How do I make my variable have a default value “0” when no input has been provided by the user in python?
Here is my code. I want my variable "a" to hold a default value 0 whenever the user has not given any particular value. I have given my code below:
from tkinter import *
from tkinter import messagebox
def sample():
a= show_values1()
v= int(a)+10
print (v)
def show_values1(event=None):
global a
a= i1.get()
print(a)
if int(a) > ul or int(a) < ll :
print('Limit Exceed')
messagebox.showerror("Error", "Please enter values from -100 to 100")
else :
return a
root= Tk()
ul= 100
ll=-100
i1 = inputBox = Entry()
i1.place(x=70, y=48, height=20)
bu1=Button(text='Enter', command = show_values1)
bu1.place(x = 70, y = 28, width=40, height=20)
bu2=Button(text='SEND', command = sample)
bu2.bind('<Return>', lambda x: show_values1(event=None))
bu2.place(x = 70, y = 98, width=40, height=20)
root.mainloop()
python tkinter
asked Nov 25 '18 at 16:16
Vishvachi SinhaVishvachi Sinha
2217
add a comment |
Here is my code. I want my variable "a" to hold a default value 0 whenever the user has not given any particular value. I have given my code below:
from tkinter import *
from tkinter import messagebox
def sample():
a= show_values1()
v= int(a)+10
print (v)
def show_values1(event=None):
global a
a= i1.get()
print(a)
if int(a) > ul or int(a) < ll :
print('Limit Exceed')
messagebox.showerror("Error", "Please enter values from -100 to 100")
else :
return a
root= Tk()
ul= 100
ll=-100
i1 = inputBox = Entry()
i1.place(x=70, y=48, height=20)
bu1=Button(text='Enter', command = show_values1)
bu1.place(x = 70, y = 28, width=40, height=20)
bu2=Button(text='SEND', command = sample)
bu2.bind('<Return>', lambda x: show_values1(event=None))
bu2.place(x = 70, y = 98, width=40, height=20)
root.mainloop()
python tkinter
asked Nov 25 '18 at 16:16
Vishvachi SinhaVishvachi Sinha
2217
if not i1.get(): a = "0"
– Filip Młynarski
Nov 25 '18 at 16:19
2
You seem to be familiar withif/elsestatements - what's holding you back?
– timgeb
Nov 25 '18 at 16:21
add a comment |
Here is my code. I want my variable "a" to hold a default value 0 whenever the user has not given any particular value. I have given my code below:
from tkinter import *
from tkinter import messagebox
def sample():
a= show_values1()
v= int(a)+10
print (v)
def show_values1(event=None):
global a
a= i1.get()
print(a)
if int(a) > ul or int(a) < ll :
print('Limit Exceed')
messagebox.showerror("Error", "Please enter values from -100 to 100")
else :
return a
root= Tk()
ul= 100
ll=-100
i1 = inputBox = Entry()
i1.place(x=70, y=48, height=20)
bu1=Button(text='Enter', command = show_values1)
bu1.place(x = 70, y = 28, width=40, height=20)
bu2=Button(text='SEND', command = sample)
bu2.bind('<Return>', lambda x: show_values1(event=None))
bu2.place(x = 70, y = 98, width=40, height=20)
root.mainloop()
python tkinter
asked Nov 25 '18 at 16:16
Vishvachi SinhaVishvachi Sinha
2217
Here is my code. I want my variable "a" to hold a default value 0 whenever the user has not given any particular value. I have given my code below:
from tkinter import *
from tkinter import messagebox
def sample():
a= show_values1()
v= int(a)+10
print (v)
def show_values1(event=None):
global a
a= i1.get()
print(a)
if int(a) > ul or int(a) < ll :
print('Limit Exceed')
messagebox.showerror("Error", "Please enter values from -100 to 100")
else :
return a
root= Tk()
ul= 100
ll=-100
i1 = inputBox = Entry()
i1.place(x=70, y=48, height=20)
bu1=Button(text='Enter', command = show_values1)
bu1.place(x = 70, y = 28, width=40, height=20)
bu2=Button(text='SEND', command = sample)
bu2.bind('<Return>', lambda x: show_values1(event=None))
bu2.place(x = 70, y = 98, width=40, height=20)
root.mainloop()
python tkinter
python tkinter
asked Nov 25 '18 at 16:16
Vishvachi SinhaVishvachi Sinha
2217
asked Nov 25 '18 at 16:16
Vishvachi SinhaVishvachi Sinha
2217
asked Nov 25 '18 at 16:16
Vishvachi SinhaVishvachi Sinha
2217
asked Nov 25 '18 at 16:16
Vishvachi SinhaVishvachi Sinha
2217
asked Nov 25 '18 at 16:16
Vishvachi SinhaVishvachi Sinha
2217
2217
if not i1.get(): a = "0"
– Filip Młynarski
Nov 25 '18 at 16:19
2
You seem to be familiar withif/elsestatements - what's holding you back?
