validation function should return None when the check passes, otherwise an error message will be returned: def check_age(p): # return None when the check passes, otherwise return the error ˓→message 'Too young!!' if p > 60: return 'Too old!!' age = input("How old are you?", type=NUMBER, validate=check_age) When the user input an illegal value, the input field is displayed as follows: 10 Chapter 4 input('Input your name', name='name'), input('Input your age', name='age', type=NUMBER, validate=check_age) ]) put_text(data['name'], data['age']) The input group also supports using validate parameter

validation function should return None when the check passes, otherwise an error message will be returned: def check_age(p): # return None when the check passes, otherwise return the error ˓→message 'Too young!!' if p > 60: return 'Too old!!' age = input("How old are you?", type=NUMBER, validate=check_age) When the user input an illegal value, the input field is displayed as follows: 10 Chapter 4 input('Input your name', name='name'), input('Input your age', name='age', type=NUMBER, validate=check_age) ]) put_text(data['name'], data['age']) The input group also supports using validate parameter

validation function should return None when the check passes, otherwise an error message will be returned: def check_age(p): # return None when the check passes, otherwise return the error ˓→message 'Too young!!' if p > 60: return 'Too old!!' age = input("How old are you?", type=NUMBER, validate=check_age) When the user input an illegal value, the input field is displayed as follows: 10 Chapter 4 input('Input your name', name='name'), input('Input your age', name='age', type=NUMBER, validate=check_age) ]) put_text(data['name'], data['age']) The input group also supports using validate parameter

validation function should return None when the check passes, otherwise an error message will be returned: def check_age(p): # return None when the check passes, otherwise return the error ˓→message 'Too young!!' if p > 60: return 'Too old!!' age = input("How old are you?", type=NUMBER, validate=check_age) When the user input an illegal value, the input field is displayed as follows: 10 Chapter 4 input('Input your name', name='name'), input('Input your age', name='age', type=NUMBER, validate=check_age) ]) put_text(data['name'], data['age']) The input group also supports using validate parameter

validation function should return None when the check passes, otherwise an error message will be returned: def check_age(p): # return None when the check passes, otherwise return the error ˓→message 'Too young!!' if p > 60: return 'Too old!!' age = input("How old are you?", type=NUMBER, validate=check_age) When the user input an illegal value, the input field is displayed as follows: 10 Chapter 4 input('Input your name', name='name'), input('Input your age', name='age', type=NUMBER, validate=check_age) ]) put_text(data['name'], data['age']) The input group also supports using validate parameter

validation function should return None when the check passes, otherwise an error message will be returned: def check_age(p): # return None when the check passes, otherwise return the error ˓→message 'Too young!!' if p > 60: return 'Too old!!' age = input("How old are you?", type=NUMBER, validate=check_age) When the user input an illegal value, the input field is displayed as follows: 10 Chapter 4 input('Input your name', name='name'), input('Input your age', name='age', type=NUMBER, validate=check_age) ]) put_text(data['name'], data['age']) The input group also supports using validate parameter

validation function should return None when the check passes, otherwise an error message will be returned: def check_age(p): # return None when the check passes, otherwise return the error ˓→message 'Too young!!' if p > 60: return 'Too old!!' age = input("How old are you?", type=NUMBER, validate=check_age) When the user input an illegal value, the input field is displayed as follows: 10 Chapter 4 input('Input your name', name='name'), input('Input your age', name='age', type=NUMBER, validate=check_age) ]) put_text(data['name'], data['age']) The input group also supports using validate parameter

validation function should return None when the check passes, otherwise an error message will be returned: def check_age(p): # return None when the check passes, otherwise return the error ˓→message 'Too young!!' if p > 60: return 'Too old!!' age = input("How old are you?", type=NUMBER, validate=check_age) When the user input an illegal value, the input field is displayed as follows: 10 Chapter 4 input('Input your name', name='name'), input('Input your age', name='age', type=NUMBER, validate=check_age) ]) put_text(data['name'], data['age']) The input group also supports using validate parameter

validation function should return None when the check passes, otherwise an error message will be returned: def check_age(p): # return None when the check passes, otherwise return the error ˓→message 'Too young!!' if p > 60: return 'Too old!!' age = input("How old are you?", type=NUMBER, validate=check_age) When the user input an illegal value, the input field is displayed as follows: 10 Chapter 4 input('Input your name', name='name'), input('Input your age', name='age', type=NUMBER, validate=check_age) ]) put_text(data['name'], data['age']) The input group also supports using validate parameter

validation function should return None when the check passes, otherwise an error message will be returned: def check_age(p): # return None when the check passes, otherwise return the error ˓→message 'Too young!!' if p > 60: return 'Too old!!' age = input("How old are you?", type=NUMBER, validate=check_age) When the user input an illegal value, the input field is displayed as follows: 10 Chapter 4 input('Input your name', name='name'), input('Input your age', name='age', type=NUMBER, validate=check_age) ]) put_text(data['name'], data['age']) The input group also supports using validate parameter