python - Anyone good at nested loops? -


first post here fyi! got graph looks this:

graphs = {'g1': [ [ ['a1', 0], ['a2', 0] ], [ ['e1', 0] ], {'a1': ['e1'], 'a2': ['e1'] } ] }

what graph representing abstract data structure of graph nodes , edges basically. can represent 1 or several graphs.

i'm trying "reach" "a1" can write file example below:

a1,0;a2,0;a3,0

e1,0;e2,0

a1,e1,e2;a2,e1;a3,2

the intergers thing has 2 states 1 or 0 depending if have crossed or not crossed node or edge.

in order write file need nested loop reaches each node (vertex) , edge in graph.

i have yet not found tutorials nested loops items in lists. talk for in range(3): etc.

this code far:

def find_vertex(graphs):  key in graphs:     print(str(graphs[key][0][0][0]))

this prints out a1 but... yeah if want should use nested for-loop right?

i don't know how works. link of explained appreciated lot since don't seem grip this.

my solution, took time.

def save_graph(graphs): string = ""

tname = input("skriv in namnet på filens namn: ")  thand = open(tname, 'w')  key in graphs:     objekt in graphs[key][0]:         string += str(objekt[0]) + ","         string += str(objekt[1]) + ","     string += ";"     string += "\n" #print(string)  key in graphs:     objekt in graphs[key][1]:         string += str(objekt[0]) + ","         string += str(objekt[1]) + ","     string += ";"     string += "\n" graf in graphs:     key, value in graphs[graf][2].items():         string += (key) + "," + (value[0]) +  ";"  string = string.replace(",;", "") string = string[:-1] print(string)  thand.write(str(string)) thand.close()

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