How can I get the named parameters from a URL using Flask

Question

When the user accesses this URL running on my flask app  I want the web service to be able to handle the parameters specified after the question mark   http   10 1 1 1 5000 login username alex amp password pw1   I just want to be able to manipulate the parameters  app route   login   methods   GET    POST    def login        username   request form  username       print username      password   request form  password       print password

User · Answer

Use request args get param   for example   http   10 1 1 1 5000 login username alex amp password pw1    app route   login   methods   GET    POST    def login        username   request args get  username       print username      password   request args get  password       print password    Here is the referenced link to the code

User · Answer

It s really simple  Let me divide this process into two simple steps   On the html template you will declare name attribute for username and password like this    lt form method  quot POST quot  gt   lt input type  quot text quot  name  quot user name quot  gt  lt  input gt   lt input type  quot text quot  name  quot password quot  gt  lt  input gt   lt  form gt    Then  modify your code like this   from flask import request   app route   my-route   methods   POST      you should always parse username and    password in a POST method not GET def my route        username   request form get  quot user name quot       print username      password   request form get  quot password quot       print password       now manipulate the username and password variables as you wish      Tip  define another method instead of methods   GET   POST    if you want to         render the same template with a GET request too

User · Answer

Template Code  lt table gt        lt tr gt         lt th style  quot min-width  70px  quot  gt Sl No  lt  th gt         lt th style  quot min-width  350px  quot  gt Description lt  th gt         lt th style  quot min-width  100px  quot  gt Date lt  th gt         lt th style  quot min-width  50px  quot  gt Time lt  th gt         lt th style  quot min-width  50px  quot  gt Status lt  th gt         lt th style  quot min-width  50px  quot  gt Action lt  th gt         lt  tr gt           set count    0              for val in data  todos              if count append count pop     1       endif           lt tr gt         lt td gt   count 0    lt  td gt         lt td gt   val  description     lt  td gt         lt td gt   val  date     lt  td gt         lt td gt   val  time     lt  td gt         lt td gt   val  status     lt  td gt         lt td gt           lt a class  quot fa fa-edit quot  href  quot   quot  style  quot  color  rgb 32  252  43   quot   gt  lt  a gt           lt a class  quot fa fa-trash-alt quot  href  quot http   localhost 5000 delete todoid   val   id     quot  onmouseout  quot this style color   rgb 248  153  153   quot  onmouseover  quot this style color  rgb 241  74  74   quot  style  quot padding-left 8   color  rgb 248  153  153   quot  gt  lt  a gt         lt  td gt        lt  tr gt          endfor         lt  table gt   Route code  app route   delete   methods   quot GET quot    def deleteTodo    id   request args get  todoid   print id

User · Answer

The URL parameters are available in request args  which is an ImmutableMultiDict that has a get method  with optional parameters for default value  default  and type  type  - which is a callable that converts the input value to the desired format   See the documentation of the method for more details    from flask import request   app route   my-route   def my route      page   request args get  page   default   1  type   int    filter   request args get  filter   default        type   str    Examples with the code above    my-route page 34               - gt  page  34  filter       my-route                       - gt  page   1  filter       my-route page 10 amp filter test   - gt  page  10  filter   test   my-route page 10 amp filter 10     - gt  page  10  filter   10   my-route page   amp filter         - gt  page   1  filter

User · Answer

You can also use brackets  lt   on the URL of the view definition and this input will go into your view function arguments   app route    lt name gt    def my view func name       return name

User · Answer

Use request args to get parsed contents of query string   from flask import request   app route      def login        username   request args get  username       password   request args get  password

User · Answer

If you have a single argument passed in the URL you can do it as follows  from flask import request  url http   10 1 1 1 5000 login alex  from flask import request  app route   login  lt username gt    methods   GET    def login username       print username    In case you have multiple parameters    url http   10 1 1 1 5000 login username alex amp password pw1  from flask import request  app route   login   methods   GET        def login            username   request args get  username           print username          password  request args get  password           print password    What you were trying to do works in case of POST requests where parameters are passed as form parameters and do not appear in the URL  In case you are actually developing a login API  it is advisable you use POST request rather than GET and expose the data to the user   In case of post request  it would work as follows    url http   10 1 1 1 5000 login   HTML snippet    lt form action  http   10 1 1 1 5000 login  method  POST  gt    Username    lt input type  text  name  username  gt  lt br gt    Password    lt input type  password  name  password  gt  lt br gt     lt input type  submit  value  submit  gt   lt  form gt    Route   from flask import request  app route   login   methods   POST        def login            username   request form get  username           print username          password  request form get  password           print password

User · Answer

url    http   0 0 0 0 5000 user name    code    app route   user  lt string name gt     methods   GET    POST    def user view name       print name     Edit  removed spaces in format string

[python] How can I get the named parameters from a URL using Flask?

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