AttributeError: 'str' object has no attribute 'zorder'

[nstoeckigt]

Bug report

I try to create a plot from temperatures over datetimes by using an numpy.array. The plot should only be saved as PNG to be display via a servers webserver.

The data is retrieved from a logfile that looks like:

10.09.2017 08:43:01 - 32°C
10.09.2017 10:04:01 - 33°C
10.09.2017 12:32:01 - 31°C

Code for reproduction

The Code is highly inspired by → https://matplotlib.org/gallery/api/date.html#sphx-glr-gallery-api-date-py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import matplotlib 
matplotlib.use('Agg')
import matplotlib.pyplot as plt
import matplotlib.dates as mdates
import datetime   
import numpy as np
import re
import os


def getDataFromLog():
    hddData = np.empty((0,), dtype=[('dates', 'datetime64[s]'), ('temperature', 'int64')])

    with open('/var/log/hddtemp.log', 'r') as f:
        for line in f:
            (hd, ht) = line.strip().split(' - ')

            hd = datetime.datetime.strptime(hd, '%d.%m.%Y %H:%M:%S')
            ht = int(re.findall(r'\d+', ht)[0].strip())

            hddEntry = np.array([(hd, ht)], dtype=hddData.dtype)
            hddData = np.hstack((hddData, hddEntry))

    # plt.ioff()

    years = mdates.YearLocator()   # every year
    months = mdates.MonthLocator()  # every month
    days = mdates.DayLocator()  # every day
    dayFmt = mdates.DateFormatter('%d.%m.%Y')
    monthFmt = mdates.DateFormatter('%b.%Y')
    yearFmt = mdates.DateFormatter('%Y')

    Date = hddData['dates'].astype('O')

    Fig = plt.figure()
    Ax = plt.subplot()
    Ax.plot(Date)

    Ax.xaxis.set_major_locator(months)
    Ax.xaxis.set_major_formatter(monthFmt)
    Ax.xaxis.set_minor_locator(days)

    minDate = Date.min()
    maxDate = Date.max()

    datemin = datetime.date(minDate.year, minDate.month, 1)
    datemax = datetime.date(maxDate.year, maxDate.month + 1, 1)
    Ax.set_xlim(datemin, datemax)

    # format the coords message box
    def temperature(x):
        return '$%d' % x
    Ax.format_xdata = mdates.DateFormatter('%d.%m.%Y %H:%M')
    Ax.format_ydata = temperature

    #Ax.ylabel('temperature')
    Ax.title = "HDD Temperature"
    Ax.grid(True) 

    Fig.autofmt_xdate()
    plt.show()
    #plt.savefig('hddtemp.png')
    Fig.savefig('hddtemp.png')
    plt.close(Fig)


def main():
    getDataFromLog()

if __name__ == "__main__":
    main()

Actual outcome

Traceback (most recent call last):
  File "./draw_hddtemp.py", line 75, in <module>
    main()
  File "./draw_hddtemp.py", line 72, in main
    getDataFromLog()
  File "./draw_hddtemp.py", line 67, in getDataFromLog
    Fig.savefig('hddtemp_f.png')
  File "/usr/lib/python2.7/dist-packages/matplotlib/figure.py", line 1572, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/matplotlib/backend_bases.py", line 2244, in print_figure
    **kwargs)
  File "/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_agg.py", line 545, in print_png
    FigureCanvasAgg.draw(self)
  File "/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_agg.py", line 464, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/python2.7/dist-packages/matplotlib/artist.py", line 63, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/matplotlib/figure.py", line 1143, in draw
    renderer, self, dsu, self.suppressComposite)
  File "/usr/lib/python2.7/dist-packages/matplotlib/image.py", line 139, in _draw_list_compositing_images
    a.draw(renderer)
  File "/usr/lib/python2.7/dist-packages/matplotlib/artist.py", line 63, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/matplotlib/axes/_base.py", line 2381, in draw
    dsu = [(a.zorder, a) for a in artists]
AttributeError: 'str' object has no attribute 'zorder'

Expected outcome

A PNG file containing the plot corresponding to the temperatures from the log.

