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Commit03c6e91

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Merge pull request#240 from legopitstop/main
[Snippets] Added tkinter snippet
2 parents8202e68 +ead93c6 commit03c6e91

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---
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title:Display a Pillow Image
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description:Use Pillow to show an image in a Tkinter window.
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author:Legopitstop
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tags:app,hello-world,object-oriented
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---
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```py
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from tkinterimport Tk, Label
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fromPILimport Image, ImageDraw, ImageTk
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classApp(Tk):
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def__init__(self):
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Tk.__init__(self)
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self.geometry("200x200")
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# PhotoImage must be global or be assigned to a class or it will be garbage collected.
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self.photo= ImageTk.PhotoImage(self.make_image())
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lbl= Label(self,image=self.photo)
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lbl.pack(expand=1)
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defmake_image(self):
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width, height=200,200
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image= Image.new("RGB", (width, height),"white")
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# Create a drawing context
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draw= ImageDraw.Draw(image)
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# Draw a circle
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radius=80
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center= (width//2, height//2)
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draw.ellipse(
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[
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(center[0]- radius, center[1]- radius),
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(center[0]+ radius, center[1]+ radius),
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],
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fill="red",
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outline="black",
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width=3,
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)
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return image
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# Usage:
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root= App()
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root.mainloop()
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```
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---
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title:Hello, World!
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description:Creates a basic Tkinter window with a "Hello, World!" label.
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author:Legopitstop
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tags:app,hello-world,object-oriented
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---
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```py
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from tkinterimport Tk, Label
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classApp(Tk):
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def__init__(self):
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Tk.__init__(self)
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self.geometry("200x200")
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self.lbl= Label(self,text='Hello, World!')
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self.lbl.pack(expand=1)
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# Usage:
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root= App()
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root.mainloop()
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```
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---
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title:Allow Alphanumeric
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description:A validation function to allow alphanumeric characters.
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author:Legopitstop
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tags:validation,alphanumeric
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---
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```py
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from tkinterimport Tk, Entry
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defallow_alphanumeric(value):
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return value.isalnum()or value==""
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# Usage:
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root= Tk()
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root.geometry("200x200")
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reg= root.register(allow_alphanumeric)
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Entry(root,validate="key",validatecommand=(reg,"%P")).pack()
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root.mainloop()
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```
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---
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title:Allow Decimal
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description:A validation function to allow only decimal numbers.
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author:Legopitstop
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tags:validation,decimals
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---
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```py
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from tkinterimport Tk, Entry
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defallow_decimal(action,value):
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if action=="1":
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if value=="":
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returnTrue
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try:
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float(value)
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returnTrue
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exceptValueError:
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returnFalse
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returnTrue
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# Usage:
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root= Tk()
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root.geometry("200x200")
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reg= root.register(allow_decimal)
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Entry(root,validate="key",validatecommand=(reg,"%d","%P")).pack()
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root.mainloop()
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```
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---
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title:Allow Digits with A Max Length
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description:A validation function to allow only digits with a specified maximum length.
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author:Legopitstop
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tags:validation,max,length
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---
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```py
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from tkinterimport Tk, Entry
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defallow_digits_with_max_length(action,value,max_length):
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if action=="1":
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return value==""or (value.isdigit()andlen(value)<=int(max_length))
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returnTrue
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# Usage:
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root= Tk()
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root.geometry("200x200")
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reg= root.register(allow_digits_with_max_length)
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# 4 is the max length
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Entry(root,validate="key",validatecommand=(reg,"%d","%P",4)).pack()
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root.mainloop()
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```
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---
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title:Allow Lowercase
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description:A validation function to allow only lowercase alphabetic characters.
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author:Legopitstop
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tags:validation,lowercase
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---
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```py
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from tkinterimport Tk, Entry
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defallow_lowercase(value):
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return value.islower()or value==""
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# Usage:
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root= Tk()
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root.geometry("200x200")
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reg= root.register(allow_lowercase)
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Entry(root,validate="key",validatecommand=(reg,"%P")).pack()
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root.mainloop()
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```
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---
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title:Allow Negative Integers
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description:A validation function to allow only negative integers.
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author:Legopitstop
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tags:validation,negative,integers
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---
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```py
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from tkinterimport Tk, Entry
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defallow_negative_integers(value):
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return (
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valuein ("","-")or value.startswith("-")and value[1:].isdigit()
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if value
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elseTrue
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)
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# Usage:
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root= Tk()
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root.geometry("200x200")
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reg= root.register(allow_negative_integers)
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Entry(root,validate="key",validatecommand=(reg,"%P")).pack()
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root.mainloop()
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```
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---
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title:Allow Numbers in Range
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description:A validation function to allow only numbers within a specified range.
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author:Legopitstop
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tags:validation,number,range
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---
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```py
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from tkinterimport Tk, Entry
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defallow_numbers_in_range(action,value,min_value,max_value):
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if action=="1":
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try:
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num=float(value)
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returnfloat(min_value)<= num<=float(max_value)
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exceptValueError:
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returnFalse
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returnTrue
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# Usage:
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root= Tk()
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root.geometry("200x200")
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reg= root.register(allow_numbers_in_range)
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# 0 is the minimum value
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# 10 is the maximum value
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Entry(root,validate="key",validatecommand=(reg,"%d","%P",0,10)).pack()
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root.mainloop()
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```
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---
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title:Allow Only Alphabets
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description:A validation function to allow only alphabetic characters.
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author:Legopitstop
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tags:validation,alphabets
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---
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```py
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from tkinterimport Tk, Entry
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defallow_only_alphabets(value):
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return value.isalpha()or value==""
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# Usage:
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root= Tk()
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root.geometry("200x200")
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reg= root.register(allow_only_alphabets)
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Entry(root,validate="key",validatecommand=(reg,"%P")).pack()
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root.mainloop()
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```
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---
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title:Allow Only Digits
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description:A validation function to allow only digits.
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author:Legopitstop
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tags:validation,digits
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---
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```py
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from tkinterimport Tk, Entry
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defallow_only_digits(value):
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return value.isdigit()or value==""
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# Usage:
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root= Tk()
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root.geometry("200x200")
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reg= root.register(allow_only_digits)
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Entry(root,validate="key",validatecommand=(reg,"%P")).pack()
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root.mainloop()
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```

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