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DOC: Better error when float on datetime axis by jklymak · Pull Request #10084 · matplotlib/matplotlib · GitHub

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DOC: Better error when float on datetime axis #10084

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Merged
dstansby merged 1 commit into from
Dec 28, 2017
Conversation 11 Commits 1 Checks 0 Files changed
Merged

DOC: Better error when float on datetime axis #10084

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4 changes: 4 additions & 0 deletions lib/matplotlib/axis.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,8 @@

import six

import logging

from matplotlib import rcParams
import matplotlib.artist as artist
from matplotlib.artist import allow_rasterization
Expand All @@ -22,6 +24,8 @@
import numpy as np
import warnings

_log = logging.getLogger(__name__)

GRIDLINE_INTERPOLATION_STEPS = 180


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24 changes: 20 additions & 4 deletions lib/matplotlib/dates.py
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Expand Up @@ -120,7 +120,6 @@

import six
from six.moves import zip
from matplotlib import rcParams
import re
import time
import math
Expand All @@ -129,20 +128,22 @@

import warnings


from dateutil.rrule import (rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY,
MONTHLY, WEEKLY, DAILY, HOURLY, MINUTELY,
SECONDLY)
from dateutil.relativedelta import relativedelta
import dateutil.parser
import logging
import numpy as np


import matplotlib
from matplotlib import rcParams
import matplotlib.units as units
import matplotlib.cbook as cbook
import matplotlib.ticker as ticker

_log = logging.getLogger(__name__)

__all__ = ('date2num', 'num2date', 'num2timedelta', 'drange', 'epoch2num',
'num2epoch', 'mx2num', 'DateFormatter',
Expand Down Expand Up @@ -282,6 +283,11 @@ def _from_ordinalf(x, tz=None):
tz = _get_rc_timezone()

ix = int(x)
if ix < 1:
raise ValueError('cannot convert {} to a date. This '
'often happens if non-datetime values are passed to '
'an axis that expects datetime objects. '
.format(ix))
dt = datetime.datetime.fromordinal(ix).replace(tzinfo=UTC)

remainder = float(x) - ix
Expand Down Expand Up @@ -941,7 +947,12 @@ def datalim_to_dt(self):
dmin, dmax = self.axis.get_data_interval()
if dmin > dmax:
dmin, dmax = dmax, dmin

if dmin < 1:
raise ValueError('datalim minimum {} is less than 1 and '
'is an invalid Matplotlib date value. This often '
'happens if you pass a non-datetime '
'value to an axis that has datetime units'
.format(dmin))
return num2date(dmin, self.tz), num2date(dmax, self.tz)

def viewlim_to_dt(self):
Expand All @@ -951,7 +962,12 @@ def viewlim_to_dt(self):
vmin, vmax = self.axis.get_view_interval()
if vmin > vmax:
vmin, vmax = vmax, vmin

if vmin < 1:
raise ValueError('view limit minimum {} is less than 1 and '
'is an invalid Matplotlib date value. This '
'often happens if you pass a non-datetime '
'value to an axis that has datetime units'
.format(vmin))
return num2date(vmin, self.tz), num2date(vmax, self.tz)

def _get_unit(self):
Expand Down
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