#                                                           variables.py
#
# Establishing a variale name with a value associated with the name

message = "What's up?"

print message


# Updating the value of the variable with a new value

message = "What's down?"

print message

# Establishing a name with a value initially and then updating the value
# as you compute in your program is a pattern we use a lot, specially in
# Python.  So, remember this pattern.

# The variable message here happens to have a string value at this point,
# but you can even assign an integer as its value at this point in the
# program like this:

message = 234

print message

# But, it is usually not a good idea (not a good programming style) to mix
# different types of values for a given variable unless it is logically
# necessary to do so in your program.
# Programs are much easier to understand if you keep the variables with
# values of the same type throughtout the lifetime of the variables.
# In other languages such as Java changing the type of a variable like this
# in mid-stream is not even allowed. 


# Here are some more variables with some values assigned.

n = 22
print n

n = 23
print n

pi = 3.14159
print pi


# We already know how to get the types.  Let's try them again here.

print type (message)

message = "back to string again"

print type (message)

print type (n)

print type (pi)


# We can try some boolean variables, i.e., the variables with boolean
# values (aka logical values, namely, True or False).  For example,

larger = (45 > 10)
print larger

larger = (45 < 10)
print larger

same = (34 == 34)
print same
print type(same)


# You will find variables useful as you write more complex programs.