from array import array
"""
’b’
signed char
int
1
’B’
unsigned char
int
1
’u’
Py_UNICODE
Unicode character
2
(1)
’h’
signed short
int
2
’H’
unsigned short
int
2
’i’
signed int
int
2
’I’
unsigned int
int
2
’l’
signed long
int
4
’L’
unsigned long
int
4
’q’
signed long long
int
8
(2)
’Q’
unsigned long long
int
8
(2)
’f’
float
float
4
’d’
double
float
8
"""
buffer = array('l') # 创建有符号类型到整数数组 L是无符号类型的整型，无符号表示正整数包括0，有符号是正负整数和0
buffer.append(127)
buffer.append(10) # 追加元素到末尾
print(buffer.count(10))
buffer.extend([4, 2]) # 扩展数组
buffer.fromlist([21, 4, 12, -128, 0]) # 从列表添加元素，与extend效果一样
print(buffer)
buffer.pop() # 移除最后一个元素
print(buffer)
print('buffer_info->', buffer.buffer_info())
# print(buffer.byteswap())
print('itemsize->', buffer.itemsize)
print('tostring->', buffer.tostring())
print('tobytes->', buffer.tobytes())
print('tolist->', buffer.tolist())
f = open('test.txt', 'wb')
print('tofile->',buffer.tofile(f))
print('typecode->', buffer.typecode)
#
#
buffer = array('f') # 创建浮点类型数组，对于整数会自动转为浮点数
buffer.append(127)
buffer.append(10) # 追加元素到末尾
print(buffer.count(10))
buffer.extend([4, 2]) # 扩展数组
buffer.fromlist([21, 4, 12, -128, 0]) # 从列表添加元素，与extend效果一样
print(buffer)
buffer.pop() # 移除最后一个元素
print(buffer)
print('buffer_info->', buffer.buffer_info())
# print(buffer.byteswap())
print('itemsize->', buffer.itemsize)
print('tostring->', buffer.tostring())
print('tobytes->', buffer.tobytes())
print('tolist->', buffer.tolist())
f = open('test.txt', 'wb')
print('tofile->',buffer.tofile(f))
print('typecode->', buffer.typecode)
buffer = array('b') # 创建字符型的的整型数组，该元素范围为-128～127之间，对应的是
buffer.append(127)
buffer.append(10) # 追加元素到末尾
print(buffer.count(10))
buffer.extend([4, 2]) # 扩展数组
buffer.fromlist([21, 4, 12, -128, 0]) # 从列表添加元素，与extend效果一样
buffer.frombytes(b'hello world')
print(buffer)
buffer.pop() # 移除最后一个元素
print(buffer)
print('buffer_info->', buffer.buffer_info())
# print(buffer.byteswap())
print('itemsize->', buffer.itemsize)
print('tostring->', buffer.tostring())
print('tobytes->', buffer.tobytes())
print('tolist->', buffer.tolist())
f = open('test.txt', 'wb')
print('tofile->',buffer.tofile(f))
print('typecode->', buffer.typecode)
buffer = array('B') # 创建字符型的的整型数组，该元素范围为0～255之间，对应的是ascii表的十进制数
buffer.append(127)
buffer.append(10) # 追加元素到末尾
print(buffer.count(10))
buffer.extend([4, 2]) # 扩展数组
buffer.fromlist([21, 4, 12, 255, 0]) # 从列表添加元素，与extend效果一样
buffer.frombytes(b'hello worlded')
# buffer.append(100)
print(buffer)
buffer.pop() # 移除最后一个元素
print(buffer)
print('buffer_info->', buffer.buffer_info())
# print(buffer.byteswap())
print('itemsize->', buffer.itemsize)
print('tostring->', buffer.tostring().decode('Latin-1')) # 对于含有特殊指令符的数据只能用这种编码解码，普通的字符可以使用默认的utf-8解码
print('tobytes->', buffer.tobytes())
print('tolist->', buffer.tolist())
f = open('test.txt', 'wb')
print('tofile->',buffer.tofile(f)) # 写入文件
print('typecode->', buffer.typecode)
"""
1
array('l', [127, 10, 4, 2, 21, 4, 12, -128, 0])
array('l', [127, 10, 4, 2, 21, 4, 12, -128])
buffer_info-> (4334510800, 8)
itemsize-> 8
tostring-> b'x7fx00x00x00x00x00x00x00
x00x00x00x00x00x00x00x04x00x00x00x00x00x00x00x02x00x00x00x00x00x00x00x15x00x00x00x00x00x00x00x04x00x00x00x00x00x00x00x0cx00x00x00x00x00x00x00x80xffxffxffxffxffxffxff'
tobytes-> b'x7fx00x00x00x00x00x00x00
x00x00x00x00x00x00x00x04x00x00x00x00x00x00x00x02x00x00x00x00x00x00x00x15x00x00x00x00x00x00x00x04x00x00x00x00x00x00x00x0cx00x00x00x00x00x00x00x80xffxffxffxffxffxffxff'
tolist-> [127, 10, 4, 2, 21, 4, 12, -128]
tofile-> None
typecode-> l
1
array('f', [127.0, 10.0, 4.0, 2.0, 21.0, 4.0, 12.0, -128.0, 0.0])
array('f', [127.0, 10.0, 4.0, 2.0, 21.0, 4.0, 12.0, -128.0])
buffer_info-> (4334315536, 8)
itemsize-> 4
tostring-> b'x00x00xfeBx00x00 Ax00x00x80@x00x00x00@x00x00xa8Ax00x00x80@x00x00@Ax00x00x00xc3'
tobytes-> b'x00x00xfeBx00x00 Ax00x00x80@x00x00x00@x00x00xa8Ax00x00x80@x00x00@Ax00x00x00xc3'
tolist-> [127.0, 10.0, 4.0, 2.0, 21.0, 4.0, 12.0, -128.0]
tofile-> None
typecode-> f
1
array('b', [127, 10, 4, 2, 21, 4, 12, -128, 0, 104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100])
array('b', [127, 10, 4, 2, 21, 4, 12, -128, 0, 104, 101, 108, 108, 111, 32, 119, 111, 114, 108])
buffer_info-> (4334041264, 19)
itemsize-> 1
tostring-> b'x7f
x04x02x15x04x0cx80x00hello worl'
tobytes-> b'x7f
x04x02x15x04x0cx80x00hello worl'
tolist-> [127, 10, 4, 2, 21, 4, 12, -128, 0, 104, 101, 108, 108, 111, 32, 119, 111, 114, 108]
tofile-> None
typecode-> b
1
array('B', [127, 10, 4, 2, 21, 4, 12, 255, 0, 104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100, 101, 100])
array('B', [127, 10, 4, 2, 21, 4, 12, 255, 0, 104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100, 101])
buffer_info-> (4334041264, 21)
itemsize-> 1
tostring->
ÿ�hello worlde
tobytes-> b'x7f
x04x02x15x04x0cxffx00hello worlde'
tolist-> [127, 10, 4, 2, 21, 4, 12, 255, 0, 104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100, 101]
tofile-> None
typecode-> B
"""