# Define a class 
class SomeClass:
	def __init__(self, arg0):
		self.classMemberVar0 = arg0
		print ('In __init__(), constructing a SomeClass object with classMemberVar0 == ' + \
			self.classMemberVar0)

# Create a function that is global to this module
def MyGlobalFunction(arg0):
	print 'In MyGlobalFunction, arg0 has the value ' + str(arg0)
	localVariabletoMyGlobalFunction = 333
	print 'In MyGlobalFunction, localVariabletoMyGlobalFunction has the value ' + \
		str(localVariabletoMyGlobalFunction)

# define a variable global to the entire module
moduleGlobalVar = 222


if True:	# an if statement that will always be executed
	# define another variable to the entire module here. Even though we are inside an 'if' 
	# block, code blocks like this ('for' blocks are another example) do not restrict scope.
	# So, moduleGlobalVar and anotherModuleGlobalVar have the same scope.
	anotherModuleGlobalVar = 444

	# Make an object sc of SomeClass 
	sc = SomeClass('jim')
	# We can see values of class member variables outside of the class if we refer to the object
	# that the variable belongs to. If we had more than one object of this class, then the same
	# member variable could have different values within each object.
	print 'From main, I can see that sc.classMemberVar0 has the value ' + str(sc.classMemberVar0)
	# Call MyGlobalFunction
	MyGlobalFunction('fred')
	# Uncommenting the 2 lines in print below creates an error because localVariabletoMyGlobalFunction is not
	# defined in the current scope. Even though we passed 'fred' as an argument that ended up being
	# assigned to localVariabletoMyGlobalFunction, we cannot 'see' that variable  here--it's out of scope
	# print 'If I try to print the value of localVariabletoMyGlobalFunction from main, I get ' + \
	#    str(localVariabletoMyGlobalFunction)

print 'outside of if __name__, I can see that the value of anotherModuleGlobalVar is ' + \
     str(anotherModuleGlobalVar) + 'even though it was defined in an if block that I am external to'

# Create a for loop. Like an if statement, the block of code attached to a for loop does not further
# restrict scope. So, the value of fred is visible outside the loop.
for i in range (0,5):
	fred = 'my name is fred'
	pass

print 'Outside of the for loop, we can see that fred has the value of ' + fred