CODEWITHSUNDEEP
pythontkinter
Concerned_Citizen
Concerned_Citizen

Reputation: 31

Python and Tkinter: Function madness


I'm trying to write myself a program that calculates a function taken from a Tk.Entry().
The problem is, when I try to run my display() function
(it runs Tkinter, sets up the window, and calls root.Mainloop()),
I get parse errors coming from eval() from a function that is supposed to be called only if the user inputs all of the variables and presses a button (the button's command).
The function uses eval(variable), while variable is entry.get().
What am I doing wrong here?

def cfunc(_n,_f,_t0,_tn,):  
 xbase=[]  
 tbase=[]  
 t=0      
 n2=eval(_n)  #Stuff happens here, cfunc gets entry_n.get() as arguments.  
 f2=_f  #Also, tabs are correct in the original.  
 tmin2=eval(_t0)  
 tmax2=eval(_tn)  
 tr=tmax2-tmin2  
 sk = tr / n2  
 i2=tmin2

Also, error:

File "Q:\Py\counter.py", line 89, in
cfunc n2=eval(_n) File "", line 0
^ SyntaxError: unexpected EOF while parsing

Upvotes: 1

Views: 409

Answers (1)

Bryan Oakley
Bryan Oakley

Reputation: 385980

You haven't shown us the code that causes the error (the value of _n) so we can only guess. A couple words of advice:

  1. the error message is telling you the problem: unexpected eof. That means there's a missing closing quote or brace or something like that. The parser got to the end of the "file" (the string being eval'd) before it got the characters it expected.

  2. put a print statement immediately before an eval, and use some special characters to delimit it (eg: puts ">>>$_n<<<") so you can tell precisely what is in the string being eval'd, including any leading or trailing spaces.

Upvotes: 1

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