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"""Tests for the Formatters.
"""
from math import pi
try:
import numpy
except:
numpy = None
import nose.tools as nt
from IPython.core.formatters import FormatterABC, PlainTextFormatter
from IPython.lib import pretty
class A(object):
def __repr__(self):
return 'A()'
class B(A):
def __repr__(self):
return 'B()'
class BadPretty(object):
_repr_pretty_ = None
class GoodPretty(object):
def _repr_pretty_(self, pp, cycle):
pp.text('foo')
def __repr__(self):
return 'GoodPretty()'
def foo_printer(obj, pp, cycle):
pp.text('foo')
def test_pretty():
f = PlainTextFormatter()
f.for_type(A, foo_printer)
nt.assert_equals(f(A()), 'foo')
nt.assert_equals(f(B()), 'foo')
nt.assert_equals(f(GoodPretty()), 'foo')
# Just don't raise an exception for the following:
f(BadPretty())
f.pprint = False
nt.assert_equals(f(A()), 'A()')
nt.assert_equals(f(B()), 'B()')
nt.assert_equals(f(GoodPretty()), 'GoodPretty()')
def test_deferred():
f = PlainTextFormatter()
def test_precision():
"""test various values for float_precision."""
f = PlainTextFormatter()
nt.assert_equals(f(pi), repr(pi))
f.float_precision = 0
if numpy:
po = numpy.get_printoptions()
nt.assert_equals(po['precision'], 0)
nt.assert_equals(f(pi), '3')
f.float_precision = 2
if numpy:
po = numpy.get_printoptions()
nt.assert_equals(po['precision'], 2)
nt.assert_equals(f(pi), '3.14')
f.float_precision = '%g'
if numpy:
po = numpy.get_printoptions()
nt.assert_equals(po['precision'], 2)
nt.assert_equals(f(pi), '3.14159')
f.float_precision = '%e'
nt.assert_equals(f(pi), '3.141593e+00')
f.float_precision = ''
if numpy:
po = numpy.get_printoptions()
nt.assert_equals(po['precision'], 8)
nt.assert_equals(f(pi), repr(pi))
def test_bad_precision():
"""test various invalid values for float_precision."""
f = PlainTextFormatter()
def set_fp(p):
f.float_precision=p
nt.assert_raises(ValueError, set_fp, '%')
nt.assert_raises(ValueError, set_fp, '%.3f%i')
nt.assert_raises(ValueError, set_fp, 'foo')
nt.assert_raises(ValueError, set_fp, -1)
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