Is there some function which will tell me how many bytes does a string occupy in memory?
是否有一些函数可以告诉我字符串在内存中占用多少字节？
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。
2 个解决方案
#1
57
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的代表长度，所以像len（s）这样的东西就足够了。
#2
61
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 len of 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（'utf-8'是一个不错的选择）编码为字节（或str），然后获取len编码的bytes / str对象。
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:
而中国人每人使用3个字节：
>>> len("你好".encode("utf8"))
6
#1
57
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的代表长度，所以像len（s）这样的东西就足够了。
#2
61
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 len of 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（'utf-8'是一个不错的选择）编码为字节（或str），然后获取len编码的bytes / str对象。
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:
而中国人每人使用3个字节：
>>> len("你好".encode("utf8"))
6