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In [5]:

    
def sum(*args):
    total = 0
    for arg in args:
        total += arg
    return total



In [6]:

    
sum(1,2,3,4)









    Out[6]:





10



In [7]:

    
def greeting(name, why, course):
    print("{name} | {course} | {why}".format(name = name, course = course, why=why))



In [8]:

    
values = ("jy", "DataScientist", "study")



In [9]:

    
# unpack / unpacking
greeting(*values)









    



jy | study | DataScientist



In [ ]:

    
# unnamed -> *args (tuple)
# named -> **kwargs (dict)



In [10]:

    
def information(**kwargs):
    for key, value in kwargs.items():
        print ("(key) -> (value)".format(key = key, value = value))



In [13]:

    
information = {"name" : "jy", "email" : "jiyong@"}



In [14]:

    
print information









    



{'name': 'jy', 'email': 'jiyong@'}



In [28]:

    
# Lambda



In [30]:

    
increment_lambda = lambda x : x+1



In [32]:

    
increment_lambda(23)









    Out[32]:





24



In [35]:

    
(lambda x,y : x+y)(1,2)









    Out[35]:





3



In [ ]:

    
# [ 1, 2, 3] -> [1, 4, 9]



In [36]:

    
def change(numbers):
    list = []
    for number in numbers:
        list.append(number**2)
    return list



In [37]:

    
change([1,2,3])









    Out[37]:





[1, 4, 9]



In [38]:

    
def square(x):
    return x**2



In [39]:

    
list(map(square, [1,2,3]))









    Out[39]:





[1, 4, 9]



In [40]:

    
list(map(lambda x: x**2, [1,2,3,4]))









    Out[40]:





[1, 4, 9, 16]



In [43]:

    
map(lambda x : x**2, [1,2,3,4])









    Out[43]:





[1, 4, 9, 16]



In [44]:

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



In [48]:

    
list(filter(lambda x : x>5, numbers))









    Out[48]:





[6, 7, 8]



In [ ]:

    
# map -> 모든 elements -> 새로운 List
# filter -> 모든 elements => True인 Element 만 새로운 List



In [ ]:

    
# Reduce -> 줄이고, 하나만 남기는



In [50]:

    
functools.reduce(lambda x,y : x+y, [10, 20, 30, 40])









    Out[50]:





100



In [53]:

    
def max(numbers):
    max_number = numbers[0]
    for number in numbers:
        if number > max_number:
            max_number = number
            
    return max_number



In [54]:

    
max([1,14,7,8,4])









    Out[54]:





14



In [69]:

    
reduce(lambda x,y : x if x<y else y, [1,14,7,8,4])









    Out[69]:





1



In [70]:

    
awesome_list = [1,2, "jy", {}, [], 4,5]



In [76]:

    
list(map(lambda x : x**2, list(filter(lambda x: isinstance(x, int), awesome_list))))









    Out[76]:





[1, 4, 16, 25]



In [81]:

    
# 1 - 100 까지 숫자 중에서 짝수
[i **2 for i in range(1, 101) if i%2 == 0]



In [92]:

    
MAX = 1000

not_prime_list = [
    j
    for i in range(2, int(MAX **0.5)+1)
    for j in range(i**2, MAX, i) 
]
prime_list = [
    i
    for i in range(2, MAX +1)
    if i not in not_prime_list

]
prime_list