Bug appears when writing file from tkinter module - python-3.x

Question

import tkinter as tk
class Application(tk.Frame):
def __init__(self, master=None):
super().__init__(master)
self.pack()
self.create_widgets()
def create_widgets(self):
self.hi_there = tk.Button(self)
self.hi_there["text"] = "Done!\n(click me)"
self.hi_there["command"] = self.say_hi
self.hi_there.pack(side="top")
self.entrythingy = tk.Entry()
self.entrythingy2 = tk.Entry()
self.entrythingy.pack()
self.entrythingy2.pack()
# here is the application variable
self.contents = tk.StringVar()
self.contents2 = tk.StringVar()
# set it to some value
self.contents.set("stdio")
self.contents2.set("script name")
# tell the entry widget to watch this variable
self.entrythingy["textvariable"] = self.contents
self.entrythingy2["textvariable"] = self.contents2
self.text = tk.Text()
self.text.pack()
# and here we get a callback when the user hits return.
# we will have the program print out the value of the
# application variable when the user hits return
self.entrythingy.bind('<Key-Return>',
self.print_contents)
self.quit = tk.Button(self, text="QUIT", fg="red",
command=root.destroy)
self.quit.pack(side="bottom")
def say_hi(self):
#print("hi there, everyone!")
self.fn = self.contents2.get()
self.body = self.text.get(1.0, tk.END).split('\n')
#print('Self.body:\n',self.body)
self.libs = self.contents.get().split(' ')
self.make_c()
def make_c(self):
lib_text = ''
for i in self.libs:
lib_text += "#include <lib.h>\n".replace('lib', i)
body_text = "int main() {\n\t"+"\n\t".join(self.body)+"return 0\n}"
print(lib_text+body_text)
with open(self.fn+'.c', 'w+') as f:
f.write(lib_text+body_text)
print('File written!')
from subprocess import call
call(['gcc',self.fn+'.c', '-o', self.fn])
def print_contents(self, event):
print("hi. contents of entry is now ---->",
self.contents.get())
#self.contents.set("")
#def
root = tk.Tk()
app = Application(master=root)
app.mainloop()
Those are the my code, which tries to make a c file and convert it. The problem is, when I convert it once, it is working fine, but when I change the content of the text box, the file doesn't change, and I don't understand why. I am sure that I put in the new file content, because it prints before it writes. Also, it appears that when I try to write files independent from tkinter, it works just the way I want it to.
I think there is some mechanism that I am not aware of in TK, or there is a bug. Please help me out, thanks.

Answer 1

I solved it. It doesn't compile again due to the error in it when I added return 0, without semicolon. So, when I click the executable file, it shows the old program. I added the semicolon, and now it is fine. Thx everyone!