Writing bytes to a file in Python
In this tutorial, we will look at how to write bytes to a binary file in Python.
Binary files contain strings of type bytes. When we read a binary file, an object of type bytes is returned. In Python, bytes are represented by hexadecimal numbers. They are prefixed with bthe character, indicating that they are bytes.
Writing bytes to a file in Python
To write bytes to a file, we will first open()create a file object using the file_write_mode function and provide the path to the file. The file should be wbopened in mode, which specifies the write mode for binary files. The following code shows how we write bytes to a file.
data = b"\xC3\xA9"
with open("test.bin", "wb") as f:
f.write(data)
We can also use append mode when we need to add more data to the end of an existing file - afor example
data = b"\xC3\xA9"
with open("test.bin", "ab") as f:
f.write(data)
To write bytes at a specific location, we can use seek()the function, specifying the position of the file pointer to read and write data. For example:
data = b"\xC3\xA9"
with open("test.bin", "wb") as f:
f.seek(2)
f.write(data)
Writing byte arrays to files in Python
We can bytearray()create a byte array using the bytearray function. It returns a mutable bytearray bytearrayobject. We can also convert it to bytes to make it immutable. In the following example, we write a byte array to a file.
arr = bytearray([1, 2, 5])
b_arr = bytes(arr)
with open("test.bin", "wb") as f:
f.write(b_arr)
Writes BytesIOan object to a binary file
ioThe module allows us to extend input and output functions and classes related to file handling. It is used to store bytes and data in chunks in a memory buffer and allows us to handle Unicode data. Here we use the method BytesIOof the class getbuffer()to get a read-write view of the object. See the code below.
from io import BytesIO
bytesio_o = BytesIO(b"\xC3\xA9")
with open("test.bin", "wb") as f:
f.write(bytesio_o.getbuffer())
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