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10-6. Addition:

From

Cover of Python Crash Course

Note

def add():
num1 = raw_input('num1: ')
num2 = raw_input('num2: ')
try:
n1 = float(num1)
n2 = float(num2)
except ValueError:
print('*input is not number!*')
else:
print(str(n1) + ' + ' + str(n2) + ' = ' + str(n1 + n2))