Python StringIO及BytesIO包使用方法解析

from io import StringIO

f = StringIO()
f.write(‘12345‘)
print(f.getvalue())

f.write(‘54321‘)
f.write(‘abcde‘)

print(f.getvalue())

#打印结果
12345
1234554321abcde

f = StringIO(‘hello\nworld!‘)
while True:
  s = f.readline()
  if s == ‘‘:
    break
  print(s.strip()) #去除\n
#打印结果
hello
world!

from io import BytesIO

f = BytesIO()
f.write(‘保存中文‘.encode(‘utf-8‘))

print(f.getvalue())
#打印结果
b‘\xe4\xbf\x9d\xe5\xad\x98\xe4\xb8\xad\xe6\x96\x87‘

f = BytesIO()

image_open = open(‘./1.jpg‘, ‘rb‘)
f.write(image_open.read())

image_save = open(‘./2.jpg‘, ‘wb‘)
image_save.write(f.getvalue())