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:
- Create any text file to read or existing file can also be used. Geeks.txt file is used in the program.
- Create user interface that upload a file from system
- Write cherrypy program that read the content of file and show its content.
<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>
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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())
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To stop the engine, use the following code:
cherrypy.engine.exit()
Output(Before file upload):
Output(After uploading the file):
After submission: