Current File : //opt/alt/python37/lib/python3.7/site-packages/alembic/util/pyfiles.py
import sys
import os
import re
from .compat import load_module_py, load_module_pyc
from mako.template import Template
def template_to_file(template_file, dest, output_encoding, **kw):
with open(dest, 'wb') as f:
template = Template(filename=template_file)
f.write(
template.render_unicode(**kw).encode(output_encoding)
)
def coerce_resource_to_filename(fname):
"""Interpret a filename as either a filesystem location or as a package
resource.
Names that are non absolute paths and contain a colon
are interpreted as resources and coerced to a file location.
"""
if not os.path.isabs(fname) and ":" in fname:
import pkg_resources
fname = pkg_resources.resource_filename(*fname.split(':'))
return fname
def simple_pyc_file_from_path(path):
"""Given a python source path, return the so-called
"sourceless" .pyc or .pyo path.
This just a .pyc or .pyo file where the .py file would be.
Even with PEP-3147, which normally puts .pyc/.pyo files in __pycache__,
this use case remains supported as a so-called "sourceless module import".
"""
if sys.flags.optimize:
return path + "o" # e.g. .pyo
else:
return path + "c" # e.g. .pyc
def pyc_file_from_path(path):
"""Given a python source path, locate the .pyc.
See http://www.python.org/dev/peps/pep-3147/
#detecting-pep-3147-availability
http://www.python.org/dev/peps/pep-3147/#file-extension-checks
"""
import imp
has3147 = hasattr(imp, 'get_tag')
if has3147:
return imp.cache_from_source(path)
else:
return simple_pyc_file_from_path(path)
def edit(path):
"""Given a source path, run the EDITOR for it"""
import editor
from . import CommandError
try:
editor.edit(path)
except Exception as exc:
raise CommandError('Error executing editor (%s)' % (exc,))
def load_python_file(dir_, filename):
"""Load a file from the given path as a Python module."""
module_id = re.sub(r'\W', "_", filename)
path = os.path.join(dir_, filename)
_, ext = os.path.splitext(filename)
if ext == ".py":
if os.path.exists(path):
module = load_module_py(module_id, path)
elif os.path.exists(simple_pyc_file_from_path(path)):
# look for sourceless load
module = load_module_pyc(
module_id, simple_pyc_file_from_path(path))
else:
raise ImportError("Can't find Python file %s" % path)
elif ext in (".pyc", ".pyo"):
module = load_module_pyc(module_id, path)
del sys.modules[module_id]
return module
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