Iterate over a dictionary

We can use the for loop to iterate over all the keys in a dictionary:

d = {'apple':'red', 'pear':'green', 'banana':'yellow', 'plum':'purple'}

for k in d:
    print(k, ' is ', d[k])

Console result (the order may be different):

apple is red
pear is green
banana is yellow
plum is purple

Here in the for loop, variable k receives the keys of dictionary d ('apple', 'pear', ...). Then d[k] is used to access the value paired with the key k ('red', 'green', ...).

Demo Dictionaries in CodeCraft

We can use a dictionary to store column colors and height values to build columns. .

Example:

collection = {'box_red':10, 'box_green': 6, 'box_blue': 8, 'box_pink':2}

x = 0
for m in collection:
  print(m)
  column(x, -20, collection[m], m)
  x += 2

See console result:

box_red
box_green
box_blue
box_pink