Maps (aka Associative Arrays)

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Maps1.py

#!/usr/bin/env python3;
import Utils

# Begin Main
dictionary = {}

print("dictionary size: " + str(len(dictionary)))
print("dictionary is " + ("empty" if not dictionary else "not empty"))
dictionary["apple"] = "red"
dictionary["banana"] = "yellow"
dictionary["cantaloupe"] = "orange"
dictionary["dragonfruit"] = "red"
dictionary["elderberry"] = "purple"

print("dictionary size: " + str(len(dictionary)))
print("dictionary is " + ("empty" if not dictionary else "not empty"))

print("bananas are " + dictionary["banana"])

x = "dragonfruit"
if ((x in dictionary.keys())) :
	print(x + " are " + dictionary[x])
else :
	print("Can't find " + x)

x = "fig"
if ((x in dictionary.keys())) :
	print(x + " are " + dictionary[x])
else :
	print("Can't find " + x)

x = "elderberry"
Utils.mapRemove(dictionary, x)
if ((x in dictionary.keys())) :
	print(x + " are " + dictionary[x])
else :
	print("Can't find " + x)

print(Utils.mapToString(dictionary))

Output

$ python3 Maps1.py dictionary size: 0 dictionary is empty dictionary size: 5 dictionary is not empty bananas are yellow dragonfruit are red Can't find fig Can't find elderberry {"apple" => "red", "banana" => "yellow", "cantaloupe" => "orange", "dragonfruit" => "red"}

Maps2.py

#!/usr/bin/env python3;
import Utils

# Begin Main
planetDiameters = {
	"Mercury": 4879,
	"Venus": 12103,
	"Earth": 12756,
	"Mars": 6794,
	"Jupiter": 142985,
	"Saturn": 120534,
	"Uranus": 51115,
	"Neptune": 49534,
	"Pluto": 2374,
	"Ceres": 946,
	"Eris": 2326,
	"Makemake": 1430
}

for planet in planetDiameters.keys() :
	print(planet + " has a diameter of " + str(planetDiameters[planet]) + " km")

Output

$ python3 Maps2.py Mercury has a diameter of 4879 km Venus has a diameter of 12103 km Earth has a diameter of 12756 km Mars has a diameter of 6794 km Jupiter has a diameter of 142985 km Saturn has a diameter of 120534 km Uranus has a diameter of 51115 km Neptune has a diameter of 49534 km Pluto has a diameter of 2374 km Ceres has a diameter of 946 km Eris has a diameter of 2326 km Makemake has a diameter of 1430 km

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References

[[Python Language Reference]]
[[Python Standard Library]]
[[Python at TutorialsPoint]]