PhoenixIM

#Generator Expression

num_cube_lc=[n**3 for n in range(1,11) if n%2==0]    #List Comprehension
num_cube_generator=(num**3 for num in range(1,11) if num%2==0)  #Generator Expression

print(f"List Comprehension = {num_cube_lc}")
print(f"Generator Expression = {num_cube_generator}")

#sum(num_cube_generator)
print(f"Sum = {sum(num_cube_generator)}")

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

for chips in can_of_pringles:         
    print(f"Taking out chip {chips}")

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print(dir(can_of_pringles))

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print(next(can_of_pringles))

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#creating an iterator    
iterator_COP=iter(can_of_pringles)  

print(f"\nType of 'can_of_pringles': {type(can_of_pringles)}")

print(f"\nType of 'iterator_COP': {type(iterator_COP)}")

print(f"\nIterator : {iterator_COP}")

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print(dir(iterator_COP))

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print(next(iterator_COP))
print(next(iterator_COP))

for chips in iterator_COP:         
    print(f"Taking out chip {chips}")

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#will raise StopIteration exception
print(next(iterator_COP))

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#can be executed as many times as we want
print("Iterable:")
for i in range(3):
    for chips in can_of_pringles: 
        print(chips,end=" ")
    print("\n")    

#can be executed only once
print("Iterator:")
for j in range(3):

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#storage comparision
from sys import getsizeof

list_num=[n1 for n1 in range(1000000000)]   #list-comprehension
gen_num=(n2 for n2 in range(1000000000))    #generator-expression

print(f"Size of a list: {getsizeof(list_num)} bytes")
print(f"Size of a generator: {getsizeof(gen_num)} bytes")