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| from flask import Flask | |
| from flask_restful import Api, Resource, reqparse | |
| app = Flask(__name__) | |
| api = Api(app) | |
| users = [ | |
| { | |
| "name": "Nicholas", | |
| "age": 42, | |
| "occupation": "Network Engineer" | |
| }, | |
| { | |
| "name": "Elvin", | |
| "age": 32, | |
| "occupation": "Doctor" | |
| }, | |
| { | |
| "name": "Jass", | |
| "age": 22, | |
| "occupation": "Web Developer" | |
| } | |
| ] | |
| class User(Resource): | |
| def get(self, name): | |
| for user in users: | |
| if(name == user["name"]): | |
| return user, 200 | |
| return "User not found", 404 | |
| def post(self, name): | |
| parser = reqparse.RequestParser() | |
| parser.add_argument("age") | |
| parser.add_argument("occupation") | |
| args = parser.parse_args() | |
| for user in users: | |
| if(name == user["name"]): | |
| return "User with name {} already exists".format(name), 400 | |
| user = { | |
| "name": name, | |
| "age": args["age"], | |
| "occupation": args["occupation"] | |
| } | |
| users.append(user) | |
| return user, 201 | |
| def put(self, name): | |
| parser = reqparse.RequestParser() | |
| parser.add_argument("age") | |
| parser.add_argument("occupation") | |
| args = parser.parse_args() | |
| for user in users: | |
| if(name == user["name"]): | |
| user["age"] = args["age"] | |
| user["occupation"] = args["occupation"] | |
| return user, 200 | |
| user = { | |
| "name": name, | |
| "age": args["age"], | |
| "occupation": args["occupation"] | |
| } | |
| users.append(user) | |
| return user, 201 | |
| def delete(self, name): | |
| global users | |
| users = [user for user in users if user["name"] != name] | |
| return "{} is deleted.".format(name), 200 | |
| api.add_resource(User, "/user/<string:name>") | |
| app.run(debug=True) |
I get 404 page not found error, please help me
Is it because you forgot to add the name to your url?
For an example of doing a get request for a user named Nicholas, you will need to write http://127.0.0.1:5000/user/Nicholas instead of just http://127.0.0.1:5000. The need for the name string is specified here:
api.add_resource(User, "/user/<string:name>")
I am getting an exception as shown below. I am using Anaconda with Python 3.6 on windows 10 pro. (I have no issue running this on linux by the way.)
- Restarting with stat
An exception has occurred, use %tb to see the full traceback.
SystemExit: 1
Here is with the %tb:::
%tb
Traceback (most recent call last):
File "", line 1, in
runfile('C:/Users/ctom/Documents/Python Scripts/temp3.py', wdir='C:/Users/ctom/Documents/Python Scripts')
File "C:\Users\ctom\AppData\Local\Continuum\anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 705, in runfile
execfile(filename, namespace)
File "C:\Users\ctom\AppData\Local\Continuum\anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "C:/Users/ctom/Documents/Python Scripts/temp3.py", line 77, in
app.run(debug=True)
File "C:\Users\ctom\AppData\Local\Continuum\anaconda3\lib\site-packages\flask\app.py", line 841, in run
run_simple(host, port, self, **options)
File "C:\Users\ctom\AppData\Local\Continuum\anaconda3\lib\site-packages\werkzeug\serving.py", line 812, in run_simple
reloader_type)
File "C:\Users\ctom\AppData\Local\Continuum\anaconda3\lib\site-packages\werkzeug_reloader.py", line 275, in run_with_reloader
sys.exit(reloader.restart_with_reloader())
SystemExit: 1
code in _reloader.py is generating the system exit in function run_with_reloader. Snippet of code is shown below:::
if os.environ.get('WERKZEUG_RUN_MAIN') == 'true':
t = threading.Thread(target=main_func, args=())
t.setDaemon(True)
t.start()
reloader.run()
else:
sys.exit(reloader.restart_with_reloader())
My environment does not have 'WERKZEUG_RUN_MAIN' as a key though the flask install did not face any issue. So what should have set that key? Does this have to be manually set in windows for anaconda install?
