Source code for coalib.bears.requirements.PipRequirement
from coalib.bears.requirements.PackageRequirement import PackageRequirement
from coalib.misc.Shell import call_without_output
import sys
[docs]class PipRequirement(PackageRequirement):
"""
This class is a subclass of ``PackageRequirement``. It specifies the proper
type for ``python`` packages automatically and provide a function to check
for the requirement.
"""
def __init__(self, package, version=''):
"""
Constructs a new ``PipRequirement``, using the ``PackageRequirement``
constructor.
>>> pr = PipRequirement('setuptools', '19.2')
>>> pr.type
'pip'
>>> pr.package
'setuptools'
>>> pr.version
'19.2'
:param package: A string with the name of the package to be installed.
:param version: A version string. Leave empty to specify latest version.
"""
PackageRequirement.__init__(self, 'pip', package, version)
[docs] def is_installed(self):
"""
Checks if the dependency is installed.
:param return: True if dependency is installed, false otherwise.
"""
return not call_without_output((sys.executable, '-m', 'pip',
'show', self.package))