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import array

a = array.array('B', [1, 2, 3])

print(a, len(a))

i = array.array('I', [1, 2, 3])

print(i, len(i))

print(a[0])

print(i[-1])

# Empty arrays

print(len(array.array('h')))

print(array.array('i'))

# bool operator acting on arrays

print(bool(array.array('i')))

print(bool(array.array('i', [1])))

# bad typecode

try:

array.array('X')

except ValueError:

print("ValueError")