将字节字符串转换为整数列表的Python程序
给定一个字节字符串。任务是编写一个Python程序来将这个字节的字符串转换为一个整数列表。
方法一：使用list()函数
list()函数用于从作为其参数的指定可迭代对象创建列表。
Syntax:
list([iterable])
Parameters: This function accepts a single parameter that is illustrated below:
- iterable: This is the specified sequence that is going to be created as another list.
Return values: This function returns a new list created out of the given iterable passed as its arguments.
示例： Python程序将一个字节字符串为一个整数列表
Python3
# Python program to illustrate the
# conversion of a byte string
# to a list of integers
# Initializing a byte string as GFG
x = b'GFG'
# Calling the list() function to
# create a new list of integers that
# are the ascii values of the byte
# string GFG
print(list(x))Python3
# Python program to illustrate the
# conversion of a byte string
# to a list of integers
# Initializing a byte string
S = "GFG is a CS Portal"
nums = []
# Calling the for loop to iterate each
# characters of the given byte string
for chr in S:
# Calling the ord() function
# to convert the specified byte
# characters to numbers of the unicode
nums.append(ord(chr))
# Printing the unicode of the byte string
print(nums)Python3
# Python program to illustrate the
# conversion of a byte string
# to a list of integers
# Initializing byte value
byte_val = b'\x00\x01'
# Converting to int
# byteorder is big where MSB is at start
int_val = int.from_bytes(byte_val, "big")
# Printing int equivalent
print(int_val)Python3
# Python program to illustrate the
# conversion of a byte string
# to a list of integers
# Initializing a byte string
byte_val = b'\xfc\x00'
# 2's complement is enabled in big
# endian byte order format
int_val = int.from_bytes(byte_val, "big", signed="True")
# Printing int object
print(int_val)输出：
[71, 70, 71]方法二：使用for循环和ord()函数
ord()函数用于返回表示指定字节字符的 Unicode 代码的数字。
Syntax:
ord(character)
Parameters: This function accepts a single parameter which is illustrated below:
- character: This is the specified byte string.
Return values: This function returns the number representing the Unicode code of a specified byte character.
示例： Python程序将一个字节字符串为一个整数列表
蟒蛇3
# Python program to illustrate the
# conversion of a byte string
# to a list of integers
# Initializing a byte string
S = "GFG is a CS Portal"
nums = []
# Calling the for loop to iterate each
# characters of the given byte string
for chr in S:
# Calling the ord() function
# to convert the specified byte
# characters to numbers of the unicode
nums.append(ord(chr))
# Printing the unicode of the byte string
print(nums)
输出：
[71, 70, 71, 32, 105, 115, 32, 97, 32, 67, 83, 32, 80, 111, 114, 116, 97, 108]
方法 3：通过使用 from_bytes()函数
from_bytes()函数用于将指定的字节字符串转换为其对应的 int 值。
Syntax:
int.from_bytes(bytes, byteorder, *, signed=False)
Parameters: This function accepts some parameters which are illustrated below:
- bytes: A byte object
- byteorder: This parameter determines the order of representation of the integer value. byteorder can have values as either “little” where most significant bit is stored at the end and least at the beginning, or big, where MSB is stored at start and LSB at the end. Big byte order calculates the value of an integer in base 256.
- signed: Its default value is False. This parameter Indicates whether to represent 2’s complement of a number.
Return values: This function returns an int equivalent to the given byte.
示例： Python程序将一个字节字符串为一个整数列表
蟒蛇3
# Python program to illustrate the
# conversion of a byte string
# to a list of integers
# Initializing byte value
byte_val = b'\x00\x01'
# Converting to int
# byteorder is big where MSB is at start
int_val = int.from_bytes(byte_val, "big")
# Printing int equivalent
print(int_val)
输出：
1示例 2： Python程序将一个字节字符串为一个整数列表
蟒蛇3
# Python program to illustrate the
# conversion of a byte string
# to a list of integers
# Initializing a byte string
byte_val = b'\xfc\x00'
# 2's complement is enabled in big
# endian byte order format
int_val = int.from_bytes(byte_val, "big", signed="True")
# Printing int object
print(int_val)
输出：
-1024