python将有符号整数转为无符号整数

方法一、int.from_bytes(v.to_bytes)

# 将占1字节的小端有符号数-43转换成无符号数小端整数213
int.from_bytes((-43).to_bytes(1, 'little', signed=True), 'little', signed=False)
# 213

'''
to_bytes(length, byteorder, *, signed=False) method of builtins.int instanceReturn an array of bytes representing an integer.lengthLength of bytes object to use.  An OverflowError is raised if theinteger is not representable with the given number of bytes.  # 字节长度byteorderThe byte order used to represent the integer.  If byteorder is 'big',the most significant byte is at the beginning of the byte array.  Ifbyteorder is 'little', the most significant byte is at the end of thebyte array.  To request the native byte order of the host system, use`sys.byteorder' as the byte order value.  # 大小端signedDetermines whether two's complement is used to represent the integer.If signed is False and a negative integer is given, an OverflowErroris raised.  # 是否是符号数''''''from_bytes(bytes, byteorder, *, signed=False) method of builtins.type instanceReturn the integer represented by the given array of bytes.bytesHolds the array of bytes to convert.  The argument must eithersupport the buffer protocol or be an iterable object producing bytes.Bytes and bytearray are examples of built-in objects that support thebuffer protocol.byteorderThe byte order used to represent the integer.  If byteorder is 'big',the most significant byte is at the beginning of the byte array.  Ifbyteorder is 'little', the most significant byte is at the end of thebyte array.  To request the native byte order of the host system, use`sys.byteorder' as the byte order value.signedIndicates whether two's complement is used to represent the integer.'''

方法二、使用struct类库

>>> import struct
>>> struct.unpack('<B', struct.pack('<b', -43))
(213,)
# 返回的是一个元祖

第一个参数是fmt,可选项如下
DESCRIPTION
Functions to convert between Python values and C structs.
Python bytes objects are used to hold the data representing the C struct
and also as format strings (explained below) to describe the layout of data
in the C struct.

The optional first format char indicates byte order, size and alignment:@: native order, size & alignment (default)=: native order, std. size & alignment<: little-endian, std. size & alignment>: big-endian, std. size & alignment!: same as >The remaining chars indicate types of args and must match exactly;
these can be preceded by a decimal repeat count:x: pad byte (no data); c:char; b:signed byte; B:unsigned byte;?: _Bool (requires C99; if not available, char is used instead)h:short; H:unsigned short; i:int; I:unsigned int;l:long; L:unsigned long; f:float; d:double; e:half-float.
Special cases (preceding decimal count indicates length):s:string (array of char); p: pascal string (with count byte).
Special cases (only available in native format):n:ssize_t; N:size_t;P:an integer type that is wide enough to hold a pointer.
Special case (not in native mode unless 'long long' in platform C):q:long long; Q:unsigned long long
Whitespace between formats is ignored.The variable struct.error is an exception raised on errors.

方法三、&操作

位操作，根据所占字节数

>>> -43 & 255
213
>>> -43 & 0xff
213
-43 & 0xffff
65493

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python将有符号整数转为无符号整数

方法一、int.from_bytes(v.to_bytes)

方法二、使用struct类库

方法三、&操作

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