import numpy as np
a = np.array([0.1, 0.25])
b = np.array([0.3, 0.26])
c = np.isclose(a, b, atol=1e-1)
print(*c)

import numpy as np
a = np.array([np.nan])
b = np.array([np.nan])
x = np.isclose(a, b)
y = np.isclose(a, b, equal_nan=True)
print(*x, *y)

import numpy as np
a = np.array([0.1, 0.25])
b = np.array([0.1, 0.26])
c = np.allclose(a, b, atol=1e-1)
print(c)

import numpy as np
a = np.array([1, 1])
b = np.ndarray([1, 1])
print(*(a.shape + b.shape))

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]