struct.pack()
时间: 2024-04-29 18:23:50 浏览: 14
The `struct.pack()` function is a method in Python's `struct` module that is used to convert Python data types into a string of bytes. It takes one or more values as input and returns a string of bytes that can be written to a file or sent over a network.
The `struct.pack()` function is commonly used for binary data serialization and deserialization, especially in network communication protocols and file formats. It allows developers to specify the format of the binary data in a machine-independent way, regardless of the endianness or byte order of the target system.
The syntax of the `struct.pack()` function is as follows:
```
struct.pack(format, v1, v2, ..., vn)
```
where `format` is a string that specifies the format of the binary data, and `v1`, `v2`, ..., `vn` are the values to be packed. The format string consists of one or more format codes that indicate the type and size of the data to be packed. For example, the format code `i` specifies a 4-byte signed integer, while the code `f` specifies a 4-byte floating-point number.
Here's an example usage of the `struct.pack()` function:
```
import struct
data = struct.pack('if', 123, 3.14)
print(data) # b'{\x00\x00\x00\x9a\x99\x99?'
```
In this example, the `struct.pack()` function is used to pack an integer value `123` and a floating-point value `3.14` into a binary string. The format string `'if'` specifies that the first value is an integer (`i`) and the second value is a floating-point number (`f`). The resulting binary string is printed to the console.