How to convert str to int with default value

Question

I have variable d int.

d = int(input("1 - to enter expression; 2 - to enter text; 3 - to exit. "))

But if you do not enter a number then the program crashes with an error. To avoid this I write this:

d = (lambda x = input("1 - to enter expression; 2 - to enter text; 3 - to exit. "): int(x) if x.isdigit() else: 3)

but get an error

SyntaxError: invalid syntax.

Answer 1

d = input("1 - to enter expression; 2 - to enter text; 3 - to exit. ")
try:
    d = int(d)
except ValueError:
    d = 3  # the default value