View source for Moving around a small grid

[[File:square.png|right|frame|This a problem set for you to work through]]

This is a problem set. Some of these are easy, others are far more difficult. The purpose of these problems sets are to HELP YOU THINK THROUGH problems. The solution is at the bottom of this page, but please don't look at it until you have tried (and failed) at least three or four times. 

== The Problem ==

This problem is designed to test your skill and knowledge of [[functions]], [[variables]] and [[computational thinking]].  
  
You have a simple 10 x 10 grid, with your character at the center (5,5). You can move up, down, left and right. Add:

* terrain
* a bad guy
* combat
* basic AI
* basic statistics for the bad guy (or you) like Hit Points, Armour, Power, etc...

== Some Code to Get You Started ==

<syntaxhighlight lang="python" line="1" >
#
# this is the start of a simple game on a 10 x 10 grid that let's players move around in a fairly simple way.
#
# currently, all we have is movement and updating the board. But if a student wanted to add TERRAIN, BAD GUYS, COMBAT, and maybe even BASIC AI
# that would be pretty cool, huh?

current_player_y_position = 5
current_player_x_position = 5
    
def move(direction,pos_y,pos_x):
    global current_player_x_position
    global current_player_y_position
    if direction == "up":
        if pos_y == 1:
            print("-----------------------")
            print("You cannot go that way.")
            print("-----------------------")
            foo = raw_input("Press enter to continue...")
        else:
            print("-----------------------")
            print("You walk up one square. ")
            print("-----------------------")
            current_player_y_position = current_player_y_position - 1
            foo = raw_input("Press enter to continue...")  
    elif direction == "right":
        if pos_x == 10:
            print("-----------------------")
            print("You cannot go that way.")
            print("-----------------------")
            foo = raw_input("Press enter to continue...")
        else:
            print("---------------------------")
    	    print("You walk right one square. ")
            print("---------------------------")
            current_player_x_position = current_player_x_position +1
            foo = raw_input("Press enter to continue...")   
    elif direction == "left":
        if pos_x == 1:
            print("-----------------------")
            print("You cannot go that way.")
            print("-----------------------")
            foo = raw_input("Press enter to continue...")
        else:
            print("---------------------------")
    	    print("You walk left one square. ")
            print("---------------------------")
            current_player_x_position = current_player_x_position -1
            foo = raw_input("Press enter to continue...")
    elif direction == "down":
        if pos_y == 10:
            print("-----------------------")
            print("You cannot go that way.")
            print("-----------------------")
            foo = raw_input("Press enter to continue...")
        else:
            print("-----------------------")
            print("You walk down one square. ")
            print("-----------------------")
            current_player_y_position = current_player_y_position + 1
            foo = raw_input("Press enter to continue...")              
    return 
    
 
 
def update_board(x_position, y_position):
    if x_position == current_player_x_position and y_position == current_player_y_position:
        token = "T"
    else:
        token = "_"
    return token
 
 
def draw_board():
    y_counter = 1
    x_counter = 1
    counter_heading = 1
    print("\n")
    print(" " * 4),
    while counter_heading < 11:
        print(str(counter_heading).zfill(2) + "   "),
        counter_heading = counter_heading + 1
    print("\n")
 
    while y_counter < 11:
        print(str(y_counter).zfill(2) + " |"),  
        while x_counter < 11:    
            print("_" + update_board(x_counter, y_counter) + "_ |"),    
            x_counter = x_counter + 1
        print("\n")
        y_counter = y_counter + 1
        x_counter = 1
 
def help():
    print("\n")
    print("Type 99 to quit. Type up, down, left, right to move around.")
    print("-----------------------------------------------------------")
    foo = raw_input("Press enter to continue...")    
    return
       
def main():
    global current_player_y_position
    global current_player_x_position
    while True:
        draw_board()
        choice = raw_input("What do you want to do (type help for help) > ")
        if choice == "99":
            break
        elif choice == "help":
            help()
        elif choice == "up":
             move('up',current_player_y_position,current_player_x_position)
        elif choice == "right":
             move('right',current_player_y_position,current_player_x_position)
        elif choice == "left":
             move('left',current_player_y_position,current_player_x_position) 
        elif choice == "down":
             move('down',current_player_y_position,current_player_x_position)                        
    return
 
main()
</syntaxhighlight>

== Take This Farther ==

This simple function is very useful, and it is likely that you have used a function like this to add bold face text to a google doc. 

* Please create a function that creates a link. <syntaxhighlight lang="python" inline><a href="http://reddit.com/r/python">Click here</a></syntaxhighlight>. You will need the link and text to display to the user. 
* Add some logic which rejects [http://www.w3schools.com/tags/ref_html_dtd.asp invalid HTML tags]

== How you will be assessed ==

Every problem set is a formative assignment.  [[Media:Problem-setrubric.pdf|Please click here to see how you will be graded]]

== References ==

* Icons made by [http://www.freepik.com Freepik] from [http://www.flaticon.com www.flaticon.com] is licensed by [http://creativecommons.org/licenses/by/3.0/ CC 3.0 BY]
<references />

== One Possible Solution ==


<div class="toccolours mw-collapsible mw-collapsed">
Click the expand link to see one possible solution, but NOT before you have tried and failed! 
<div class="mw-collapsible-content">
<syntaxhighlight lang="python" line="1" >

#
# this function returns a HTML opening and closing pair of tag
#

def make_tags(tag, word):

    print("<" + tag + ">" + word + "</" + tag + ">")

    return

# example input: 
# make_tags('i','Hello world')
 
# example output:
# <i>Hello world</i>
</syntaxhighlight>

</div>
</div>
[[Category:problem set]]
[[Category:python]]
[[Category:strings]]