Labyrinth2

#python 3.5.2
from random import randint

UP = 1
RIGHT = 2
DOWN = 3
LEFT= 4

graph = {}
# graph = {'0:0': {'1': True, '3': True}, '0:1': {...}}

SIZE = 10

def addEdge(graph, x, y, direction):
    directions = {
        UP:     [0, -1],
        RIGHT:  [1,  0],
        DOWN:   [0,  1],
        LEFT:   [-1, 0]
    }
    x2 = x+directions[direction][0]
    y2 = y+directions[direction][1]
    if (x2 < 1) or (x2 > SIZE) or (y2 < 1) or (y2 > SIZE):
        return False
    node1 = str(x)+':'+str(y)
    node2 = str(x2)+':'+str(y2)
    if node2 not in graph:
        graph[node2] = {}
    graph[node1][direction] = True
    graph[node2][(direction+1)%4+1] = True
    return True

for x in range(1,SIZE+1):
    for y in range(1,SIZE+1):
        directions = []
        node = str(x)+':'+str(y)
        if node not in graph:
            graph[node] = {}
        d = randint(1, 4)
        while not addEdge(graph, x, y, d):
            d = randint(1, 4)

        d2 = randint(1, 4)
        while (d2 != d) and (not addEdge(graph, x, y, d2)):
            d2 = randint(1, 4)

row = "#"
for x in range(1,SIZE+2):
    row = row + "###"
print(row)

for y in range(1,SIZE+1):
    row = "#  "
    for x in range(1,SIZE+1):
        key = str(x)+':'+str(y)
        c = "  "
        if (RIGHT in graph[key]):
            c = "--"
        row = row + "+" + c
    print(row+"#")

    if y >= SIZE-1:
        break

    row = "#  "
    for x in range(1,SIZE+1):
        key = str(x)+':'+str(y)
        c = "  "
        if (DOWN in graph[key]):
            c = "| "
        row = row + c + " "
    print(row+"#")

row = "#"
for x in range(1,SIZE+2):
    row = row + "###"
print(row)