python - What is causing this error and how can I fix it? -

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i trying make simple compression program in python, receiving error

with open("admin.dll", "r").read() text: attributeerror: __exit__

why getting error? full code

import zlib, sys, time, base64 open("admin.txt", "r").read() file:     print("uncompressed: " + str(sys.getsizeof(file)))     compressed = zlib.compress(file, 9)     print("compressed: ", end="")     print(sys.getsizeof(compressed))

you asking python treat result of expression open("admin.dll", "r").read() (a string) context manager. context managers expected have __exit__ method, strings don't have methods.

you'd pass in file object:

with open("admin.dll", "r") fileobj:     text = fileobj.read()

file objects do have required context manager methods.

note have other errors too; sys.getsizeof produces memory size of python object, not size of file. use os.stat() that, or seek end of file , use fileobj.tell() size. size of compressed result, use len().


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