IOError on Python 2.7 / No such directory __pycache__/

Bắt đầu trong snappy_cffi.py, quanh lệnh gọi verify của cffi, sau đó so sánh nó với API cffi được tham chiếu trong issue và traceback của verifier.py. Tái hiện trường hợp cài đặt Python 2.7 không dùng quyền root; hoàn thành khi việc import snappy không còn thất bại nếu pycache chưa tồn tại.

I try to use snappy which use cffi with a non-root user that can't create the pycache/ dir.
I got :

STDERR: Traceback (most recent call last):
      File "/opt/graphite/pypy/bin/django-admin", line 11, in <module>
        sys.exit(execute_from_command_line())
      File "/opt/graphite/pypy/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
        utility.execute()
      File "/opt/graphite/pypy/site-packages/django/core/management/__init__.py", line 302, in execute
        settings.INSTALLED_APPS
      File "/opt/graphite/pypy/site-packages/django/conf/__init__.py", line 55, in __getattr__
        self._setup(name)
      File "/opt/graphite/pypy/site-packages/django/conf/__init__.py", line 43, in _setup
        self._wrapped = Settings(settings_module)
      File "/opt/graphite/pypy/site-packages/django/conf/__init__.py", line 99, in __init__
        mod = importlib.import_module(self.SETTINGS_MODULE)
      File "/opt/pypy/pypy-5.7.1-linux_x86_64-portable/lib-python/2.7/importlib/__init__.py", line 37, in import_module
        __import__(name)
      File "/opt/graphite/webapp/graphite/settings.py", line 160, in <module>
        from graphite.local_settings import *  # noqa
      File "/opt/graphite/webapp/graphite/local_settings.py", line 53, in <module>
        from graphite.local_settings_dynamic import *
      File "/opt/graphite/webapp/graphite/local_settings_dynamic.py", line 1, in <module>
        from biggraphite.plugins import graphite
      File "/opt/graphite/pypy/site-packages/biggraphite/plugins/graphite.py", line 30, in <module>
        from biggraphite import graphite_utils
      File "/opt/graphite/pypy/site-packages/biggraphite/graphite_utils.py", line 17, in <module>
        from biggraphite import utils as bg_utils
      File "/opt/graphite/pypy/site-packages/biggraphite/utils.py", line 22, in <module>
        from biggraphite.drivers import cassandra as bg_cassandra
      File "/opt/graphite/pypy/site-packages/biggraphite/drivers/cassandra.py", line 34, in <module>
        from cassandra import cluster as c_cluster
      File "/opt/graphite/pypy/site-packages/cassandra/cluster.py", line 46, in <module>
        from cassandra.connection import (ConnectionException, ConnectionShutdown,
      File "/opt/graphite/pypy/site-packages/cassandra/connection.py", line 80, in <module>
        import snappy
      File "/opt/graphite/pypy/site-packages/snappy.py", line 50, in <module>
        from snappy_cffi import UncompressError, compress, decompress, \
      File "/opt/graphite/pypy/site-packages/snappy_cffi.py", line 169, in <module>
        ''', libraries=["snappy"])
      File "/opt/pypy/pypy-5.7.1-linux_x86_64-portable/lib_pypy/cffi/api.py", line 438, in verify
        lib = self.verifier.load_library()
      File "/opt/pypy/pypy-5.7.1-linux_x86_64-portable/lib_pypy/cffi/verifier.py", line 113, in load_library
        self._write_source()
      File "/opt/pypy/pypy-5.7.1-linux_x86_64-portable/lib_pypy/cffi/verifier.py", line 202, in _write_source
        with open(self.sourcefilename, "w") as fp:
    IOError: [Errno 2] No such file or directory: '/opt/graphite/pypy/site-packages/__pycache__/_cffi__g762f05ffx6bf5342b.c'

As far as I understand, it calls a deprecated method of cffi (http://cffi.readthedocs.io/en/latest/whatsnew.html?#v1-0-0).
A workaround would be to create pycache/ directory at the installation as root.