def test_lazy():
mlab = l.LazyImport('matplotlib.mlab')
# repr for mlab should be <module 'matplotlib.mlab' will be lazily loaded>
assert 'lazily loaded' in repr(mlab)
# accessing mlab's attribute will cause an import of mlab
npt.assert_equal(mlab.dist(1969, 2011), 42.0)
# now mlab should be of class LoadedLazyImport an repr(mlab) should be
# <module 'matplotlib.mlab' from # '.../matplotlib/mlab.pyc>
assert 'lazily loaded' not in repr(mlab)
def test_lazy():
mlab = l.LazyImport('matplotlib.mlab')
# repr for mlab should be <module 'matplotlib.mlab' will be lazily loaded>
assert 'lazily loaded' in repr(mlab)
# accessing mlab's attribute will cause an import of mlab
npt.assert_(
np.all(
mlab.detrend_mean(np.array([1, 2, 3])) == np.array([-1., 0., 1.])))
# now mlab should be of class LoadedLazyImport an repr(mlab) should be
# <module 'matplotlib.mlab' from # '.../matplotlib/mlab.pyc>
assert 'lazily loaded' not in repr(mlab)
def test_lazy_noreload():
"Reloading of lazy modules causes ImportError"
mod = l.LazyImport('sys')
# accessing module dictionary will trigger an import
len(mod.__dict__)
# do not use named tuple feature for Python 2.6 compatibility
major, minor = sys.version_info[:2]
if major == 2:
with pytest.raises(ImportError) as e_info:
reload(mod)
elif major == 3:
import imp
with pytest.raises(ImportError) as e_info:
imp.reload(mod)
def test_lazy_reload():
f = file('baz.py', 'w')
f.write("def foo(): return 42")
f.close()
b = l.LazyImport('baz')
assert b.foo()==42
f = file('baz.py', 'w')
f.write("def bar(): return 0x42")
f.flush()
os.fsync(f)
f.close()
import time
time.sleep(1)
os.utime('baz.py', None)
reload(b)
os.remove('baz.py')
assert b.bar()==0x42
def test_lazy_noreload():
"Reloading of lazy modules causes ImportError"
mod = l.LazyImport('sys')
# accessing module dictionary will trigger an import
len(mod.__dict__)
npt.assert_raises(ImportError, reload, mod)