Python - Download File Using Requests, Directly to Memory

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The goal is to download a file from the internet, and create from it a file object, or a file like object without ever having it touch the hard drive. This is just for my knowledge, wanting to know if its possible or practical, particularly because I would like to see if I can circumvent having to code a file deletion line.

This is how I would normally download something from the web, and map it to memory:

import requests
import mmap

u = requests.get("http://www.pythonchallenge.com/pc/def/channel.zip")

with open("channel.zip", "wb") as f: # I want to eliminate this, as this writes to disk
    f.write(u.content)

with open("channel.zip", "r+b") as f: # and his as well, because it reads from disk
    mm = mmap.mmap(f.fileno(), 0)
    mm.seek(0)
    print mm.readline()
    mm.close() # question: if I do not include this, does this become a memory leak?

r.raw (HTTPResponse) is already a file-like object (just pass stream=True):

#!/usr/bin/env python
import sys
import requests # $ pip install requests
from PIL import Image # $ pip install pillow

url = sys.argv[1]
r = requests.get(url, stream=True)
r.raw.decode_content = True # Content-Encoding
im = Image.open(r.raw) #NOTE: it requires pillow 2.8+
print(im.format, im.mode, im.size)

In general if you have a bytestring; you could wrap it as f = io.BytesIO(r.content), to get a file-like object without touching the disk:

#!/usr/bin/env python
import io
import zipfile
from contextlib import closing
import requests # $ pip install requests

r = requests.get("http://www.pythonchallenge.com/pc/def/channel.zip")
with closing(r), zipfile.ZipFile(io.BytesIO(r.content)) as archive:
    print({member.filename: archive.read(member) for member in archive.infolist()})

You can't pass r.raw to ZipFile() directly because the former is a non-seekable file.

I would like to see if I can circumvent having to code a file deletion line

tempfile can delete files automatically f = tempfile.SpooledTemporaryFile(); f.write(u.content). Until .fileno() method is called (if some api requires a real file) or maxsize is reached; the data is kept in memory. Even if the data is written on disk; the file is deleted as soon as it closed.

How to download files with Python, Note that requests.get will download the file immediately and store it in memory. For larger files, this does not work as they might not fit in� Requests is a versatile HTTP library in python with various applications.One of its applications is to download a file from web using the file URL. Installation: First of all, you would need to download the requests library.

Your answer is u.content. The content is in the memory. Unless you write it to a file, it won’t be stored on disk.

Python: Using the `requests` module to download large files efficiently, If we set stream to False , all the content is downloaded immediately and put into memory. If the file size is large, this can soon cause issues with� First, we use the get method of the requests module as we did before, but this time we will set the stream attribute to True. Then we create a file named PythonBook.pdf in the current working directory and open it for writing. Then we specify the chunk size that we want to download at a time. We have set to 1024 bytes.

This is what I ended up doing.

import zipfile 
import requests
import StringIO

u = requests.get("http://www.pythonchallenge.com/pc/def/channel.zip")
f = StringIO.StringIO() 
f.write(u.content)

def extract_zip(input_zip):
    input_zip = zipfile.ZipFile(input_zip)
    return {i: input_zip.read(i) for i in input_zip.namelist()}
extracted = extract_zip(f)

Downloading Files from URLs in Python, I will write about methods to correctly download binaries from URLs Let's start with baby steps on how to download a file using requests -- In Python3 can use io.BytesIO together with zipfile (both are present in the standard library) to read it in memory. The following example function provides a ready-to-use generator based approach on iterating over the files in the ZIP: downloading-reading-a-zip-file-in-memory-using-python.py 📋 Copy to clipboard ⇓ Download

How to download files using Python | by Aaron S, How to download files that redirect using the request package. we can use an open function which is boilerplate straight out of python's built-in functions. This method stops the whole file in being in the memory (cache). I like the answers from The Aelfinn and aheld.I can improve them only by shortening a bit more, removing superfluous pieces, using a real data source, making it 2.x & 3.x-compatible, and maintaining the high-level of memory-efficiency seen elsewhere:

Downloading & reading a ZIP file in memory using Python , Downloading & reading a ZIP file in memory using Python URL in Python, but you don't want to store it in a temporary file and extract it later but instead directly extract its contents in memory. response = requests.get(url). urllib2.urlopen('url_to_file') requests.get(url) wget.download('url', file_name) Note: urlopen and urlretrieve are found to perform relatively bad with downloading large files (size > 500 MB). requests.get stores the file in-memory until download is complete.

Downloading files from web using Python, 29-11-2016. Requests is a versatile HTTP library in python with various applications. One of its applications is to download a file from web using the file URL. You can directly install it using pip by typing following command: This avoids reading the content all at once into memory for large responses. If you use Python regularly, you might have come across the wonderful requests library. I use it almost everyday to read urls or make POST requests. In this post, we shall see how we can download a large file using the requests module with low memory consumption.

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