CODEWITHSUNDEEP
pythonpandasmatplotlibtkinter
Kyrubas
Kyrubas

Reputation: 897

Using tkinter to plot pandas dataframes

So I'm trying to write a small GUI that will allow an end use to plot X vs Y of any 2 columns in an Excel file. Here's my code:

import pandas as pd
import matplotlib.pyplot as plt
import tkinter as tk

my_base=pd.read_excel('my_base.xlsx', 'the_tab', index_col=None, na_values = ['NA'])
my_base_header = list(my_base.columns.values)

my_base['Generated Date'] = pd.to_datetime(my_base['Generated Date'])

main_win = tk.Tk()

def plot_graph():
    print(option1.get())
    print(option2.get())
    my_base.plot(x = option1.get(), y = option2.get(), style = 'x')
    plt.show()

option1 = tk.StringVar(main_win)
option1.set(my_base_header[0])
option2 = tk.StringVar(main_win)
option2.set(my_base_header[0])

opt1 = tk.OptionMenu(main_win, option1, *my_base_header)
opt1.pack()
opt2 = tk.OptionMenu(main_win, option2, *my_base_header)
opt2.pack()

runbtn = tk.Button(main_win, text = 'Plot', command = plot_graph)
runbtn.pack()

main_win.mainloop()

I can get the program to plot if I put the dataframe headers in directly like so:

my_base.plot(x = 'Generated Date', y = 'How many', style = 'x')

But when I use for example x = option1.get() in there I get this traceback

Traceback (most recent call last):
  File "<pyshell#14>", line 1, in <module>
    my_base.plot(x= x_ax, y = y_ax, style = 'x')
  File "C:\Python34\lib\site-packages\pandas\tools\plotting.py", line 2485, in plot_frame
    **kwds)
  File "C:\Python34\lib\site-packages\pandas\tools\plotting.py", line 2325, in _plot
    plot_obj.generate()
  File "C:\Python34\lib\site-packages\pandas\tools\plotting.py", line 921, in generate
    self._compute_plot_data()
  File "C:\Python34\lib\site-packages\pandas\tools\plotting.py", line 997, in _compute_plot_data
    'plot'.format(numeric_data.__class__.__name__))
TypeError: Empty 'Series': no numeric data to plot

Upvotes: 0

Views: 2239

Answers (1)

wordsforthewise
wordsforthewise

Reputation: 15787

It's as the error says: the data you're trying to plot is non-numeric, so it's probably a string or from the looks of it, maybe a datetime. If you include the data and which column is giving you this error, we could point out the problem.

If it is a datetime, you may need to convert it to a pandas timestamp type, like:

pandas.DatetimeIndex([yourDatetime])

Your code seems to work for me. I used this demo dataset: http://www.contextures.com/xlSampleData01.html

If I try to plot something non-numeric, such as 'Region' or 'Rep', it gives me the same error you have (no numeric data to plot). If I plot 'Unit Cost' vs 'Total', or any other combination of 2 numeric datasets, it works.

import pandas as pd
import matplotlib.pyplot as plt
import Tkinter as tk

my_base=pd.read_excel('SampleData.xls', 'SalesOrders', index_col=None, na_values = ['NA'])
my_base_header = list(my_base.columns.values)

#print my_base
my_base['OrderDate'] = pd.to_datetime(my_base['OrderDate'])

main_win = tk.Tk()

def plot_graph():
    print(option1.get())
    print(option2.get())
    my_base.plot(x = option1.get(), y = option2.get(), style = 'x')
    plt.show()

option1 = tk.StringVar(main_win)
option1.set(my_base_header[0])
option2 = tk.StringVar(main_win)
option2.set(my_base_header[0])

opt1 = tk.OptionMenu(main_win, option1, *my_base_header)
opt1.pack()
opt2 = tk.OptionMenu(main_win, option2, *my_base_header)
opt2.pack()

runbtn = tk.Button(main_win, text = 'Plot', command = plot_graph)
runbtn.pack()

main_win.mainloop()

Upvotes: 1

Related Questions