''' Purpose: naming allows abstraction
'''

# get access to Python math comutational resources
import math             

# name a value
angle_of_interest_in_degrees = ...

# demonstrate the two math constants
print()

print( 'Python approximation of pi:', math.pi )
print( 'Python approximation of Euler\'s number:', math.e )

print()

reply = input( 'Enter when ready: ' )

print()

# perform and display some math computation
a = math.radians( angle_of_interest_in_degrees )
sin_a = math.sin( a )
tan_a = math.tan( a )

print( 'angle_of_interest_in_degrees =', angle_of_interest_in_degrees )

print()

print( 'rad( angle_of_interest_in_degrees ):', a )
print( 'sin( a ):', sin_a )
print( 'tan( a ):', tan_a )