from io import StringIO
# StringIO:在内存中读写str
from io import StringIO
f = StringIO()
print(f.write('hello'))
print(f.write(' '))
print(f.write('world!ss'))
# getValue()方法用于获取写入的str
print(f.getvalue())
print('-----------------------1')
# 要读取StringIO,可以用一个str初始化StringIO,然后,像读文件一样读取:
f = StringIO('Hello!\nHi!\nGoodbye!')
while True:
s = f.readline()
if s == '':
break
print(s.strip())
print('-----------------------2')
运行结果:
5
1
8
hello world!ss
-----------------------1
Hello!
Hi!
Goodbye!
-----------------------2
from io import BytesIO
# BytesIO
# StringIO操作的只能是str,如果要操作二进制数据,就需要使用BytesIO
from io import BytesIO
f = BytesIO()
print(f.write('中国'.encode('utf-8')))
print(f.getvalue())
# 和StringIO类似,可以用一个bytes初始化BytesIO,然后,像读文件一样读取:
print('-----------------------3')
from io import BytesIO
f = BytesIO(b'\xe4\xb8\xad\xe5\x9b\xbd')
#
# print(f.read())
while True:
s = f.readline()
if s == b'':
break
print(s.strip())
print('-----------------------2')
运行结果:
6
b'\xe4\xb8\xad\xe5\x9b\xbd'
-----------------------3
b'\xe4\xb8\xad\xe5\x9b\xbd'
-----------------------2