How to pass a value to an entry validatecommand - python-3.x

Question

I am validating a form in tkinter using validatecommand. There are two entries, one should only accept integers and the other floats.
Here is the basic code:
import tkinter as tk
class Form(tk.Tk):
def __init__(self):
tk.Tk.__init__(self)
validCmd1 = (self.register(self.val1), "%P")
validCmd2 = (self.register(self.val2), "%P")
self.lab1 = tk.Label(self, text = "Float:")
self.lab1.grid(row = 1, column = 0, padx = 10, pady = 10)
self.ent1 = tk.Entry(self, validate = "key", validatecommand = validCmd1)
self.ent1.grid(row = 1, column = 1)
self.lab2 = tk.Label(self, text = "Integer:")
self.lab2.grid(row = 2, column = 0, padx = 10, pady = (0,10))
self.ent2 = tk.Entry(self, validate = "key", validatecommand = validCmd2)
self.ent2.grid(row = 2, column = 1)
def val1(self, value):
try:
float(value)
except:
return False
else:
return True
def val2(self, value):
try:
int(value)
except:
return False
else:
return True
app = Form()
app.mainloop()
Instead of writing two different functions for two very similar tasks, I tried to pass an integer to the validate command (1 for float, 2 for integer). I tried to use lambdas to pass values to the validation functions, first on the self.register part: self.register(lambda: self.val1(1)) but this gave TypeError: <lambda>() takes 0 positional arguments but 1 was given and the second time I tried using lambda on the validatecommand command: validatecommand = lambda: validCmd1(1) which gives TypeError: 'tuple' object is not callable.Is it possible to pass values to a validation command?

Answer 1

The validatecommand option takes a tuple that can have any arguments you want. For example, if you want to pass an integer it's as easy as this:
validCmd1 = (self.register(self.val), 1, "%P")
validCmd2 = (self.register(self.val), 2, "%P")
def val(self, arg, value):
print(f"val1 arg='{arg}' value='{value}'")
...
Sometimes it's easier to understand if you separate the registration of the command from the value passed in to validatecommand. For example:
vcmd = self.register(self.val)
...
self.ent1 = tk.Entry(..., validatecommand = (vcmd, 1, "%P"))
self.ent2 = tk.Entry(..., validatecommand = (vcmd, 2, "%P"))