– timgeb
Nov 25 '18 at 16:21
add a comment |
if not i1.get(): a = "0"
– Filip Młynarski
Nov 25 '18 at 16:19
2
You seem to be familiar withif/elsestatements - what's holding you back?
– timgeb
Nov 25 '18 at 16:21
if not i1.get(): a = "0"– Filip Młynarski
Nov 25 '18 at 16:19
if not i1.get(): a = "0"– Filip Młynarski
Nov 25 '18 at 16:19
2
2
You seem to be familiar with
if/else statements - what's holding you back?– timgeb
Nov 25 '18 at 16:21
You seem to be familiar with
if/else statements - what's holding you back?– timgeb
Nov 25 '18 at 16:21
add a comment |
2 Answers
2
active
oldest
votes
As li.get() returns a string. Nothing entered will be a string of zero length. You can test for that and then set a to zero. For axample, after your a = i1.get() statement, insert:
if len(a) == 0:
a = "0"
Maybe you also need to handle cases where get() returns values that are not able to be cast to type int. :-)
answered Nov 25 '18 at 16:48
SteveSteve
16319
Thankyou, it works ! :D
– Vishvachi Sinha
Nov 25 '18 at 20:36
add a comment |
If no value has been entered, i1.get() will have a value of empty string "", so you could just test for that inside showvalues1:
if a == "":
return 0
answered Nov 25 '18 at 16:27
R. DavidsonR. Davidson
1708
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
As li.get() returns a string. Nothing entered will be a string of zero length. You can test for that and then set a to zero. For axample, after your a = i1.get() statement, insert:
if len(a) == 0:
a = "0"
Maybe you also need to handle cases where get() returns values that are not able to be cast to type int. :-)
answered Nov 25 '18 at 16:48
SteveSteve
16319
Thankyou, it works ! :D
– Vishvachi Sinha
Nov 25 '18 at 20:36
add a comment |
As li.get() returns a string. Nothing entered will be a string of zero length. You can test for that and then set a to zero. For axample, after your a = i1.get() statement, insert:
if len(a) == 0:
a = "0"
Maybe you also need to handle cases where get() returns values that are not able to be cast to type int. :-)
answered Nov 25 '18 at 16:48
SteveSteve
16319
Thankyou, it works ! :D
– Vishvachi Sinha
Nov 25 '18 at 20:36
add a comment |
As li.get() returns a string. Nothing entered will be a string of zero length. You can test for that and then set a to zero. For axample, after your a = i1.get() statement, insert:
if len(a) == 0:
a = "0"
Maybe you also need to handle cases where get() returns values that are not able to be cast to type int. :-)
answered Nov 25 '18 at 16:48
SteveSteve
16319
As li.get() returns a string. Nothing entered will be a string of zero length. You can test for that and then set a to zero. For axample, after your a = i1.get() statement, insert:
if len(a) == 0:
a = "0"
Maybe you also need to handle cases where get() returns values that are not able to be cast to type int. :-)
answered Nov 25 '18 at 16:48
SteveSteve
16319
answered Nov 25 '18 at 16:48
SteveSteve
16319
answered Nov 25 '18 at 16:48
SteveSteve
16319
answered Nov 25 '18 at 16:48
SteveSteve
16319
16319
Thankyou, it works ! :D
– Vishvachi Sinha
Nov 25 '18 at 20:36
add a comment |
Thankyou, it works ! :D
– Vishvachi Sinha
Nov 25 '18 at 20:36
Thankyou, it works ! :D
– Vishvachi Sinha
Nov 25 '18 at 20:36
Thankyou, it works ! :D
– Vishvachi Sinha
Nov 25 '18 at 20:36
add a comment |
If no value has been entered, i1.get() will have a value of empty string "", so you could just test for that inside showvalues1:
if a == "":
return 0
answered Nov 25 '18 at 16:27
R. DavidsonR. Davidson
1708
add a comment |
If no value has been entered, i1.get() will have a value of empty string "", so you could just test for that inside showvalues1:
if a == "":
return 0
answered Nov 25 '18 at 16:27
R. DavidsonR. Davidson
1708
add a comment |
If no value has been entered, i1.get() will have a value of empty string "", so you could just test for that inside showvalues1:
if a == "":
return 0
answered Nov 25 '18 at 16:27
R. DavidsonR. Davidson
1708
If no value has been entered, i1.get() will have a value of empty string "", so you could just test for that inside showvalues1:
if a == "":
return 0
answered Nov 25 '18 at 16:27
R. DavidsonR. Davidson
1708
answered Nov 25 '18 at 16:27
R. DavidsonR. Davidson
1708
answered Nov 25 '18 at 16:27
R. DavidsonR. Davidson
1708
answered Nov 25 '18 at 16:27
R. DavidsonR. Davidson
1708
1708
add a comment |
add a comment |
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if not i1.get(): a = "0"– Filip Młynarski
Nov 25 '18 at 16:19
2
You seem to be familiar with
if/elsestatements - what's holding you back?– timgeb
Nov 25 '18 at 16:21