Python 一个字符串有多少个字节
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How many bytes does a string have
提问by Richard Knop
Is there some function which will tell me how many bytes does a string occupy in memory?
有什么函数可以告诉我一个字符串在内存中占用了多少字节？
I need to set a size of a socket buffer in order to transfer the whole string at once.
我需要设置套接字缓冲区的大小以便一次传输整个字符串。
采纳答案by eumiro
import sys
sys.getsizeof(s)
# getsizeof(object, default) -> int
# Return the size of object in bytes.
But actually you need to know its represented length, so something like len(s)should be enough.
但实际上你需要知道它代表的长度，所以像这样len(s)应该就足够了。
回答by tzot
If it's a Python 2.x str, get its len. If it's a Python 3.x str(or a Python 2.x unicode), first encode to bytes(or a str, respectively) using your preferred encoding ('utf-8'is a good choice) and then get the lenof the encoded bytes/str object.
如果它是 Python 2.x str，请获取它的len. 如果它是 Python 3.x str（或 Python 2.x unicode），首先使用您的首选编码（bytes或str分别'utf-8'为 a ）编码（是一个不错的选择），然后获取len编码的 bytes/str 对象的 。
For example, ASCII characters use 1 byte each:
例如，ASCII 字符每个使用 1 个字节：
>>> len("hello".encode("utf8"))
5
whereas Chinese ones use 3 bytes each:
而中文每个使用 3 个字节：
>>> len("你好".encode("utf8"))
6
