Functions in Python

# define a function with name foo
# all lines indented with respect to next line form the body of this function
def foo (var1, var2):  
  if (var1 == var2):
    print ("var1 equals var2")
  elif (var1 < var2):
    print ("var1 < var2")
  else:
    print ("var1 > var2")


# function foo can be called as follows:
foo (3,4)

# output:
var1 < var2

# If function was called as:
foo (5,4)

# Then output would have been
var1 > var2