PROGRAMMING

  MINTE9
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Input

p187 ! Input validation code checks user's entered values.
 
"""Input validation:
We repeatedly ask user for input values.
"""

while True:
    age = input('What is your age? ')
    try:
        age = int(age)
    except:
        print('Please use numberic values!')
        continue
    if age < 0:
        print('Please enter a positive number!')
        continue

    break

print(f'Your age is: {age}')
    # What is your age? abc
    # Please use numberic values!
    # What is your age? -10
    # lease enter a positive number!
    # What is your age? 20
    # Your age is: 20
p188

Plus

Pyinputplus module has useful features like limit of tries.
 
"""Pyinputplus 
Contains functions similar to input() for other kind of data:
number, date, email, adress
Pyinputplus is not part of the standard distribution.
pip install pyinputplus
Import as pyip save us from typing pyinputplus every time.
"""
import pyinputplus as pyip

response = pyip.inputNum('What is your age? ', min=10, limit=4)
print(f'Your age is: {response}')
    # What is your age? 6
    # Number must be at minimum 10.
    # What is your age? -10
    # Number must be at minimum 10.
    # What is your age? abc
    # 'abc' is not a number.
    # What is your age? 5
    # Exception: pyinputplus.RetryLimitException

response = pyip.inputMenu(['dog', 'cat', 'horse'], lettered=True,
    prompt='What is your favorite animal? \n'
)
print(f'Your favorite animal is: {response}')
    # What is your favorite animal? 
    # A. dog
    # B. cat
    # C. horse
    # b
    # Your favorite animal is: cat

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