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Merge pull request #2868 from takluyver/import-performance...
Merge pull request #2868 from takluyver/import-performance Import performance Defer various imports for a small reduction in startup time. IPython.lib.__init__ previously loaded IPython.lib.inputhook to export some of its functions. This meant that importing anything from IPython.lib also loaded inputhook. For now, I've just removed that import, but that is an API change, because the functions are no longer accessible as e.g. IPython.lib.enable_qt4 Added a note about the API change. Timing command, borrowed from Openoffice to simulate cold start: $ sync ; echo 3 | sudo tee /proc/sys/vm/drop_caches; time ipython3 -c pass Results with this branch: 7.68, 7.64, 7.35, 7.38 s 'real' Results with master: 8.17, 8.04, 7.81, 7.77

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test_application.py
50 lines | 1.6 KiB | text/x-python | PythonLexer
# coding: utf-8
"""Tests for IPython.core.application"""
import os
import tempfile
from IPython.core.application import BaseIPythonApplication
from IPython.testing import decorators as dec
from IPython.utils import py3compat
@dec.onlyif_unicode_paths
def test_unicode_cwd():
"""Check that IPython starts with non-ascii characters in the path."""
wd = tempfile.mkdtemp(suffix=u"€")
old_wd = os.getcwdu()
os.chdir(wd)
#raise Exception(repr(os.getcwdu()))
try:
app = BaseIPythonApplication()
# The lines below are copied from Application.initialize()
app.init_profile_dir()
app.init_config_files()
app.load_config_file(suppress_errors=False)
finally:
os.chdir(old_wd)
@dec.onlyif_unicode_paths
def test_unicode_ipdir():
"""Check that IPython starts with non-ascii characters in the IP dir."""
ipdir = tempfile.mkdtemp(suffix=u"€")
# Create the config file, so it tries to load it.
with open(os.path.join(ipdir, 'ipython_config.py'), "w") as f:
pass
old_ipdir1 = os.environ.pop("IPYTHONDIR", None)
old_ipdir2 = os.environ.pop("IPYTHON_DIR", None)
os.environ["IPYTHONDIR"] = py3compat.unicode_to_str(ipdir, "utf-8")
try:
app = BaseIPythonApplication()
# The lines below are copied from Application.initialize()
app.init_profile_dir()
app.init_config_files()
app.load_config_file(suppress_errors=False)
finally:
if old_ipdir1:
os.environ["IPYTHONDIR"] = old_ipdir1
if old_ipdir2:
os.environ["IPYTHONDIR"] = old_ipdir2