def find_compatible_interpreters(pex_python_path=None, compatibility_constraints=None):
"""Find all compatible interpreters on the system within the supplied constraints and use
PEX_PYTHON_PATH if it is set. If not, fall back to interpreters on $PATH.
"""
if pex_python_path:
interpreters = []
for binary in pex_python_path.split(os.pathsep):
try:
interpreters.append(PythonInterpreter.from_binary(binary))
except Executor.ExecutionError:
print("Python interpreter %s in PEX_PYTHON_PATH failed to load properly." % binary,
file=sys.stderr)
if not interpreters:
die('PEX_PYTHON_PATH was defined, but no valid interpreters could be identified. Exiting.')
else:
# We may have been invoked with a specific interpreter not on the $PATH, make sure our
# sys.executable is included as a candidate in this case.
interpreters = OrderedSet([PythonInterpreter.get()])
# Add all qualifying interpreters found in $PATH.
interpreters.update(PythonInterpreter.all())
return list(
matched_interpreters(interpreters, compatibility_constraints)
if compatibility_constraints
else interpreters
)
def find_compatible_interpreters(pex_python_path, compatibility_constraints):
"""Find all compatible interpreters on the system within the supplied constraints and use
PEX_PYTHON_PATH if it is set. If not, fall back to interpreters on $PATH.
"""
if pex_python_path:
interpreters = []
for binary in pex_python_path.split(os.pathsep):
try:
interpreters.append(PythonInterpreter.from_binary(binary))
except Executor.ExecutionError:
print(
"Python interpreter %s in PEX_PYTHON_PATH failed to load properly."
% binary,
file=sys.stderr)
if not interpreters:
die('PEX_PYTHON_PATH was defined, but no valid interpreters could be identified. Exiting.'
)
else:
if not os.getenv('PATH', ''):
# no $PATH, use sys.executable
interpreters = [PythonInterpreter.get()]
else:
# get all qualifying interpreters found in $PATH
interpreters = PythonInterpreter.all()
return list(
matched_interpreters(interpreters, compatibility_constraints
) if compatibility_constraints else interpreters)
def _select_pex_python_interpreter(target_python, compatibility_constraints=None):
target = find_in_path(target_python)
if not target:
die('Failed to find interpreter specified by PEX_PYTHON: %s' % target)
if compatibility_constraints:
pi = PythonInterpreter.from_binary(target)
if not list(matched_interpreters([pi], compatibility_constraints)):
die('Interpreter specified by PEX_PYTHON (%s) is not compatible with specified '
'interpreter constraints: %s' % (target, str(compatibility_constraints)))
if not os.path.exists(target):
die('Target interpreter specified by PEX_PYTHON %s does not exist. Exiting.' % target)
return target
def _filter_compatible_interpreters(interpreters,
compatibility_constraints=None):
return list(
matched_interpreters(interpreters, compatibility_constraints
) if compatibility_constraints else interpreters)