[Tutor] Accessing an entry value input by the user
Alan Gauld
alan.gauld at yahoo.co.uk
Sat Feb 11 20:03:39 EST 2017
On 11/02/17 18:59, Pooja Bhalode wrote:
> Hi Alan,
>
> I had done what you suggested here, I also tried creating another file for
> that snipet of the code to see if that section works. The other file works,
> but I am not able to figure out why the original one doesn't work.
Too late at night for a detailed analysis but your code
should be restructured its ghetting very messy and hard
to see whats going on. More on that another time.
Meanwhile some immediate thoughts...
> from Tkinter import *
> import datetime
> import tkMessageBox
> from tkFileDialog import *
> from tkMessageBox import *
If you do this there's no point in importing tkmessagebox earlier.
> root = Tk()
> root.title("Design of Experiments with Parameter Estimation")
> root.geometry("1000x1000")
>
> statusvar = StringVar()
> statusvar = "Status Bar"
You create the stringvar but then throw it waay by overwriting it with a
string.
Maybe you meant to do:
statusvar = StringVar()
statusvar.set("Status Bar")
???
> var1 = IntVar()
> var2 = IntVar()
> var3 = IntVar()
> var4 = IntVar()
>
> varreac = IntVar()
> varint = IntVar()
> varpro = IntVar()
>
> varconc = IntVar()
> vartemp = IntVar()
> entrynumberspeciesvar = IntVar()
You can only use a stringvar with an Entry because
the Entry only holds text, not integers. You will
need to do the conversions yourself when you set/get
the values.
> def DesignPoint():
> print "Inside Design Point"
> rootdesign=Tk()
You are still creating multiple roots, that is
really bad practice and almost sure to create
problems later. Define the function as:
def DesignPoint(root):...
and call it as
DesignPoint(root)
> rootdesign.title("Design Point Suggestions")
> rootdesign.geometry("700x400")
> frame1 = Frame(rootdesign)
> frame1.grid(row=0, column=0)
>
If you want a second window you should be
using a Toplevel widget not Frame here.
> label1 = Label(frame1, text="1. Responses to include: ")
> label1.grid(row=0, column=0,sticky=W)
>
>
> Label(frame1, text = "Number of species:").grid(row=0, column = 1,
> sticky=W)
> entrynumberspecies = Entry(frame1, textvariable = entrynumberspeciesvar)
> entrynumberspecies.grid(row=0, column = 2, sticky=W)
>
> # print entrynumberspeciesvar.get()
> checkreac = Checkbutton(frame1, text = "Reactant species", variable =
> varreac)
> checkreac.grid(row = 1, column = 1, sticky = W)
> checkreac.select()
> Checkbutton(frame1, text = "Intermediate species", variable =
> varint).grid(row = 2, column = 1, sticky = W)
> Checkbutton(frame1, text = "Product species", variable =
> varpro).grid(row = 3, column = 1, sticky = W)
>
> def Default():
> print "Inside default"
>
> var1.set(0)
> var2.set(0)
> var3.set(0)
> var4.set(1)
This function really should be defined outside
the DesignPoint one. It will be much easier to maintain
if you separate them out.
> Checkbutton(frame1, text = "Vertices", variable=var1, onvalue=1,
> offvalue=0).grid(row=1, column = 2, sticky=W)
> Checkbutton(frame1, text = "Edges", variable=var2).grid(row=2, column =
> 2, sticky=W)
> Checkbutton(frame1, text = "Faces", variable=var3).grid(row=3, column =
> 2, sticky=W)
> check = Checkbutton(frame1, text = "Center", variable=var4)
>
> check.grid(row=4, column = 2, sticky=W)
> check.select()
>
> Label(frame1, text="2. Variables to be adjusted:").grid(row=5,
> column=0,sticky=W)
> Checkbutton(frame1, text = "Concentration", variable=varconc,
> onvalue=1, offvalue=0).grid(row=5, column = 1, sticky=W)
> Checkbutton(frame1, text = "Temperature", variable=vartemp).grid(row=6,
> column = 1, sticky=W)
>
> def InsertRange():
> print "Inside InsertRange"
> # entrynumberspeciesvar.set(2)
> print entrynumberspeciesvar.get()
> for i in range(entrynumberspeciesvar.get()):
> textvar = StringVar()
> print i
> textvar = "\t Conc"+str(i)
Again you have deleted your StringVar object by overwriting it.
You need to set the value with the set() method. OTOH you
never use the StringVar so maybe you just need to delete
that line.
> Label(frame1, text=textvar).grid(row=(9+i), column=0,sticky=W)
> conclowerentry = Entry(frame1)
> conclowerentry.grid(row= (9+i), column = 1, sticky = W)
> concupperentry = Entry(frame1)
> concupperentry.grid(row= (9+i), column = 2, sticky = W)
>
Same goes here. You should have very good reasons to define event
handlers inside the functions that build your UIs. It usually just makes
the code more complex with no benefit.
