In Flask What is request args and how is it used

Question

I m new in Flask  I can t understand how request args is used  I read somewhere that it is used to return values of query string correct me if I m wrong   And how many parameters request args get   takes  I know that when I have to store submitted form data  I can use  fname   request form get  firstname     Here  only one parameter is passed   Consider this code  Pagination has also been done in this code    app route      def home        cnx   db connect       cur   cnx cursor       output           page   request args get  page   1       try          page   int page          skip    page-1  4     except          abort 404       stmt select    select   from posts limit  s  4       values  skip       cur execute stmt select values      x cur fetchall        for row in reversed x           data                 uid  row 0               pid  row 1               subject  row 2               post content  row 3               date  datetime fromtimestamp row 4                      output append data       next   page   1     previous   page-1     if previous lt 1      previous 1     return render template  home html   persons output  next next  previous previous    Here  request args get   takes two parameters  Please explain why it takes two parameters and what is the use of it

User · Accepted Answer

According to the flask Request args documents      flask Request args   A MultiDict with the parsed contents of the query string   The part in the URL after the question mark     So the args get   is method get   for MultiDict  whose prototype is as follows   get key  default None  type None      Update  In newer version of flask  v1 0 x and v1 1 x    flask Request args is an ImmutableMultiDict an immutable MultiDict   so the prototype and specific method above is still valid

User · Answer

It has some interesting behaviour in some cases that is good to be aware of   from werkzeug datastructures import MultiDict  d   MultiDict    ex1          ex2   None     d get  ex1    alternive     returns      d get  ex2    alternative     returns no visible output of any kind   It is returning literally None  so if you do  d get  ex2    alternative   is None   it returns  True  d get  ex3    alternative     returns   alternative

User · Answer

request args is a MultiDict with the parsed contents of the query string   From the documentation of get method      get key  default None  type None       Return the default value if the   requested data doesn   t exist  If type is provided and is a callable it   should convert the value  return it or raise a ValueError if that is   not possible

User · Answer

martinho as a newbie using Flask and Python myself  I think the previous answers here took for granted that you had a good understanding of the fundamentals  In case you or other viewers don t know the fundamentals  I ll give more context to understand the answer          the request args is bringing a  dictionary  object for you  The  dictionary  object is similar to other collection-type of objects in Python  in that it can store many elements in one single object   Therefore the answer to your question      And how many parameters request args get   takes    It will take only one object  a  dictionary  type of object  as stated in the previous answers    This  dictionary  object  however  can have as many elements as needed     dictionaries have paired elements called Key  Value    Other collection-type of objects besides  dictionaries   would be  tuple   and  list     you can run a google search on those and  data structures  in order to learn other Python fundamentals  This answer is based Python  I don t have an idea if the same applies to other programming languages

[python] In Flask, What is request.args and how is it used?

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