Chapter 17 Advanced Topics in Python¶

# 01 딕셔너리(Dictionaries)에 대한 반복자(Iterators)

my_dict = {
    "name" : "xuruiqi",
    "gender" : "male",
    "birthday" : "19910527"
}

print (my_dict.items())

# 02 keys()와 values()

my_dict = {
    "name" : "xuruiqi",
    "gender" : "male",
    "birthday" : "19910527"
}

print (my_dict.keys())
print (my_dict.values())

# 03 'in' 연산자

my_dict = {
    "name" : "xuruiqi",
    "gender" : "male",
    "birthday" : "19910527"
}

for e in my_dict:
    print (e, my_dict[e])
    
# 딕셔너리는 순서가 보장되지 않습니다!

# 04 리스트 만들기

evens_to_50 = [i for i in range(51) if i % 2 == 0]
print (evens_to_50)

# 05 리스트 내포(List Comprehensions) 문법

even_squares = [x ** 2 for x in range(1, 11) if x % 2 == 0]
even_squares

# 06 여러분의 차례입니다!

cubes_by_four = [x ** 3 for x in range(1, 11) if (x ** 3 % 4 == 0)]
print (cubes_by_four)

# 07 리스트 슬라이싱(List Slicing) 문법

l = [i ** 2 for i in range(1, 11)]
# Should be [1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

print (l[2:9:2])

# 08 색인(index) 생략하기

my_list = range(1, 11) # List of numbers 1 - 10

# Add your code below!
print (my_list[: : 2])

# 리스트의 내용을 출력하려면 (Python3)
print (*my_list[: : 2])

# 09 리스트 뒤집기

my_list = range(1, 11)

# Add your code below!
backwards = my_list[ : : -1]
print(*backwards)

# 10 스트라이드 길이 (Stride Length)

to_one_hundred = range(101)
# Add your code below!

backwards_by_tens = to_one_hundred[ : : -10]

print (*backwards_by_tens)

# 11 연습이 최고를 만듭니다 Practice Makes Perfect

to_21 = range(1, 22)
odds = to_21[ : : 2]  #[x for x in to_21 if x % 2 != 0]

middle_third = range(int(21 / 3 + 1), int(21 / 3 * 2 + 1))
print(*middle_third)

# 3등분의 중간

# 12 익명 함수 Anonymous Functions

my_list = range(16)
print (*filter(lambda x: x % 3 == 0, my_list))

# 13 람다(Lambda) 문법

languages = ["HTML", "JavaScript", "Python", "Ruby"]
print (*filter(lambda x: x == "Python", languages))

# 14 해보세요!

squares = [x ** 2 for x in range(1, 11)]
print (*filter(lambda x: x >= 30 and x <= 70, squares))

# 15 딕셔너리(Dictionaries) 반복하기

movies = {
    "Monty Python and the Holy Grail": "Great",
    "Monty Python's Life of Brian": "Good",
    "Monty Python's Meaning of Life": "Okay"
}

print (movies.items())

# 16 리스트 내포(list comprehension) 이해하기

threes_and_fives = [x for x in range(1, 16) if x % 3 == 0 or x % 5 == 0]

threes_and_fives

# 17 리스트 슬라이싱(List Slicing)

garbled = "!XeXgXaXsXsXeXmX XtXeXrXcXeXsX XeXhXtX XmXaX XI"
message = "".join(x for x in garbled[ : : -1] if x != 'X')
print (message)

# 18 람다 표현

garbled = "IXXX aXXmX aXXXnXoXXXXXtXhXeXXXXrX sXXXXeXcXXXrXeXt mXXeXsXXXsXaXXXXXXgXeX!XX"
message = filter(lambda x: x != 'X', garbled)
print (*message)