't work for me and the writing to the STDOUT isn't atomic. Here's a short example (called this file parallelExperiment.py): import os import sys from multiprocessing import Pool def output(msg): msg = '%s%s' % (msg, os.linesep) sys.stdout.write(msg) def func(input): output(u'pid:%d got input \"%s\"' % (os.getpid(), str(input))) def

Difference between std::string and std::u16string (or u32string)

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问题 I have referred below posts before asking here: std::string, wstring, u16/32string clarification std::u16string, std::u32string, std::string, length(), size(), codepoints and characters But they don't my question. Look at the simple code below: #include<iostream> #include<string> using namespace std; int main () { char16_t x[] = { 'a', 'b', 'c', 0 }; u16string arr = x; cout << "arr.length = " << arr.length() << endl; for(auto i : arr) cout << i << "\n"; } The output is: arr.length = 3 // a +

Outputting a Dataframe in R to a .csv

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问题 So I'm trying to write a .csv file based on a data frame in R, but for some reason I keep getting the following error: Error in .External2(C_writetable, x, file, nrow(x), p, rnames, sep, eol, : unimplemented type 'list' in 'EncodeElement This is what traceback() is giving: 5: write.table(df, file = "df.csv", col.names = NA, sep = ",", dec = ".", qmethod = "double") 4: eval(expr, envir, enclos) 3: eval(expr, p) 2: eval.parent(Call) 1: write.csv(df, file = "df.csv") Any solution? 回答1: One of

Suppress output from non-PowerShell commands?

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问题 I am running a command hg st and then checking it's $LASTEXITCODE to check for availability of mercurial in the current directory. I do not care about its output and do not want to show it to my users. How do I suppress ALL output, success or error? Since mercurial isn't a PowerShell commandlet hg st | Out-Null does not work. 回答1: Out-Null works just fine with non-PowerShell commands. However, it doesn't suppress output on STDERR , only on STDOUT . If you want to suppress output on STDERR as

Eclipse Console not showing output

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问题 I have written a simple class having an SOP statement for "Hello World". But the Eclipse console is not showing output. I then wrote the same program in a previously created project and it worked fine. I am opening the Console as given below: Window->Show View->Console. But it is not working. I am using j2ee project in the same workspace. Any idea? Please help. I am stuck because of this problem. 回答1: Go to "Window > Reset Perspective", that will reset the window settings to default. Next,

Printing to a file in C

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问题 How do I print to an empty .txt file I already have created? I already print the results to the console, and now I want to print to a file named "Output.txt" . I've tried a couple of things that haven't worked, but I think it was easier to create a duplicate printDictionary() specifically for printing to a file called printDictionaryToFile() . I'm a little lost on how to do it though. Can anyone correct me on where I went wrong? I already added an extra FILE type called *out for my output to

Function as an output argument

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问题 I want to create a subroutine that gives back a function as an output. How can I do that? I'll put an example of how I think it should be (I know it's badly written) module fun_out contains subroutine exponential(F,a) interface, intent(out) function f(x) real, intent(in)::x real :: f(2) end function end interface real,intent(in):: a F=exp(a*x) end subroutine exponential end module With this I should take a function from the exponential family in the output. 回答1: You would have to return a

PHP How can close the html tags from this array?

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I have that array with html tags and i need make an output with some function with PHP but i can not make it correct i need some help to make this array closing tags correct. This array is already builded line by line but i can not make the parents. The OUTPUT NEEDED: <form class="form-horizontal"> <div class="firstclass">FIRSTCLASS</div> <div class="form-group"> <label class="col-sm-3 control-label">TEXT <div class="col-sm-9"> <span class="myspan">MYSPAN <div class="myclass">MYCLASS </div> </span> </div> </label> </div> <div class="firstclass">FIRSTCLASS</div> <div class="form-group"> <label

Snakemake: Error when trying to generate multiple output files

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问题 I'm writing a snakemake pipeline to take publicly available sra files, convert them to fastq files then run them through alignment, peak calling and LD score regression. I'm having an issue in the rule called SRA2fastq below in which I use parallel-fastq-dump to convert SRA files to paired end fastq files. This rule generates two outputs for each SRA file, SRRXXXXXXX_1 , and SRRXXXXXXX_2 . Here is my config file: samples: fullard2018_NpfcATAC_1: SRR5367824 fullard2018_NpfcATAC_2: SRR5367798

jupyter input,display, print excute order is chaotic

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问题 I'am using jupyter and my python version is 3.5. In a while loop, excute order is not correct, input statement is before print statement. This is my code. from IPython.display import display import pandas as pd df = pd.DataFrame({'a':[1,2],'b':[3,4]}) while(True): a = input("please input:\n") display(df.head()) print (a) The excute result is 回答1: I was able to reproduce the behavior under Chrome 63 on OSX. I added several more consecutive print(a) statements and where the input field ends up