94 lines
1.6 KiB
Python
94 lines
1.6 KiB
Python
# test memoryview
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try:
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memoryview
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except:
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import sys
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print("SKIP")
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sys.exit()
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# test reading from bytes
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b = b'1234'
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m = memoryview(b)
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print(len(m))
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print(m[0], m[1], m[-1])
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print(list(m))
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# test writing to bytes
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try:
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m[0] = 1
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except TypeError:
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print("TypeError")
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# test writing to bytearray
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b = bytearray(b)
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m = memoryview(b)
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m[0] = 1
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print(b)
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print(list(m))
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# test slice
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m = memoryview(b'1234')
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print(list(m[1:]))
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print(list(m[1:-1]))
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# this tests get_buffer of memoryview
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m = memoryview(bytearray(2))
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print(bytearray(m))
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print(list(memoryview(memoryview(b'1234')))) # read-only memoryview
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import array
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a = array.array('i', [1, 2, 3, 4])
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m = memoryview(a)
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print(list(m))
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print(list(m[1:-1]))
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m[2] = 6
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print(a)
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# test slice assignment between memoryviews
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b1 = bytearray(b'1234')
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b2 = bytearray(b'5678')
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b3 = bytearray(b'5678')
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m1 = memoryview(b1)
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m2 = memoryview(b2)
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m3 = memoryview(b3)
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m2[1:3] = m1[0:2]
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print(b2)
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b3[1:3] = m1[0:2]
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print(b3)
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m1[2:4] = b3[1:3]
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print(b1)
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try:
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m2[1:3] = b1[0:4]
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except ValueError:
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print("ValueError")
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try:
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m2[1:3] = m1[0:4]
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except ValueError:
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print("ValueError")
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try:
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m2[0:4] = m1[1:3]
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except ValueError:
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print("ValueError")
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# test memoryview of arrays with items sized larger than 1
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a1 = array.array('i', [0]*5)
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m4 = memoryview(a1)
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a2 = array.array('i', [3]*5)
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m5 = memoryview(a2)
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m4[1:3] = m5[1:3]
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print(a1)
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try:
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m4[1:3] = m2[1:3]
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except ValueError:
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print("ValueError")
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# invalid assignment on RHS
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try:
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memoryview(array.array('i'))[0:2] = b'1234'
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except ValueError:
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print('ValueError')
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