파이썬 정규표현식/ ZIP, SET함수 , YIELD제너레이터

>>> nums = [1,2,3,4,5,6,7]

>>> 

>>> my_list=[n for n in nums]

       #my_list = []

       #for n in nums:

              my_list.append(n)

>>> print(my_list)

[1, 2, 3, 4, 5, 6, 7]

---

>>> nums = [1,2,3,4,5,6,7]

>>> my_list = [n*n for n in nums]

       #my_list = []

       #for n in nums:

                my_list.append(n*n)

>>> print(my_list)

[1, 4, 9, 16, 25, 36, 49]

---

>>> nums = [1,2,3,4,5,6,7,9,10]

>>> #my_list = []

>>> #for n in nums:

     if n % 2 == 0:

my_list.append(n)

>>> #print(my_list)

nums = [1,2,3,4,5,6,7,9,10]

>>> my_list=[n for n in nums if n%2 == 0]

>>> print(my_list)

[2, 4, 6, 10]

---

>>> #my_list=[]

>>> #for letter in 'abcd':

   for num in range(4):

my_list.append((letter,num))

my_list=[(letter, num) for letter in 'abcd' for num in range(4)]

>>> print(my_list)

[('a', 0), ('a', 1), ('a', 2), ('a', 3), ('b', 0), ('b', 1), ('b', 2), ('b', 3), ('c', 0), ('c', 1), ('c', 2), ('c', 3), ('d', 0), ('d', 1), ('d', 2), ('d', 3)]

---

-ZIP 함수는 2개의 리스트를 1개의 딕셔너리로 짝짓고 싶을때 사용한다.

>>> names = ['bruce', 'clark', 'peter', 'logan', 'wade']

>>> heros = ['batman', 'superman', 'spiderman', 'wolverine', 'deadpool']

>>>#my_dict = {}

>>>#for name, hero in zip(names, heros):

        my_dict[name] = hero

      #print(my_dict)

my_dict = { name:hero for name, hero in zip(names, heros)}

>>> print(my_dict)

{'bruce': 'batman', 'clark': 'superman', 'peter': 'spiderman', 'logan': 'wolverine', 'wade': 'deadpool'}

---

-정규표현식은 읽기 쉬울뿐 아니라 아래 빨간색처럼 함수를 추가하기도 쉽다.

>>> my_dict = { name:hero for name, hero in zip(names, heros) if name != 'peter'}

>>> print(my_dict)

{'bruce': 'batman', 'clark': 'superman', 'logan': 'wolverine', 'wade': 'deadpool'}

---

-SET 함수는 리스트에서 중복되는 값을 제외하고 고유값만 뽑아낸다. 

nums = [1,1,2,1,3,4,3,4,5,5,6,7,8,9,9]

>>> #my_set = set()

>>> #for n in nums:

  my_set.add(n)

>>> #print(my_set)

{1, 2, 3, 4, 5, 6, 7, 8, 9}

nums = [1,1,2,1,3,4,3,4,5,5,6,7,8,9,9]

>>> my_set = {n for n in nums}

>>> print(my_set)

{1, 2, 3, 4, 5, 6, 7, 8, 9}

---

-제너레이터, yield

>>> nums = [1,2,3,4,5,6,7,8,9,10]

>>> #def gen_func(nums):

    for n in nums:

yield n*n

>>> #my_gen = gen_func(nums)

>>> #for i in my_gen:

       #print(i)

>>> nums = [1,2,3,4,5,6,7,8,9,10]

>>> my_gen = (n*n for n in nums)

>>> 

>>> for i in my_gen:

print(i)

1

4

9

16

25

36

49

64

81

100