python自带函数——浮点值 float()

#带很多位小数的值

>>> print(abs(10))

10

>>> float('123.456789')

123.456789

>>> your_age = input('Enter your age: ')

Enter your age: 20

>>> age = float(your_age)

>>> if age > 13:

print('You are %s years too old' % (age - 13))

You are 7.0 years too old