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- ensureImport(importName, venvDir, packageName=None, stdout=None, stderr=None)
- ensureImport - Try to import a module, and upon failure to import try to install package into provided virtualenv
@param importName <str> - The name of the module to import
@param venvDir <str/VirtualEnvInfo> - The path to a virtualenv, likely created by createEnv or the global env (fetched via getGlobalVirtualEnvInfo()).
@param packageName <str/None> - If the package name differs from the import name (like biopython package provides "Bio" module), install this package if import fails. This may contain version info (like AdvancedHTMLParser>6.0)
@param stdout <stream/None> - Stream to use for stdout as package info, or None to silence. Default None. NOTE: This differs from elsewhere where sys.stdout is default.
@param stderr <stream/None> - Stream to use for stderr as package info, or None to silence. Default None. NOTE: This differs from elsewhere where sys.stderr is default.
@return - The imported module
@raises - ImportError if cannot import.
NOTE: With this method, PipInstallFailed will be intercepted and ImportError thrown instead, as this is intended to be a drop-in replacement for "import" when the package name differs.
- generateRequirementsTxt(packages)
- generateRequirementsTxt - Generates a requirements.txt suitable for pip to ingest based on packages param.
@param packages - Describes the required packages. Takes one of the following forms:
String - Directly becomes contents of requirements.txt file to be ingested by pip
List - A list/tuple/set of package names (optionally including version requirements, e.x. MyPkg==1.2.3)
Dict - A dictionary of package names to versions. If no value is present, the latest will be fetched.
@return <str> - generated requirements.txt file contents
- installPackages(packages, venvDir, stdout=<_io.TextIOWrapper name='<stdout>' mode='w' encoding='UTF-8'>, stderr=<_io.TextIOWrapper name='<stderr>' mode='w' encoding='UTF-8'>)
- installPackages - Installs packages into a created virtual environment
@param packages - Describes the required packages. Takes one of the following forms:
String - Directly becomes contents of requirements.txt file to be ingested by pip
List - A list/tuple/set of package names (optionally including version requirements, e.x. MyPkg==1.2.3)
Dict - A dictionary of package names to versions. If no value is present, the latest will be fetched.
@param venvDir <str/VirtualEnvInfo> - Path to a created virtualenv directory. This should be the 'virtualenvDirectory' key from the return of createEnv, or just the VirtualEnvInfo object itself will work.
@param stdout <iostream/None> - Stream to be used as stdout for installation. Default is sys.stdout. Use "None" to swallow output.
@param stderr <iostream/None> - Stream to be used as stderr for installation. Default is sys.stderr. Use "None" to swallow output.
@return - The generated requirements.txt used to install packages.
@raises -
VirtualEnvOnDemand.exceptions.PipInstallFailed - if cannot install packages
VirtualEnvOnDemand.exceptions.VirtualEnvDoesNotExist - If given venvDir does not exist
Others (Exception, etc) - If permissions problem to write to specified directory, etc
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