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问题 In Windows, python 2.7, I had pip upgraded, and it showed: Successfully uninstalled pip-8.1.2 Successfully installed pip-19.3.1 But when: pip --version It shows: I tried to 'reverse' to the old version by: pip install pip==8.0.2 It shows the same error. Not sure it's about the python version. How can I correct this problem? Thank you. 回答1: You were right with trying to reinstall pip at an older verion; your installation is broken. I've looked around and the consensus is that you should do:

问题 In Windows, python 2.7, I had pip upgraded, and it showed: Successfully uninstalled pip-8.1.2 Successfully installed pip-19.3.1 But when: pip --version It shows: I tried to 'reverse' to the old version by: pip install pip==8.0.2 It shows the same error. Not sure it's about the python version. How can I correct this problem? Thank you. 回答1: You were right with trying to reinstall pip at an older verion; your installation is broken. I've looked around and the consensus is that you should do:

问题 I have an SSIS package that imports Excel files. Inside the package, I have a Script task that checks whether the Excel file exists or not before executing the Excel import process. I am unable to execute the package when the Excel file doesn't exist because of the AcquireConnection error. How can I prevent the package from executing when there is no Excel file available for import? 回答1: Perform the following steps to avoid the package from failing. Set the ValidateExternalMetadata property

问题 I have an SSIS package that imports Excel files. Inside the package, I have a Script task that checks whether the Excel file exists or not before executing the Excel import process. I am unable to execute the package when the Excel file doesn't exist because of the AcquireConnection error. How can I prevent the package from executing when there is no Excel file available for import? 回答1: Perform the following steps to avoid the package from failing. Set the ValidateExternalMetadata property

问题 I'm getting the following error when installing packages from github: > devtools::install_github("pmartinezarbizu/pairwiseAdonis/pairwiseAdonis") Downloading GitHub repo pmartinezarbizu/pairwiseAdonis@HEAD Erro: Failed to install 'pairwiseAdonis' from GitHub: System command 'Rcmd.exe' failed, exit status: -1, stdout + stderr empty With find_rtools, I get the following message (I was reading these posts, but couldn't solve my problem: https://github.com/r-lib/devtools/issues/2031 and R CMD

问题 I'm getting the following error when installing packages from github: > devtools::install_github("pmartinezarbizu/pairwiseAdonis/pairwiseAdonis") Downloading GitHub repo pmartinezarbizu/pairwiseAdonis@HEAD Erro: Failed to install 'pairwiseAdonis' from GitHub: System command 'Rcmd.exe' failed, exit status: -1, stdout + stderr empty With find_rtools, I get the following message (I was reading these posts, but couldn't solve my problem: https://github.com/r-lib/devtools/issues/2031 and R CMD

问题 Given these two evals which only change Module::FOO() and FOO() . # Symbols imported, and used locally. eval qq[ package Foo$num; Module->import(); my \$result = Module::FOO() * Module::FOO(); ] or die $@; # Symbols imported, not used locally referencing parent symbol. eval qq[ package Foo$num; Module->import(); my \$result = FOO() * FOO(); ] or die $@; why would the top block take up substantially less space? The script and output are reproduced below, Script package Module { use v5.30; use

问题 Given these two evals which only change Module::FOO() and FOO() . # Symbols imported, and used locally. eval qq[ package Foo$num; Module->import(); my \$result = Module::FOO() * Module::FOO(); ] or die $@; # Symbols imported, not used locally referencing parent symbol. eval qq[ package Foo$num; Module->import(); my \$result = FOO() * FOO(); ] or die $@; why would the top block take up substantially less space? The script and output are reproduced below, Script package Module { use v5.30; use

问题 Why do I have this error message : > vegan::reorder.hclust Error: 'reorder.hclust' is not an exported object from 'namespace:vegan' While this S3 method is well available. For example if I type help(reorder.hclust, package = "vegan") I obtain the intended help page and vegan:::reorder.hclust displays the source code of the function on the console... Also the NAMESPACE file of my vegan installation contains S3method(reorder, hclust) . I would like to use this function in another package were I

问题 Why do I have this error message : > vegan::reorder.hclust Error: 'reorder.hclust' is not an exported object from 'namespace:vegan' While this S3 method is well available. For example if I type help(reorder.hclust, package = "vegan") I obtain the intended help page and vegan:::reorder.hclust displays the source code of the function on the console... Also the NAMESPACE file of my vegan installation contains S3method(reorder, hclust) . I would like to use this function in another package were I