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Upload file and read its content in cherrypy python

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  • Last Updated : 05 Sep, 2020
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CherryPy is a web framework of Python which provides a friendly interface to the HTTP protocol for Python developers. It is also called a web application library. It allows developers to build web applications in much the same way they would build any other object-oriented Python program. This results in smaller source code developed in less time.

This framework is mainly for the developers who want to create a portable database-driven web applications using Python, as it provides Create, Retrieve, Update and Delete functionalities.

Prerequisites –

The basic requirements for installation of CherryPy framework include ?

  • Python with version 2.4 or above
  • CherryPy 3.0
  • Installation –
    To install cherrypy run the following command in terminal:

    pip install cherrypy

    A simple Application –

    A cherrypy Application typically looks like this:

    import cherrypy

    class HelloWorld(object):
    @cherrypy.expose
    def index(self):
    return “Hello World!”

    cherrypy.quickstart(HelloWorld())

    Project to Upload file and read its content –

    Steps taken to upload a file and read its content using cherrypy:

    1. Create any text file to read or existing file can also be used. Geeks.txt file is used in the program.
    2. Create user interface that upload a file from system
    3. Write cherrypy program that read the content of file and show its content.
    HTML code that uploads the file from system:




    <html>
    <head>
      <style>
        .container{
          height: 300px;
          width: 600px;
          background-color: maroon;
          margin-top: 12%;
          margin-left: 25%;
          color: white;
        }
        .container h2{
          font-size: 40px;
          text-align: center;  
            
        }
        .off{
          font-size: 25px;
          margin-left: 23%;
          color: yellow;
          background-color: ;
        }
        .on{
          font-size: 25px;
          border-top-right-radius: 25px;
          border-top-left-radius: 25px;
          border-bottom-left-radius: 25px;
          border-bottom-right-radius: 25px;
          margin-top: 20px;   }
      </style>
      </head>
    <body>
      
      <div class="container">  
        <h2><u><i>Upload a file</i></u></h2>
        <form action="store" id="form" method="GET">
        <input class="off" type="file" name="myFile" /><br />
          
        <input style="margin-left: 250px;" class="on" id=" submit" type="submit" /></div>
      </div>    
        </form>
      </div>
                  
    </body>
    </html>

    Read file:




    # import files
    import random
    import string
    import cherrypy
      
    # function to read file content
    def readf(filename):
        file = open(filename)
        read = file.read()
        return read
      
    class Root(object):
         
        @cherrypy.expose
        def index(self):
            return """<html>
    <head>
      <style>
        .container{
          height: 300px;
          width: 600px;
          background-color: maroon;
          margin-top: 12 %;
          margin-left: 25 %;
          color: white;
        }
        .container h2{
          font-size: 40px;
          text-align: center;  
            
        }
        .off{
          font-size: 25px;
          margin-left: 23 %;
          color: yellow;
          background-color: ;
        }
        .on{
          font-size: 25px;
          border-top-right-radius: 25px;
          border-top-left-radius: 25px;
          border-bottom-left-radius: 25px;
          border-bottom-right-radius: 25px;
          margin-top: 20px;   }
          p{ margin-top:100px;
          font-size: 50px;
          color: green}
      </style>
      </head>
    <body>
     <center><p> GEEKSFORGEEKS</p></center>
      <div class ="container">  
        <h2><u><i>Upload a file</i></u></h2>
         
        <form action ="store" id ="form" method ="GET">
        <input class ="off" type ="file" name ="myFile" /><br />   
          
          
        <input style ="margin-left: 250px;" class ="on" id =" submit" type ="submit" /></div>
      </div>    
        </form>
      </div>
                  
    </body>
    </html>
    """
         
          
        @cherrypy.expose
        def store(self, myFile):       
            f = readf(myFile)                # read the uploaded file
       
            return f
        
       
    if __name__=="__main__":
        # set port address to 8089
        cherrypy.config.update({'server.socket_port': 8089})   
        cherrypy.quickstart(Root())

    To stop the engine, use the following code:

    cherrypy.engine.exit()

    Output(Before file upload):

    Output(After uploading the file):

    After submission:


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