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Only take the performance hit of banning PyQt4 imports on non frozen calibre installs

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This commit is contained in:
Kovid Goyal 2014-08-15 17:19:05 +05:30
parent b3b7918e5a
commit 8a758b9c82
1 changed files with 10 additions and 9 deletions
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19
src/calibre/startup.py
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@ -16,7 +16,7 @@ __builtin__.__dict__['_'] = lambda s: s
# immediately translated to the environment language # immediately translated to the environment language
__builtin__.__dict__['__'] = lambda s: s __builtin__.__dict__['__'] = lambda s: s
from calibre.constants import iswindows, preferred_encoding, plugins, isosx, islinux from calibre.constants import iswindows, preferred_encoding, plugins, isosx, islinux, isfrozen
_run_once = False _run_once = False
winutil = winutilerror = None winutil = winutilerror = None
@ -24,17 +24,18 @@ winutil = winutilerror = None
if not _run_once: if not _run_once:
_run_once = True _run_once = True
# Prevent PyQt4 from being loaded if not isfrozen:
class PyQt4Ban(object): # Prevent PyQt4 from being loaded
class PyQt4Ban(object):
def find_module(self, fullname, path=None): def find_module(self, fullname, path=None):
if fullname.startswith('PyQt4'): if fullname.startswith('PyQt4'):
return self return self
def load_module(self, fullname): def load_module(self, fullname):
raise ImportError('Importing PyQt4 is not allowed as calibre uses PyQt5') raise ImportError('Importing PyQt4 is not allowed as calibre uses PyQt5')
sys.meta_path.insert(0, PyQt4Ban()) sys.meta_path.insert(0, PyQt4Ban())
# #
# Platform specific modules # Platform specific modules