I am reading the documentation and I'm in the section 4.1. Let me
write it down here:
>>> x = int(input("Please enter an integer: "))
Please enter an integer: 42
>>> if x < 0:
... x = 0
... print('Negative changed to zero')
... elif x == 0:
... print('Zero')
... elif x == 1:
... print('Single')
... else:
... print('More')
...
More
Now I want to add a filter in this script, I want when a user enter a
string here it give a warning "Please enter a number like 0 or 2".
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