import numpy as np
a, b = np.zeros(1), np.zeros(1)
a.dtype = 'int'
b = b.astype('int')
print(a[0] == 0, b[0] == 0)

import numpy as np
a, b = np.ones(1), np.ones(1)
a.dtype = 'int'
b = b.astype('int')
print(a[0] == 1, b[0] == 1)

import numpy as np
a = np.array([0, 1, -2, 3])
b = a[abs(a) % 2 == 0]
print(*b)

import numpy as np
a = np.array([1, 2, -1])
b = np.diff(a)
print(*b)

D = {}
A = D
B = D.copy()
B[ 'b' ] = 2
A[ 'b' ] = 3
print(D, B, A)

L = ['abc' , [(1, 2) , ([3] , 4)] , 5]
L[1][1][0][0]

with open('sample.txt', "w") as file_object:
    a = file_object.closed
b = file_object.closed        
print(a, b)

def f():
    yield 1
    yield 2
    yield 3
a, *b = f()
print(a, b)

class A:
    def __init__(self):
        self.i = 0
    def __iter__(self):
        return self
    def __next__(self):
        if self.i > 2:
            raise StopIteration
        self.i += 1
        return self.i
a, b, c = A()
print(a, b, c)

a, b, *c, d = (1,2,3,4,5,6)
print(c)

from collections import deque
q = deque(maxlen=3)
q.append(1)
q.appendleft(2)
q.append(3)
q.append(4)
q.popleft()
print(q.popleft())