023_list_comprehensions.py

# Dajme tomu ze mame ulohu kazde parne cislo v intervale od 0 po 20 vynasob desiatimi
# Ako by sme to vyriesili ?
numbers = range(1, 21)
result = []
for i in numbers:
    if i % 2 == 0:
        result.append(i*10)
print(result)

# Lsit comprehension
# if and else part are optional
# [<return_value> for <variable_name> in <list> if <condition>]
results = [number*10 for number in numbers if number % 2 == 0]
print(results)

# Kazde parne cisla vynasob 10 a kazde neparne cislo vynasob 30 
# V list comprehensions nie je else ale vieme sa vynajst 
results = [number*10 if number % 2 == 0 else number*30 for number in numbers]
print(results)


# Majme retazec na vstupe a na vystupe chceme pole cisel ktore nesie informaciu o pocte pismen pre kazde slovo v retazci 
string = "Informatika s misom je cool"
# pomocou .split() funkcie viem rozdelit retazec na pole slov 
print(string.split())
print([len(word) for word in string.split()])

# Triky na koniec 
arr = ["this", "is", "string"]
print(" ".join(arr))

# Domaca uloha 
# Napis funkciu list_of_lists ktora dostane na vstupe cez parameter pole celych cisel vacsich ako 0 napr. [0,2,3,2]
# Nasledne vrati pole cisel ktore bude obsahovat pre kazde cislo pole s cislami od 0 po to dane cislo

# pre vstup [0,2,3,2]
# vrati [[0], [0,1,2], [0,1,2,3], [0,1,2]]
# Musti to btr funkcia !!