# file.read([size]) # Read at most size bytes from the file (less if the read hits EOF before obtaining size bytes). # If the size argument is negative or omitted, read all data until EOF is reached. # The bytes are returned as a string object. # An empty string is returned whe...
def readStrFromFile(filePath): """ 从文件中读取字符串str param filePath: 文件路径 return string : 文本字符串 """ with open(filePath, "rb") as f: string = f.read() return string 1. 2. 3. 4. 5. 6. 7. 8. 9. b'\xe4\xbd\xa0\xe5\xa5\xbd' 1. bytes_all = file.read(...
四、文件中的内容定位f.read() 读取之后,文件指针到达文件的末尾,如果再来一次f.read()将会发现读取的是空内容,如果想再次读取全部内容,必须将定位指针移动到文件开始: f.seek(0) 这个函数的格式如下(单位是bytes): f.seek(offset, from_what) from_what表示开始读取的位置,offset表示从from_what再移动一定量...
模式:rb,read,binary,写入内容必须是bytes类型;rt:read,text,写入字符串类型。 判断文件是否存在:os.path.exists(r'c:\new\file.txt') f = open('file.txt', mode='rb') f = open('file.txt', mode='rt', encoding='utf-8') f.read() f.close() 实质上文件本身内容都是二进制形式,文本文件、...
fromioimportStringIO f = StringIO("Hello\nHi\nGoodBye!")whileTrue: s = f.readline()ifs =='':break# 去掉换行符print(s.strip()) 输出: Hello Hi GoodBye! 6、BytesIO StringIO操作的只能是str,如果要操作二进制数据,就需要使用BytesIO。
read() print(f"Binary content of image.png read. Length: {len(binary_content)} bytes.") # Step 5: 逐行读取文件并转换为大写 print("\nStep 5: Reading lines one by one and converting to uppercase.") with open('example.txt', 'r', encoding='utf-8') as file: line = file.readline...
In [29]: help(file.read) Help on method_descriptor: read(...) read([size]) -> read at most size bytes, returned as a string. If the size argument is negative or omitted, read until EOF is reached. Notice that when in non-blocking mode, less data than what was requested may be...
Path.write_bytes(): 以二进制/字节模式打开路径并向其写入数据。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 >>>p=Path('my_binary_file')>>>p.write_bytes(b'Binary file contents')20>>>p.read_bytes()b'Binary file contents'>>>p=Path('my_text_file')>>>p.write_text('Text file...
data = ser.read_all() if data: rec_str = data.decode('utf-8') print(rec_str) 这里我创建了两个虚拟的串口进行模拟,COM2向COM1发送了两次hello world,而Python端实现了COM1,监听来自COM2的消息,用read_all()方法读取接收到的数据,接收到的数据类型是bytes类型的,因此我们需要将bytes数组转成字符串pr...
Path.read_bytes(): 以二进制/字节模式打开路径并以字节串的形式返回内容。 Path.write_text(): 打开路径并向其写入字符串数据。 Path.write_bytes(): 以二进制/字节模式打开路径并向其写入数据。 >>> p = Path('my_binary_file') >>> p.write_bytes(b'Binary file contents') ...