Matplotlib version

• Operating system: Debian GNU/Linux 9.2 (stretch)
• Matplotlib version: 2.0.0+dfsg1-2
• Matplotlib backend (print(matplotlib.get_backend())): u'TkAgg'
• Python version: 2.7.13
• Jupyter version (if applicable): ---
• Other libraries: numpy:1.12.1

apt install python-matplotlib python-matplotlib-data

[WeatherGod]

`Ax.title = "HDD Temperature"` Don't do that. Use `Ax.set_title("HDD Temperature")`

…

On Wed, Oct 18, 2017 at 12:22 PM, Nico Stöckigt ***@***.***> wrote: Bug report I try to create a plot from temperatures over datetimes by using an numpy.array. The plot should only be saved as PNG to be display via a servers webserver. The data is retrieved from a logfile that looks like: 10.09.2017 08:43:01 - 32°C 10.09.2017 10:04:01 - 33°C 10.09.2017 12:32:01 - 31°C *Code for reproduction* The Code is highly inspired by → https://matplotlib.org/ gallery/api/date.html#sphx-glr-gallery-api-date-py #!/usr/bin/env python# -*- coding: utf-8 -*-import matplotlib matplotlib.use('Agg')import matplotlib.pyplot as pltimport matplotlib.dates as mdatesimport datetime import numpy as npimport reimport os def getDataFromLog(): hddDates = [] hddTemps = [] hddData = np.empty((0,), dtype=[('dates', 'datetime64[s]'), ('temperature', 'int64')]) with open('/var/log/hddtemp.log', 'r') as f: for line in f: (hd, ht) = line.strip().split(' - ') hd = datetime.datetime.strptime(hd, '%d.%m.%Y %H:%M:%S') ht = int(re.findall(r'\d+', ht)[0].strip()) hddEntry = np.array([(hd, ht)], dtype=hddData.dtype) hddData = np.hstack((hddData, hddEntry)) # plt.ioff() years = mdates.YearLocator() # every year months = mdates.MonthLocator() # every month days = mdates.DayLocator() # every day dayFmt = mdates.DateFormatter('%d.%m.%Y') monthFmt = mdates.DateFormatter('%b.%Y') yearFmt = mdates.DateFormatter('%Y') Date = hddData['dates'].astype('O') Fig = plt.figure() Ax = plt.subplot() Ax.plot(Date) Ax.xaxis.set_major_locator(months) Ax.xaxis.set_major_formatter(monthFmt) Ax.xaxis.set_minor_locator(days) minDate = Date.min() maxDate = Date.max() datemin = datetime.date(minDate.year, minDate.month, 1) datemax = datetime.date(maxDate.year, maxDate.month + 1, 1) Ax.set_xlim(datemin, datemax) # format the coords message box def temperature(x): return '$%d' % x Ax.format_xdata = mdates.DateFormatter('%d.%m.%Y %H:%M') Ax.format_ydata = temperature #Ax.ylabel('temperature') Ax.title = "HDD Temperature" Ax.grid(True) Fig.autofmt_xdate() plt.show() #plt.savefig('hddtemp.png') Fig.savefig('hddtemp.png') plt.close(Fig) def main(): getDataFromLog() if __name__ == "__main__": main() *Actual outcome* Traceback (most recent call last): File "./draw_hddtemp.py", line 75, in <module> main() File "./draw_hddtemp.py", line 72, in main getDataFromLog() File "./draw_hddtemp.py", line 67, in getDataFromLog Fig.savefig('hddtemp_f.png') File "/usr/lib/python2.7/dist-packages/matplotlib/figure.py", line 1572, in savefig self.canvas.print_figure(*args, **kwargs) File "/usr/lib/python2.7/dist-packages/matplotlib/backend_bases.py", line 2244, in print_figure **kwargs) File "/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_agg.py", line 545, in print_png FigureCanvasAgg.draw(self) File "/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_agg.py", line 464, in draw self.figure.draw(self.renderer) File "/usr/lib/python2.7/dist-packages/matplotlib/artist.py", line 63, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/matplotlib/figure.py", line 1143, in draw renderer, self, dsu, self.suppressComposite) File "/usr/lib/python2.7/dist-packages/matplotlib/image.py", line 139, in _draw_list_compositing_images a.draw(renderer) File "/usr/lib/python2.7/dist-packages/matplotlib/artist.py", line 63, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/matplotlib/axes/_base.py", line 2381, in draw dsu = [(a.zorder, a) for a in artists] AttributeError: 'str' object has no attribute 'zorder' *Expected outcome* A PNG file containing the plot corresponding to the temperatures from the log. *Matplotlib version* - Operating system: Debian GNU/Linux 9.2 (stretch) - Matplotlib version: 2.0.0+dfsg1-2 - Matplotlib backend (print(matplotlib.get_backend())): u'TkAgg' - Python version: 2.7.13 - Jupyter version (if applicable): --- - Other libraries: numpy:1.12.1 apt install python-matplotlib python-matplotlib-data — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#9471>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AARy-JoBk-2mRad5C9flU9KDl2E5zAM_ks5stiWpgaJpZM4P9-9O> .

[WeatherGod]

Also, I should note that this code will break in December because you are adding 1 to the month. Use timedelta instead for doing date math.

[jklymak]

...also please try and minimize your example before writing an issue. You can often find the error that way.