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Add parameter checks to DayLocator initiator #6955

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Merged
tacaswell merged 4 commits into from
Aug 22, 2016
Merged

Add parameter checks to DayLocator initiator #6955

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7f8c295
Add parameter checks to DayLocator initiator
Aug 18, 2016
b5c9aa4
Consolidate DayLocator interval checks
Aug 21, 2016
a2a8dc2
Add tests for dates.DayLocator
Aug 22, 2016
160c55d
PEP8 fixes
Aug 22, 2016
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15 changes: 2 additions & 13 deletions lib/matplotlib/dates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -821,19 +821,6 @@ def tick_values(self, vmin, vmax):

self.rule.set(dtstart=start, until=stop)

# estimate the number of ticks very approximately so we don't
# have to do a very expensive (and potentially near infinite)
# 'between' calculation, only to find out it will fail.
nmax, nmin = date2num((vmax, vmin))
estimate = (nmax - nmin) / (self._get_unit() * self._get_interval())
# This estimate is only an estimate, so be really conservative
# about bailing...
if estimate > self.MAXTICKS * 2:
raise RuntimeError(
'RRuleLocator estimated to generate %d ticks from %s to %s: '
'exceeds Locator.MAXTICKS * 2 (%d) ' % (estimate, vmin, vmax,
self.MAXTICKS * 2))

dates = self.rule.between(vmin, vmax, True)
if len(dates) == 0:
return date2num([vmin, vmax])
Expand Down Expand Up @@ -1254,6 +1241,8 @@ def __init__(self, bymonthday=None, interval=1, tz=None):

Default is to tick every day of the month: ``bymonthday=range(1,32)``
"""
if not interval == int(interval) or interval < 1:
raise ValueError("interval must be an integer greater than 0")
if bymonthday is None:
bymonthday = range(1, 32)
elif isinstance(bymonthday, np.ndarray):
Expand Down
8 changes: 8 additions & 0 deletions lib/matplotlib/tests/test_dates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -457,6 +457,14 @@ def tz_convert(*args):
_test_date2num_dst(pd.date_range, tz_convert)


def test_DayLocator():
assert_raises(ValueError, mdates.DayLocator, interval=-1)
assert_raises(ValueError, mdates.DayLocator, interval=-1.5)
assert_raises(ValueError, mdates.DayLocator, interval=0)
assert_raises(ValueError, mdates.DayLocator, interval=1.3)
mdates.DayLocator(interval=1.0)


if __name__ == '__main__':
import nose
nose.runmodule(argv=['-s', '--with-doctest'], exit=False)
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