raw input through tkinter entry widget

Question

from tkinter import *
import matplotlib.pyplot as plt
window = Tk()

entryBox = Entry(window,text='input latex command')
entryBox.grid(row=0,column=0)

s = '$\sum {n} = \frac{n(n+1)}{2}$'
plt.text(.5,.5, s, fontsize=40)
plt.show()

This snippet displays only a part of the expression as follows:

instead of the expected result:

(This is achieved by changing the 7th line as: plt.text(.3,.3, r'$\sum {n} = \frac{n(n+1)}{2}$', fontsize=40)).

My understanding is that in the first case we are not passing the string as a raw string. How can I get the plot to render correctly when I have the string as a string variable but cannot input it as a string literal?

If you write `s = r'$\sum {n} = \frac{n(n+1)}{2}$'` (i.e. add the `r` in front of the string), it works as expected. — Thomas Kühn, Feb 14 '18 at 07:15
See also [this](https://stackoverflow.com/q/7262828/2454357). — Thomas Kühn, Feb 14 '18 at 07:17
I meant I could not pass the string as a literal because the string is coming through the entry widget. @Nae — Mutasim Mim, Feb 14 '18 at 14:10

score 0 · Answer 1 · answered Feb 14 '18 at 16:35

0

Filter your string using:

s = s.replace("\x0c", "\\f")

as this doesn't work on frac formfeed apparently.

answered Feb 14 '18 at 16:35

Nae

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raw input through tkinter entry widget

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