In [1]:

    

n = 5


    

In [2]:

    

[i*i for i in range(n)]


    

    
Out[2]:





[0, 1, 4, 9, 16]

In [3]:

    

a = []
for i in range(n):
    a.append(i*i)
a


    

    
Out[3]:





[0, 1, 4, 9, 16]

In [4]:

    

tuple(i*i for i in range(n))


    

    
Out[4]:





(0, 1, 4, 9, 16)

In [5]:

    

{i:i*i for i in range(n)}


    

    
Out[5]:





{0: 0, 1: 1, 2: 4, 3: 9, 4: 16}

In [6]:

    

{i:(i*i)%3 for i in range(n)}


    

    
Out[6]:





{0: 0, 1: 1, 2: 1, 3: 0, 4: 1}

In [7]:

    

{(i*i)%3:i for i in range(n**n)}


    

    
Out[7]:





{0: 3123, 1: 3124}

In [8]:

    

{(i*i)%3 for i in range(n**n)}


    

    
Out[8]:





{0, 1}

In [9]:

    

for j in (i*i for i in range(n)):
    print(j)


    

    




0
1
4
9
16

In [10]:

    

g = (i*i for i in range(n))
g


    

    
Out[10]:





<generator object <genexpr> at 0xb296cacc>

In [11]:

    

next(g)


    

    
Out[11]:





0

In [12]:

    

next(g)


    

    
Out[12]:





1

In [13]:

    

next(g)


    

    
Out[13]:





4

In [14]:

    

next(g)


    

    
Out[14]:





9

In [15]:

    

next(g)


    

    
Out[15]:





16

In [16]:

    

next(g)


    

    




---------------------------------------------------------------------------
StopIteration                             Traceback (most recent call last)
<ipython-input-16-5f315c5de15b> in <module>()
----> 1 next(g)

StopIteration: 

In [17]:

    

def fib():
    a, b = 0, 1
    while True:
        yield a
        a, b = b, a+b


    

In [18]:

    

f = fib()
f


    

    
Out[18]:





<generator object fib at 0xb210b234>

In [19]:

    

next(f)


    

    
Out[19]:





0

In [20]:

    

next(f)


    

    
Out[20]:





1

In [21]:

    

next(f)


    

    
Out[21]:





1

In [22]:

    

next(f)


    

    
Out[22]:





2

In [23]:

    

next(f)


    

    
Out[23]:





3

In [24]:

    

next(f)


    

    
Out[24]:





5

In [25]:

    

next(f)


    

    
Out[25]:





8

In [26]:

    

from itertools import islice


    

In [27]:

    

for i in islice(fib(), n):
    print(i)


    

    




0
1
1
2
3

In [28]:

    

list(islice(fib(), n))


    

    
Out[28]:





[0, 1, 1, 2, 3]