为什么print结果不是jjj, 而是3呢？

Question

f = open('test1.txt','w+') con = f.write('jjj') print(con) f.close()

Answer 1

输入f.write?可以看到write方法的用法及返回值，通过
Returns the number of characters written (which is always equal to
the length of the string).
可以从看出write方法的返回值是写入字符串的长度，因此结果是3