matplotlib questions

[Steve]

I would like to know how the data is placed on the Y-axis and at the tops of
the bars.
The data is not being shown properly.  With some exceptions, it looks as if
the data is getting sorted independently from the dates.


OK, here is the code:
==============================================
# https://matplotlib.org/stable/gallery/index.html
import matplotlib.pyplot as plt
import numpy as np

width = 12 #Width of the graph
height = 6  #Height of the graph

plt.rcParams["figure.figsize"] = (width,height)
plt.rcParams["font.size"] = (9.0)


Count = 0
datesList = []   # Each date showing end of bottle use
hoursList = []   # Number of hours 
# daysList = []  # Number of days calculated from hours/24
countList = []   # simple tally

with open("__Insulin_Tracker.txt", 'r') as infile:
        for lineEQN in infile:
          insulinHours = lineEQN[47:52].strip()
          print("Hours = " + insulinHours)
          hoursList.append(insulinHours)
          
          insulinDates = lineEQN[20:30].strip()
          datesList.append(insulinDates)
          
      #    insulinDays= lineEQN[57:62].strip()
      #    daysList.append(insulinDays)
          
          Count += 1
          countList.append(str(Count))
         # print("    " + str(Count) + "  " + insulinDates + " Hours: " +
insulinHours)
x = Count
count = str(Count)

# Each date indicated the date on which a bottle of insulin has been
depleted
# The bar is to show the number of hours that the bottle has been in use.

Labels = datesList
Xdata= hoursList

Title = ("Bottle List       Number of entries: " + count)
x = np.arange(len(Labels))  # the label locations

width = 0.35  # the width of the bars
margin = 0

fig, ax = plt.subplots()
fig.tight_layout(pad=10) # Sets the size of the graph

rects1 = ax.bar(x - width/2, Xdata, width, label='Hours') #Populates the x
axis

# Add some text for labels, title and custom x-axis tick labels, etc.
# fontsize = 20

ax.set_ylabel('Hours of use for each bottle')
ax.set_title(Title) 
ax.set_xticks(x)
ax.set_xticklabels((datesList), rotation = 90) #Dates at bottom of the graph
ax.legend()
ax.bar_label(rects1, padding=0,rotation = 90)

plt.show()

===================================
Here is my data in __Insulin_Tracker.txt (with indents)
===================================

                    Sat Jan 02, 2021 15         29       1.21
                    Thu Jan 07, 2021 01        116       4.83
                    Tue Jan 12, 2021 01        120       5.00
                    Fri Jan 15, 2021 23         74       3.08
                    Tue Jan 19, 2021 22         95       3.96
                    Fri Jan 22, 2021 21         71       2.96
                    Tue Jan 26, 2021 08        103       4.29
                    Sun Jan 31, 2021 23        115       4.79
                    Fri Feb 05, 2021 01        118       4.92
                    Mon Feb 08, 2021 20         71       2.96
                    Thu Feb 11, 2021 18         80       3.33
                    Tue Feb 16, 2021 08        120       5.00
                    Fri Feb 19, 2021 18         72       3.00
                    Wed Feb 24, 2021 01        113       4.71
                    Sun Feb 28, 2021 22         97       4.04
                    Thu Mar 04, 2021 11         95       3.96
                    Mon Mar 08, 2021 18        103       4.29
                    Sat Mar 13, 2021 15        117       4.88
                    Wed Mar 17, 2021 10         91       3.79
                    Sun Mar 21, 2021 00         96       4.00
                    Fri Mar 26, 2021 00        120       5.00
                    Tue Mar 30, 2021 17        103       4.29
                    Sat Apr 03, 2021 00         89       3.71
                    Wed Apr 07, 2021 23         99       4.12
                    Sun Apr 11, 2021 05         98       4.08
                    Thu Apr 15, 2021 14         95       3.96
                    Sun Apr 18, 2021 23         71       2.96
                    Fri Apr 23, 2021 23        120       5.00
                    Tue Apr 27, 2021 17        100       4.17
                    Tue Jul 27, 2021 21       2178      90.75
                    Sun Aug 01, 2021 18        127       5.29
                    Thu Aug 05, 2021 23         91       3.79
                    Tue Aug 10, 2021 17        124       5.17
                    Sat Aug 14, 2021 21         90       3.75
                    Thu Aug 19, 2021 09        128       5.33
                    Wed Aug 25, 2021 02        137       5.71






-----Original Message-----
From: Python-list <python-list-bounces+gronicus=sga.ninja at python.org> On
Behalf Of David Lowry-Duda
Sent: Friday, August 27, 2021 3:25 PM
To: python-list at python.org
Subject: Re: matplotlib questions

> I am trying to modify the "Bar Graph Demo" at 
> https://matplotlib.org/stable/gallery/index.html,  Lines, bars, and 
> markers but the more I experiment and change the code, the more messed 
> up it becomes.

It is much easier to give constructive suggestions if you give a minimum
runnable code sample that indicates what you're trying and what you're
trying to do. See also http://catb.org/~esr/faqs/smart-questions.html

I'll also note that I see nothing called "bar graph demo" on the gallery
page.

- DLD
--
https://mail.python.org/mailman/listinfo/python-list