запустить скрипт Python, используя предпочтительный вариант Python (run a python script using a preferred python variant)
Имя (Name)
pcp-python - run a python script using a preferred python variant
Синопсис (Synopsis)
pcp python [SCRIPT [ARG] ...]
Описание (Description)
pcp-python has been replaced by pmpython(1) which is preferred,
however pcp-python is still installed to provided backwards
compatibility.
pcp-python provides a way to run python scripts using a
customisable python binary, rather than embedding any particular
version of python into each script.
This can be useful as it allows version-independent python code
to be run anywhere. All python modules shipped with PCP support
versions 2.6 and later (in the python2 series), and 3.3 and later
(in the python3 release series).
Due to python monitoring and collecting scripts being relatively
simple in PCP (not requiring new modules, language features,
etc), it has been possible to ensure they work for all of the
above python versions. Thus, it is common for PCP python scripts
to use a "shebang" line that invokes pcp-python as follows:
#!/usr/bin/pcp python
This allows the custom setting to be injected instead of a hard-
coded python version, while still allowing the user to override
the python version as follows:
$ PCP_PYTHON_PROG=python3 /usr/bin/pcp python --version
Python 3.3.2
$ PCP_PYTHON_PROG=python2 /usr/bin/pcp python --version
Python 2.7.5
This is convenient for shipping identical scripts on multiple
platforms, and for testing different python versions with the one
script (e.g. in the case where multiple versions of python are
installed, PCP_PYTHON_PROG can be set in the local environment to
override the global setting).
By default, the value of PCP_PYTHON_PROG from /etc/pcp.conf will
be used. The default value of this configuration parameter is
set depending on some heuristics about the target build platform.
These heuristics favour the use of python3 in all recent releases
of PCP, for those platforms that support it.
Окружение PCP (PCP environment)
Environment variables with the prefix PCP_ are used to
parameterize the file and directory names used by PCP. On each
installation, the file /etc/pcp.conf contains the local values
for these variables. The $PCP_CONF variable may be used to
specify an alternative configuration file, as described in
pcp.conf(5).
Смотри также (See also)
PCPIntro(1) and pcp(1).
