chapter 3 variables and constant

string_double = "The language 'Python' is named after Monty Python, not the snake."
string_single = 'I told my friend, "Python is my favorite language!"'
string_mix = "One of Python's strengths is its diverse and supportive community."

print (string_double)
print (string_single)
print (string_mix)

t_name = "ada"
last_name = "lovelace"
full_name = first_name + " " + last_name
print (full_name)

p3-5 + - * / ** %

p3-11 += ...

p3-12 input (basic IO)

p3-13
>>> str=input('input string:')
>>> str
'test' #note single quote

# using eval to convert string into value
>>> i=eval( input('integet i=') )
3
>>> i


p3-17
r=eval (input ('r='))
a = r * r * 3.14
print ('a = %.2f' % a)

p3-17-2.py
import math
r=eval (input('r='))
a=r*r*math.pi
print ('a=%.2f' % a) 


input read in TWO 
--
x,y=input().split() #must split

x=eval(x)
y=eval(y)

print("x+y=", (x+y))
@