def __init__(self, key, item):
if key is None:
self.key = self._default_hashkey
elif not callable(key):
self.key = getter(key)
else:
self.key = key
self.item = item
def rowfunc(t):
""" Rowfunc provides a function that can be mapped onto a sequence.
>>> accounts = symbol('accounts', 'var * {name: string, amount: int}')
>>> f = rowfunc(accounts['amount'])
>>> row = ('Alice', 100)
>>> f(row)
100
See Also:
compute<Rowwise, Sequence>
"""
from toolz.itertoolz import getter
indices = [t._child.fields.index(col) for col in t.fields]
return getter(indices)
def rowfunc(t):
""" Rowfunc provides a function that can be mapped onto a sequence.
>>> accounts = symbol('accounts', 'var * {name: string, amount: int}')
>>> f = rowfunc(accounts['amount'])
>>> row = ('Alice', 100)
>>> f(row)
100
See Also:
compute<Rowwise, Sequence>
"""
from toolz.itertoolz import getter
indices = [t._child.fields.index(col) for col in t.fields]
return getter(indices)
def test_getter():
assert getter(0)('Alice') == 'A'
assert getter([0])('Alice') == ('A',)
assert getter([])('Alice') == ()
def test_getter():
assert getter(0)('Alice') == 'A'
assert getter([0])('Alice') == ('A', )
assert getter([])('Alice') == ()
def quick_scan(cls):
"""
Return a very quick list of block devices from
a number of sources so we can quickly see changes.
"""
return pipe(fetch_device_list(), cmapcat(getter("paths")), sorted)