> Label(frame1, text="3. Range of formulation:").grid(row=7,
> column=0,sticky=W)
> Button(frame1, text = "Insert Range", command = InsertRange()).grid(row
> = 7, column = 3, sticky=W)
> Label(frame1, text="Lower Limit").grid(row=7, column=1,sticky=W)
> Label(frame1, text="Upper Limit").grid(row=7, column=2,sticky=W)
>
> Label(frame1, text="\t Temperature").grid(row=8, column=0,sticky=W)
> templowerentry = Entry(frame1, text="0.0")
> templowerentry.grid(row= 8, column = 1, sticky = W)
> tempupperentry = Entry(frame1)
> tempupperentry.grid(row= 8, column = 2, sticky = W)
>
> rootdesign.mainloop()
>
>
> ## Secondary menu bar:
> menusec = Frame(root, bg="white")
> butt1 = Button(menusec, text="Part One", command=DesignPoint)
> butt1.pack(side=LEFT, padx=1)
> menusec.pack(side=TOP, fill=X)
>
>
> ### --- Status bar ---- ####
> Status = Label(root, text = statusvar, bd=1, relief=SUNKEN, anchor=W)
> Status.pack(side=BOTTOM, fill=X)
>
> text = Text(root, width=1000, height = 400)
> text.pack(side=BOTTOM)
>
>
> root.mainloop()
>
> I have removed other parts of the code and included only the ones related
> to the entry box and the work that I need to do.
> I also tried doing it in another file as mentioned before. That works the
> exact way I want.
>
> Code:
> from Tkinter import *
>
> rootdesign=Tk()
> rootdesign.title("Design Point Suggestions")
> rootdesign.geometry("650x400")
> frame1 = Frame(rootdesign)
> frame1.grid(row=0, column=0)
> entrynumberspeciesvar = IntVar()
> ## Inserting Checkboxes:
> label1 = Label(frame1, text="1. Responses to include: ")
> label1.grid(row=0, column=0,sticky=W )
> Label(frame1, text = "Number of species:").grid(row=0, column = 1, sticky=W)
> entrynumberspecies = Entry(frame1, textvariable = entrynumberspeciesvar)
> entrynumberspecies.grid(row=0, column = 2, sticky=W)
>
> def Print():
> print entrynumberspeciesvar.get()
> for i in range(entrynumberspeciesvar.get()):
> print i
> textvar = "\t Conc"+str(i+1)
> Label(frame1, text=textvar).grid(row=(9+i), column=0,sticky=W)
> conclowerentry = Entry(frame1)
> conclowerentry.grid(row= (9+i), column = 1, sticky = W)
> concupperentry = Entry(frame1)
> concupperentry.grid(row= (9+i), column = 2, sticky = W)
>
> Button(frame1, text = "Click", command = Print).grid(row = 2, column = 2,
> sticky = W)
> Label(frame1, text="\t Temperature").grid(row=8, column=0,sticky=W)
> templowerentry = Entry(frame1, text="0.0")
> templowerentry.grid(row= 8, column = 1, sticky = W)
> tempupperentry = Entry(frame1)
> tempupperentry.grid(row= 8, column = 2, sticky = W)
> rootdesign.mainloop()
>
>
> Please let me know where I am going wrong. Thank you so much.
> Pooja
>
> On Sat, Feb 11, 2017 at 12:52 PM, Alan Gauld via Tutor <tutor at python.org>
> wrote:
>
>> On 11/02/17 15:28, Pooja Bhalode wrote:
>>
>>> I am trying to create a label and an entry widget. I am not able to
>>> understand as to how to access the value input by the user in the entry
>>> widget.
>>>
>>> Label(frame1, text = "Number of species:").grid(row=0, column = 1,
>> sticky=W)
>>> entrynumberspecies = Entry(frame1)
>>> entrynumberspecies.grid(row=0, column = 2, sticky=W)
>>>
>>> print entrynumberspecies.get()
>>
>> You just accessed it, via the get() method. Did that not work?
>>
>>> How can I make the entrynumberspecies store the value in once the user
>>> inputs it and then use that value for later part of my code?
>>
>> You can do it the way you did above using the get() method.
>>
>> But you can also do what you did for the checkboxes - use
>> a StringVar and attach it to the Entry widget textvariable
>> attribute. That way the variable will reflect whats in
>> the Entry automatically and if you update the variable
>> it will update the Entry. (Personally I prefer to use
>> get() in most cases but many use the StringVar technique.)
>> See the example at the bottom...
>>
>>> or print it for that matter.
>>
>> You can print it as you did above or you can store it in
>> a variable and then print it or you can print the StringVar:
>>
>> print myEntry.get()
>>
>> myVar = MyEntry.get()
>> print myVar
>>
>> entryVar = StringVar()
>> myEntry = Entry(.....textvariable=entryVar)
>> print entryVar.get()
>>
>> Here is a minimal example:
>>
>> ################
>> from Tkinter import *
>>
>> def show():
>> print "entry says: " + e.get()
>> print "Variable holds: " + v.get()
>>
>> top = Tk()
>> v = StringVar()
>> e = Entry(top,textvariable=v)
>> e.pack()
>> Button(top,text="Set foobar", command=lambda : v.set("foobar")).pack()
>> Button(top,text="Show me", command=show).pack()
>>
>> top.mainloop()
>> #################
>>
>>
>> --
>> Alan G
>> Author of the Learn to Program web site
>> http://www.alan-g.me.uk/
>> http://www.amazon.com/author/alan_gauld
>> Follow my photo-blog on Flickr at:
>> http://www.flickr.com/photos/alangauldphotos
>>
>>
>> _______________________________________________
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> _______________________________________________
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--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos
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