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how to make entry widget in python tkinter respond on pressing a key

So, I'm making this game on python, Tkinter, where when I click the button "get a word", the computer randomly gives me a 6-8 letter word, now after it gives a word, an entry widget comes. In that, I have to type words and letters that are there inside the word given to me by the computer, so the problem is that after I am done typing the word or letter that I see in the word I should press the "enter" key and the computer should get to know about it and see the text written in the entry widget and check if the thing I wrote is there in the word given, if it is there, it should tell True.
else it should say false
can someone help me with this
thankyou

Try something like this:
import tkinter as tk
def print_entry(event):
print(variable.get())
root = tk.Tk()
variable = tk.StringVar(master=root)
entry = tk.Entry(root, textvariable=variable)
entry.pack()
# <Return> is the "Enter" key on your keyboard
entry.bind("<Return>", print_entry)
root.mainloop()
It binds to "<Return>" and executes print_entry. In print_entry it just prints everything inside the <tkinter.Entry>

TypeError: object of type 'Text' has no len()

what is this error and how can i fix it?
def check_number():
if (len(txtNum1)!=11):
error_number = "the number that you entered is wrong"
msg = tk.Message(frame, text = error_number , fg="red")
msg.pack()
title = Label(frame, text="enter your number", fg="gray")
title.pack()
txtNum1 = Text (frame, height=1, width=30)
txtNum1.pack(side=tk.TOP)
button = tk.Button(frame,
text="chek",
fg="green",
command=check_number)
button.pack(side=tk.BOTTOM)
root.mainloop()
i just test __len__method but its not working well.

One of the issues in your code is use use of the if statement. You are asking if the Text Object has a length instead of checking the content of the text object. This can be corrected with the use of get(). If you use get() on a Text Box you will need to specify the indices. .get(1.0, "end"). The problem with doing it this way is you will be getting a length that is 1 character longer than what has been typed so the easy fix to this is to just use an entry field here.
With an Entry() field you can use get() without indices and it will get a copy of the text in that field. Keep in mind if you have a space before or after the text it will count that as well. If you want to compensate for this you can add strip() after get() to delete the white-space on either side.
For a little clean up you will want to change how you are creating your message. With your code if you press the button multiple times then the program will add a new message with each button press. This will cause the messages to stack. To avoid this lets create the message label first and then just update it with our function using the .config() method.
The next bit of clean up lets remove the variable assignments to widgets that do not need them. Your first label and the button do not need to be assigned to a variable in this case.
The last bit of clean up is making sure you are consistent with your widgets. Right now (based of your example code) you are importing tkinter twice. Once with from tkinter import * and once with import tkinter as tk. You do not need both and should stick with the 2nd import method only. Using import tkinter as tk will help prevent you from overriding build in methods on accident.
Take a look at my below code:
import tkinter as tk
root = tk.Tk()
def check_number():
msg.config(text = "")
if len(txtNum1.get().strip()) != 11:
error_number = "the number that you entered is wrong"
msg.config(text = error_number)
tk.Label(root, text="enter your number", fg="gray").pack()
txtNum1 = tk.Entry(root, width=30)
txtNum1.pack(side=tk.TOP)
tk.Button(root, text="chek", fg="green", command=check_number).pack(side=tk.BOTTOM)
msg = tk.Message(root, text = "" , fg="red")
msg.pack()
root.mainloop()

Getting strings in a entry widget and printing some response through a label

So i saw many videos and questions and stuff but i'm still stuck on how i can respond to strings in an entry widget.so far all the tuts and videos seem to show how to handle numbers and not string,To be more specific i want to make a Tkinter Gui box that has an entry widget and when i type 'hey',it should respond/answer "hey" in/through a label,now the answering part is the one i know,i just don't know how to manipulate strings and not numbers in entry widgets.
Thanks,sorry for being a noob

