python数据类型、编码类型的转化

misc

发布时间 : 2023-10-12 20:45

字数:412 阅读 :

str和bytes
int和bytes
进制和ascii

str和bytes

>>> str_ = "PK\x03\x04"
>>> str_.encode()
b'PK\x03\x04'

>>> bytes_ = b'PK\x03\x04'
>>> bytes_.decode()
'PK\x03\x04'

>>> str_ = "504B0304"
>>> bytes.fromhex(str_)
b'PK\x03\x04'

>>> bytes_ = b'PK\x03\x04'
>>> bytes_.hex()
"504b0304"

举例：以hex形式，读取文件和写入文件

with open('1.txt', 'rb') as f:
    str_ = f.read().hex()

# str_ = "504B0304"
str_1 = ""
for i in range(0, len(str_), 2):
    str_1 += str_[i:i+2]

with open('2.txt', 'wb') as f:
    f.write(bytes.fromhex(str_1))

int和bytes

>>> bytes_ = b"flag{}"
>>> int.from_bytes(bytes_, 'big')
112615676672893

>>> int_ = 112615676672893
>>> int_.to_bytes(10, 'big')
b'\x00\x00\x00\x00flag{}'

>>> from Crypto.Util.number import *
 
>>> bytes_ = b"flag{}"
>>> bytes_to_long(bytes_)
112615676672893

>>> int_ = 112615676672893
>>> long_to_bytes(int_)
b'flag{}'

>>> bytes_ = b"flag{}"
>>> list(bytes_)
[102, 108, 97, 103, 123, 125]

>>> list_ = [102, 108, 97, 103, 123, 125]
>>> bytes(list_)
b'flag{}'

进制和ascii

>>> 0b1100001
97
>>> 0o12
97
>>> 0xa
97

>>> int("0b1100001", 2)
97
>>> int("0o141", 8)
97
>>> int("0x61", 16)
97

>>> int("1100001", 2)
97
>>> int("141", 8)
97
>>> int("61", 16)
97

>>> bin(97)
'0b1100001'
>>> oct(97)
'0o141'
>>> hex(97)
'0x61'

>>> bin(97)[2:]
'1100001'
>>> oct(97)[2:]
'141'
>>> hex(97)[2:]
'61'

>>> ord("a")
97

>>> chr(97)
'a'

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