Python IO流的大小

Question

import io
string_out = io.StringIO()
string_out.write("hello")
print(string_out.lenght())

我想知道string_out StringIO的大小。StringIO中有没有支持这一点的方法？

Answer 1

write()的返回值是写入的字符数。

import io
string_out = io.StringIO()
length = string_out.write("hello")
print(length)

Answer 2

StringIO.write返回它所写的内容的计数：

import io
string_out = io.StringIO()
n = string_out.write("hello")
m = string_out.write("helloagain")
print(f'hello is: {n}')
print(f'helloagain is: {m}')

输出：

hello is: 5
helloagain is: 10