You can use a StringVar to get/set the string value of an Entry widget:
import tkinter as tk
master = tk.Tk()
val = tk.StringVar()
entry = tk.Entry(master, textvariable=val)
entry.pack()
val.set("some value")
the_string = val.get()
print(the_string)
# some value

send the output of print() to tkinter Text widget

I wrote a python 3.4.2 programme to get a user input from python IDLE, perform some processing on the input and display a few statements in the python IDLE using print().
Now I am in the process of converting this to use a GUI using tkinter. This is the simple tkinter code I wrote for the GUI.
from tkinter import *
root=Tk()
root.title("Post-fix solver")
root.geometry("500x500")
mainframe=Frame(root)
mainframe.grid(column=0, row=0)
inputval=StringVar()
inputentry=Entry(mainframe,textvariable=inputval).grid(column=1,row=1)
executebutton=Button(mainframe,text="Run",command=check_expression).grid(column=1,row=5)
outputtext=Text(mainframe).grid(column=1,row=5)
root.mainloop()
So far I was able to get the user input through the Entry widget named inputentry in the GUI and send it to a variable in the original code using inputval.get(). Then it performs the processing on the input and shows the outputs of print() statement in the python IDLE.
My question is how can I modify the programme to send all those print() statements to the Text widget named outputtext and display them in the GUI?
I would be glad if you could show me how to do this without using classes as I am a beginner in python

3 easy steps:
1) Get the content of your variable and put it to a variable that I'm gonna name varContent;
2) Clear your text widget, that is, if the name of your text widget is text, then run text.delete(0, END);
3) Insert the string you've got in your variable varContent into your text text widget, that is, do text.insert(END, varContent).
I would do my code like this:
from tkinter import *
def check_expression():
#Your code that checks the expression
varContent = inputentry.get() # get what's written in the inputentry entry widget
outputtext.delete('0', 'end-1c') # clear the outputtext text widget
outputtext.insert(varContent)
root = Tk()
root.title("Post-fix solver")
root.geometry("500x500")
mainframe = Frame(root)
mainframe.grid(column=0, row=0)
inputentry = Entry(mainframe)
inputentry.grid(column=1, row=1)
executebutton = Button(mainframe, text="Run", command=check_expression)
executebutton.grid(column=1, row=5)
outputtext = Text(mainframe)
outputtext.grid(column=1, row=5)
root.mainloop()

For Python 3.x
After creating the entry box with inputentry=Entry(mainframe).grid() you can get the typed entries with inputentry.get().
Do the following to put the typed entry in a variable and to print it in the text widget named outputtext:
entryvar=inputentry.get() # the variable entryvar contains the text widget content
outputtext.delete(1.0,tk.END) # clear the outputtext text widget. 1.0 and tk.END are neccessary. tk implies the tkinter module. If you just want to add text dont incude that line
outputtext.insert(tk.END,entryvar) # insert the entry widget contents in the text widget. tk.END is necessary.

If you're using Python 3.4+ to run the program too, you can use the contextlib.redirect_stdout to capture the print output for a duration of a few statements into a file, or even a string:
import io
from contextlib import redirect_stdout
...
file = io.StringIO()
with redirect_stdout(file):
# here be all the commands whose print output
# we want to capture.
output = file.getvalue()
# output is a `str` whose contents is everything that was
# printed within the above with block.
Otherwise a better though a bit more arduous way is to make a StringIO file and print to it, so you'd have
buffer = io.StringIO()
print("something", file=buffer)
print("something more", file=buffer)
output = buffer.getvalue()
text.insert(END, output)

how to capture text from Tkinter entry

I am new to Tkinter, I have the following code:
from Tkinter import *
root = Tk()
root.title("Email Sender")
Label(root, text="To").grid(row=0)
text = StringVar()
toText = Entry(root, textvariable=text)
s= text.get()
root.mainloop()
My goal is to create a label "To" and an entry, I am trying to capture whatever typed from keyboard in the entry. However, with the above code, I got empty when I print s.
So how could I capture the text typed into the entry?
Thanks.

You are capturing the text typed into the Entry—but you're only doing s = text.get() once, before the mainloop has even started, at which point the text typed into the Entry is whatever the initial value of the Entry was, which is the empty string.
What you need to do is add an event handler that runs at the appropriate time—maybe on the root's close event, or each time the Entry's text is edited, or whatever seems right to you—and does the s = text.get(). Then, you'll have whatever was in the Entry at the time that event was fired.