「自作Python100本ノック」6日目（丸1日Python生活：26本〜30本目） ref: https://qiita.com/ahpjop/items/81d093623ae4125112c5

q26.py

#1
things = ["mozzarella","cinderella","salmonella"]

#２
things[0] = things[0].capitalize()
things

#３
things[1] = things[1].upper()
things

#４
things[2] = things[2].upper()
things[2] = things[2][::-1]
things[2] = things[2]

q27.py

#1
e2f = {"dog":"chien","cat":"chat","walrus":"mourse"}
e2f

#2
e2f["walrus"]

#3
f2e = {}
for english, french in e2f.items(): #辞書のすべての値を取得するには、items()を使う
    f2e[french] = english
f2e

#4
set(e2f.keys())

q28.py

#1
life = {"animals":{
            "cats":["Henri","Grumpy","lucy"],
            "dogs":{},
            "birds":{}},
        "plants":{},
        "other":{}
        }

#2
print(life.keys())

#3
print(life["animals"].keys())

#4
print(life["animals"]["cats"])

q29.py

even = [number for number in range(50) if number % 2 == 0]
even

q30.py

squares = {key: key * key for key in range(50)}
squares