Getting started with python-requests

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Remarks

HTTP for Humans

Requests is the only Non-GMO HTTP library for Python, safe for human consumption.

Requests allows you to send organic, grass-fed HTTP/1.1 requests, without the need for manual labor. There's no need to manually add query strings to your URLs, or to form-encode your POST data. Keep-alive and HTTP connection pooling are 100% automatic, powered by urllib3, which is embedded within Requests.

The power of Requests:

>>> r = requests.get('https://api.github.com/user', auth=('user', 'pass'))
>>> r.status_code
200
>>> r.headers['content-type']
'application/json; charset=utf8'
>>> r.encoding
'utf-8'
>>> r.text
u'{"type":"User"...'
>>> r.json()
{u'private_gists': 419, u'total_private_repos': 77, ...}

Reading the response

response = requests.get("https://api.github.com/events")
text_resp = response.text
 

JSON response: for json-formatted responses the package provides a built-in decoder

response = requests.get('https://api.github.com/events')
json_resp = response.json()
 

This method will raise a ValueError in case of empty response or unparseable content.

GET requests

requests.get() creates a GET request:

response = requests.get('https://example.com/')
 

Pass in query parameters as a dictionary to the params argument:

response = requests.get('https://example.com/', params={"a": 1, "b": 2})
 

For GET requests that might require basic authentication, you can include the auth paramter as follows:

response = requests.get('https://api.github.com/user', auth=('user', 'pass'))
 

Installation or Setup

python-requests is available on PyPI, the Python Package Index, which means it can be installed through pip:

pip install requests
 

Up-to-date source code can be found on the requests GitHub repository

If you wish to install it from source, you can do this by either cloning the GitHub repository:

git clone git://github.com/kennethreitz/requests.git
 

Or by getting the tarball (-O writes the output to file; -L follows redirects):

curl -OL https://github.com/kennethreitz/requests/tarball/master
 

Then you can install it by executing the setup.py

python setup.py install
 

However you installed it, you can start using it by importing the usual way

>>> import requests
>>> requests.get('http://stackoverflow.com')
 

Other request methods

The requests module has top-level functions for most HTTP methods:

r = requests.put('https://example.com/', data=put_body)
r = requests.delete('https://example.com/')
r = requests.head('https://example.com/')
r = requests.options('https://example.com/')
r = requests.patch('https://example.com/', data=patch_update)
 

POST requests

POST requests are made with the request.post() method.

If you need to send a web form request as a POST body, pass in a dictionary with key-value pairs as the data argument; requests will encode these to a application/x-www-form-urlencoded mimetype body:

r = requests.post('https://github.com/', data={"a": 1, "b": 2})
 

If you need to POST a json payload, you can use json= . This will automatically set the Content-Type header to application/json

r = requests.post('https://github.com/', data={"a": 1, "b": 2})
 

Reading status codes

The attribute status_code contains the status code of the response

good_req = requests.get('https://api.github.com/events')
code_200 = good_req.status_code

notfound_req = requests.get('https://api.github.com/not_found')
code_404 = notfound_req.status_code
 

requests.codes.__dict__ will provide a list of available http status codes.

It is possible to user raise_for_status to check if the status_code was 4xx or 5xx and raise a corresponding exception in that case.

good_req = requests.get('https://api.github.com/events')
good_req.raise_for_status()
# is a 200 status code so nothing happens

notfound_req = requests.get('https://api.github.com/not_found')
notfound_req.raise_for_status()
# raises requests.exceptions.HTTPError: 404 Client Error
 

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169 Contributors: 12
Thursday, November 24, 2016
Licensed under: CC-BY-SA

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