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Adding the ability to control length to __format__ #54

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Adding the ability to control length to __format__ #54

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83 changes: 78 additions & 5 deletions 10-seq-hacking/vector_v5.py
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Original file line number Diff line number Diff line change
Expand Up @@ -187,6 +187,65 @@
'<4.000e+00, 1.047e+00, 9.553e-01, 7.854e-01>'
>>> format(Vector([0, 1, 0, 0]), '0.5fh')
'<1.00000, 1.57080, 0.00000, 0.00000>'

Tests of new ``format()`` with length limit::

>>> v5 = Vector(range(5))
>>> v100 = Vector(range(100))
>>> format(v5)
'(0.0, 1.0, 2.0, 3.0, 4.0)'
>>> format(v5, 'h') # doctest:+ELLIPSIS
'<5.477..., 1.5707..., 1.387..., 1.190..., 0.927...>'
>>> format(v5, '0.3fh')
'<5.477, 1.571, 1.387, 1.190, 0.927>'
>>> format(v5, '*')
'(0.0, 1.0, 2.0, 3.0, 4.0)'
>>> format(v5, '.3f*')
'(0.000, 1.000, 2.000, 3.000, 4.000)'
>>> format(v5, '.3fh*')
'<5.477, 1.571, 1.387, 1.190, 0.927>'

>>> v30 = Vector(range(30))
>>> format(v30) # doctest:+ELLIPSIS
'(0.0, 1.0, ..., 29.0)'
>>> format(v30, 'h') # doctest:+ELLIPSIS
'<92.493..., 1.570..., ..., 0.802...>'
>>> format(v30, '0.3fh') # doctest:+ELLIPSIS
'<92.493, 1.571, ..., 0.803>'
>>> format(v30, '*') # doctest:+ELLIPSIS
'(0.0, 1.0, ..., 29.0)'
>>> format(v30, '.3f*') # doctest:+ELLIPSIS
'(0.000, 1.000, ..., 29.000)'
>>> format(v30, '.3fh*') # doctest:+ELLIPSIS
'<92.493, 1.571, ..., 0.803>'

>>> v100 = Vector(range(100))
>>> format(v100) # doctest:+ELLIPSIS
'(0.0, 1.0, ..., 29.0, ...)'
>>> format(v100, 'h') # doctest:+ELLIPSIS
'<573.018..., 1.570..., ..., 1.521..., ...>'
>>> format(v100, '0.3fh') # doctest:+ELLIPSIS
'<573.018, 1.571, ..., 1.521, ...>'
>>> format(v100, '*') # doctest:+ELLIPSIS
'(0.0, 1.0, ..., 99.0)'
>>> format(v100, '.3f*') # doctest:+ELLIPSIS
'(0.000, 1.000, ..., 99.000)'
>>> format(v100, '.3fh*') # doctest:+ELLIPSIS
'<573.018, 1.571, ..., 0.790>'

>>> v100.maxlen = 3
>>> format(v100)
'(0.0, 1.0, 2.0, ...)'
>>> format(v100, 'h') # doctest:+ELLIPSIS
'<573.018..., 1.570..., 1.569..., ...>'
>>> format(v100, '0.3fh')
'<573.018, 1.571, 1.569, ...>'
>>> format(v100, '*') # doctest:+ELLIPSIS
'(0.0, 1.0, ..., 99.0)'
>>> format(v100, '.3f*') # doctest:+ELLIPSIS
'(0.000, 1.000, ..., 99.000)'
>>> format(v100, '.3fh*') # doctest:+ELLIPSIS
'<573.018, 1.571, ..., 0.790>'
"""

from array import array
Expand Down Expand Up @@ -228,10 +287,10 @@ def __hash__(self):
return functools.reduce(operator.xor, hashes, 0)

def __abs__(self):
return math.sqrt(sum(x * x for x in self))
return math.hypot(*self)

def __bool__(self):
return bool(abs(self))
return any(x != 0 for x in self)

def __len__(self):
return len(self._components)
Expand Down Expand Up @@ -268,16 +327,30 @@ def angle(self, n): # <2>
def angles(self): # <3>
return (self.angle(n) for n in range(1, len(self)))

maxlen = 30
def __format__(self, fmt_spec=''):
print_all = len(self) <= self.maxlen # whether print all numbers
if fmt_spec.endswith('*'):
fmt_spec = fmt_spec[:-1]
print_all = True
if fmt_spec.endswith('h'): # hyperspherical coordinates
fmt_spec = fmt_spec[:-1]
coords = itertools.chain([abs(self)],
self.angles()) # <4>
if print_all:
coords = itertools.chain([abs(self)],
self.angles()) # <4>
else:
coords = itertools.chain([abs(self)],
itertools.islice(self.angles(), self.maxlen -1))
outer_fmt = '<{}>' # <5>
else:
coords = self
if print_all:
coords = self
else:
coords = itertools.islice(self, self.maxlen)
outer_fmt = '({})' # <6>
components = (format(c, fmt_spec) for c in coords) # <7>
if not print_all:
components = itertools.chain(components, ['...'])
return outer_fmt.format(', '.join(components)) # <8>

@classmethod
Expand Down