1、可以在mode參數中添加'b'字符。所有適合文件對象的相同方法。然而,每種方法都希望并返回一個bytes對象。
>>> with open(`dog_breeds.txt`, 'rb') as reader: >>> print(reader.readline()) b'Pug\n'
2、當打開文件并單獨閱讀這些字節時,可以看到它確實是一個png文件:
>>> with open('jack_russell.png', 'rb') as byte_reader: >>> print(byte_reader.read(1)) >>> print(byte_reader.read(3)) >>> print(byte_reader.read(2)) >>> print(byte_reader.read(1)) >>> print(byte_reader.read(1)) b'\x89' b'PNG' b'\r\n' b'\x1a' b'\n'
知識點擴展:
讀取文件的字節流數據,將其轉換為十六進制數據
def read_file(): with open('./flag.zip','rb') as file_byte: file_hex = file_byte.read().hex() print(file_hex) write_file(file_hex) def write_file(file_hex): with open('new.txt','w') as new_file: new_file.write(file_hex) if __name__ == '__main__': read_file()
讀取文件的字節流數據,將其編碼為base64并輸出
import base64 def read_file(): with open('./flag.zip','rb') as file_byte: file_base64 = base64.b64encode(file_byte.read()) print(file_base64) if __name__ == '__main__': read_file()
將十六進制文件轉化為字節流文件寫入
import struct a = open("str.txt","r")#十六進制數據文件 lines = a.read() res = [lines[i:i+2] for i in range(0,len(lines),2)] with open("xxx.xxx","wb") as f: for i in res: s = struct.pack('B',int(i,16)) f.write(s)
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