''' Purpose: continue string manipulation introduction
'''

print()

# strings can produced strip versions of themselves -- a
# version without LEADING or TRAILING whitespace.  Internal
# whitespace is uneffected.  The ability comes from the string
# member method strip()
# ------------

q = "   Look there is a   Blibbering Humdinger  "

print( "q = '" + q + "'"  )

print(); input( "Enter when ready: " ); print()

print( "### mis-attempted stripping" )

q.strip()                   # q is uneffected. strip() produces
                            # a new string

# SPLIT AND STRIP
    # Doesn't change the original string it was called on
    # Calls the function on the string and hands back a modified version
    # We can store the new string handed back in a new variable (below)

print( "q = '" + q + "'"  )

print(); input( "Enter when ready: " ); print()

print( "### stripping" )

s = q.strip()               # q is still uneffected, but s is a
                            # stripped version of s (!!!)

print( "q = '" + q + "'"  )
print( "s = '" + s + "'" )

# Strings are immutable. Write this down!
# You cannot change strings directly.
# You need to store changed versions in a new variable.


print(); input( "Enter when ready: " ); print()

# strings can produce their component words.  The ability comes
# from the string member method split()
#                 -------------

print( "### splitting" )
# .split() separates at whitespace by default so it will produce
# ['bananas', $0.69']
# ['SEAS','CS','1112']

f = "bananas  $0.69"
c = "SEAS CS 1112"

print( "f = '" + f + "'" )
print( "c = '" + c + "'" )

print(); input( "Enter when ready: " ); print()


fruit, price = f.split()              # splits fruit into list of individual
                                      # words, which for this example is a
                                      # fruit and its cost

school, subject, number = c.split()   # splits person into list of indiviudal
                                      # words, which for this example is a
                                      # name, home planet, and age

print( fruit, "costs", price, "per pound" )
print( "School:", school, "  subject:", subject,
            "  number:", number )

### pause to think what has happened

print(); input( "Enter when ready: " ); print()

print( "### list making" ) # Just to separate the different concepts for you
# they're not real comments they're just there so you can quickly
# identify sections of new string material.

# A list is another type in Python. A LOT more on lists later.
# All this code does is it stores the list inside of a variable.
# so s1 stores the list ['bananas', '$0.69']

# f and c are still the strings they were assigned to.
# f.split() DOESNT CHANGE f !!!!!!!!!!!!!
# f is still a string but f.split() can just take that string,
# create a list of split words, and store it in a variable.

s1 = f.split()              # s1 is a 2-element list
s2 = c.split()              # s2 is a 3-element list

# Just like any other variable assignment you all have been doing,
# you're just assigning the value of the function (the list it gives you)
# to the variable.
# So summary: f and c are strings, they're not changed, and we call the
# function .split() on those strings and store them in separate lists
# but they don't change the original strings - the original strings
# in f and c don't become lists. Try printing f and c at the end. You'll
# see they're exactly the same!

# input() doesn't store things in variables but you could do something like
# this.
# three_words = input('Give me three words: ')
# words_list = three_words.split()
# w1, w2, w3 = words_list

print( "s1 = ", s1 )
print( "s2 = ", s2 )