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Merged
merged 1 commit into from
Jun 18, 2015
Merged

bytes2pdatenum #4153

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4 changes: 2 additions & 2 deletions examples/pylab_examples/load_converter.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
from __future__ import print_function
from matplotlib.dates import strpdate2num
from matplotlib.dates import bytespdate2num
#from matplotlib.mlab import load
import numpy as np
from pylab import figure, show
Expand All @@ -10,7 +10,7 @@

dates, closes = np.loadtxt(
datafile, delimiter=',',
converters={0: strpdate2num('%d-%b-%y')},
converters={0: bytespdate2num('%d-%b-%y')},
skiprows=1, usecols=(0, 2), unpack=True)

fig = figure()
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26 changes: 26 additions & 0 deletions lib/matplotlib/dates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -261,6 +261,32 @@ def __call__(self, s):
return date2num(datetime.datetime(*time.strptime(s, self.fmt)[:6]))


class bytespdate2num(strpdate2num):
"""
Use this class to parse date strings to matplotlib datenums when
you know the date format string of the date you are parsing. See
:file:`examples/load_demo.py`.
"""
def __init__(self, fmt, encoding='utf-8'):
"""
Args:
fmt: any valid strptime format is supported
encoding: encoding to use on byte input (default: 'utf-8')
"""
super(bytespdate2num, self).__init__(fmt)
self.encoding = encoding

def __call__(self, b):
"""
Args:
b: byte input to be converted
Returns:
A date2num float
"""
s = b.decode(self.encoding)
return super(bytespdate2num, self).__call__(s)


# a version of dateutil.parser.parse that can operate on nump0y arrays
_dateutil_parser_parse_np_vectorized = np.vectorize(dateutil.parser.parse)

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