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问题 Whenever i execute the code below it gives me following Error: ImportError: cannot import name 'Serial' from 'serial' (unknown location) Code: from serial import Serial arduinodata = Serial('com4',9600) print("Enter n to ON LED and f to OFF LED") while 1: input_data = raw_input() print ("You Entered"+input_data) if (input_data == 'n'): arduinodata.write(b'1') print("LED ON") if (input_data == 'f'): arduinodata.write(b'0') print("LED OFF") I have installed all the required python modules. Like

问题 I am using devtools to build my R package, and use the function check to check the package (with a long list of outputs on screen). However, because my package includes examples, and some of the examples are time-consuming, I am wondering how can I suppress checking examples when checking the package in devtools . The check function itself seems to not have such option. Thanks! 回答1: You need to set the args argument appropriately with command line arguments to R CMD check . The latter has -

问题 I am using devtools to build my R package, and use the function check to check the package (with a long list of outputs on screen). However, because my package includes examples, and some of the examples are time-consuming, I am wondering how can I suppress checking examples when checking the package in devtools . The check function itself seems to not have such option. Thanks! 回答1: You need to set the args argument appropriately with command line arguments to R CMD check . The latter has -

问题 When import sub module from a package, the __init__.py file in the package folder will be exec first, how can I disable this. Sometimes I only need one function in a package, import the whole package is a little heavy. For example the pandas.io.clipboard module doesn't dependent on any other functions in pandas. from pandas.io.clipboard import clipboard_get will import the function, but also import all the pandas common modules. Are there some method that just import the clipboard module, as

问题 When import sub module from a package, the __init__.py file in the package folder will be exec first, how can I disable this. Sometimes I only need one function in a package, import the whole package is a little heavy. For example the pandas.io.clipboard module doesn't dependent on any other functions in pandas. from pandas.io.clipboard import clipboard_get will import the function, but also import all the pandas common modules. Are there some method that just import the clipboard module, as

问题 I have the following directory structure: py_test ├── __init__.py ├── dir1 │ ├── __init__.py │ └── script1.py └── dir2 ├── __init__.py └── script2.py In script2 I want to " import ..\script1 ". What I tried in script2 : Does not work from ..dir1 import script1 ImportError: attempted relative import with no known parent package` Works import sys, os path2add = os.path.normpath(os.path.abspath(os.path.join(os.path.dirname(__file__), os.path.pardir, 'dir1'))) if (not (path2add in sys.path)) :

问题 I wrote a function to run R parallel, but it doesn't seem to work. The code is ''' rm(list=ls()) square<-function(x){ library(Iso) y=ufit(x,lmode<-2,x<-c(1:length(x)),type="b")[[2]] return(y) } num<-c(1,2,1,4) cl <- makeCluster(getOption("cl.cores",2)) clusterExport(cl,"square") results<-parLapply(cl,num,square) stopCluster(cl) ''' and the error is: Error in checkForRemoteErrors(val) : 2 nodes produced errors; first error: cannot open the connection I think a possible reason is that I used

问题 I wrote a function to run R parallel, but it doesn't seem to work. The code is ''' rm(list=ls()) square<-function(x){ library(Iso) y=ufit(x,lmode<-2,x<-c(1:length(x)),type="b")[[2]] return(y) } num<-c(1,2,1,4) cl <- makeCluster(getOption("cl.cores",2)) clusterExport(cl,"square") results<-parLapply(cl,num,square) stopCluster(cl) ''' and the error is: Error in checkForRemoteErrors(val) : 2 nodes produced errors; first error: cannot open the connection I think a possible reason is that I used

问题 The package is available on this website. http://cran.r-project.org/src/contrib/Archive/rlandscape/ When I use: install.packages("rlandscape", repos = "http://cran.r-project.org/src/contrib/Archive/rlandscape/", type="source") I get the following error: package 'rlandscape' is not available (for R version 3.1.2) I have tried older versions too but no luck.. 回答1: This is an old (archived) package that is no longer supported. If you really need it, you can install it using R CMD INSTALL but you

问题 The package is available on this website. http://cran.r-project.org/src/contrib/Archive/rlandscape/ When I use: install.packages("rlandscape", repos = "http://cran.r-project.org/src/contrib/Archive/rlandscape/", type="source") I get the following error: package 'rlandscape' is not available (for R version 3.1.2) I have tried older versions too but no luck.. 回答1: This is an old (archived) package that is no longer supported. If you really need it, you can install it using R CMD INSTALL but you