The code actually runs properly with Anaconda when 'debug=True' is removed in app.run(debug=True).
http://127.0.0.1:5000/user/Nicholas
The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.
Why is it taking a GET request. Its nowhere specified in the code to take default GET function
How can we change it to another function(ex:POST)
def post(self, name):
^
IndentationError: expected an indented block
How to solve it
/home/mtech/my_flask_app/venv/bin/python /home/mtech/my_flask_app/api.py
Traceback (most recent call last):
File "/home/mtech/my_flask_app/api.py", line 2, in
from flask_restful import Api, Resource, reqparse
File "/home/mtech/my_flask_app/flask_restful.py", line 2, in
from flask_restful import Resource, Api
ImportError: cannot import name 'Resource'
I installed packages but show this error
please solve it
It will Show
127.0.0.1 - - [05/Feb/2019 18:40:32] "GET / HTTP/1.1" 404 -
127.0.0.1 - - [05/Feb/2019 18:40:40] "GET /user/name HTTP/1.1" 405 -
127.0.0.1 - - [05/Feb/2019 18:40:50] "GET /user/name HTTP/1.1" 405 -
TypeError: get() missing 1 required positional argument: 'name' <- This is what shows upon running 127.0.0.1:5000/user/Aish . Please help.Why am I seeing this message ?
@shivamtomar77 How did you solve the import issue?
I POST a new user, GETting it fails, and PUTting it works somehow, not sure what is going on.
https://gist.github.com/leon-sleepinglion/97bfd34132394e23ca5905ec730f776a?signup=true#gistcomment-2761061
Same problem here, how can i call POST, it just show GET.
Thx
These worked fine for me.....
GET
curl --request GET --url http://127.0.0.1:5000/user/Jass
this returns the JSON object for Jass
POST
curl --request POST --url http://127.0.0.1:5000/user/George
this adds another user named George
Thanks for you help! I successfully use c socket to test it.
https://github.com/JamesChan21/Flask_And_C_Socket
Why is it taking a GET request. Its nowhere specified in the code to take default GET function
How can we change it to another function(ex:POST)
http://127.0.0.1:5000/user/Marvin?age=29
^ That is the way you can do it in the URL.
You can also do it in the following way:
Change from "GET" to PUT.
Click on PARAMS
Under "Key" fill in the attribute of choice (age, occupation, etc.)
Under Value, fill in desired value (for example, 30).
Then, click on SEND.
The following should be displayed in the body:
Why is it taking a GET request. Its nowhere specified in the code to take default GET function
How can we change it to another function(ex:POST)
Note you are calling User class in api.add_resource(User, "/api/user/<string:name>"). As you initialize HTTP call it will make a request for HTTP GET method. See console debug output:
127.0.0.1 - - [20/Nov/2019 17:31:41] "GET /api/user/Jass HTTP/1.1" 200 -
Three ways how to interact with data
Using CURL, you can add new user by using above posted:
curl --request POST --url http://127.0.0.1:5000/api/user/George
You can manipulate the data by using
curl -X PUT -H "Content-Type: application/json" -d '{"age":"23"}' http://127.0.0.1:5000/api/user/George
Notice: I am using different access path with /api/user/
Second way is by using Python's requests module, such as:
import requests
req = requests.get('http://127.0.0.1:5000/api/user/Nicholas')
req.text
req.json()
POST request:
requests.post('http://127.0.0.1:5000/api/user/Mike', data = {'age':57})
The third way is via user interface such as Insomia or Postman
I hope this helps. Good luck!
Hi colleagues. How to run this with parameters from the command line host and port?
Thank u!
Hi colleagues. How to run this with parameters from the command line host and port?
Thank u!
Hi mate, you may use a Python built-in library called argparse to specify command line arguments.
Is there anyway to show a list of users that already exist?
I get 404 page not found error, please help me