Server-Side Scripting/Requests/Python (Flask)
app.py
[edit | edit source]# Converts a Fahrenheit temperature to Celsius using a GET request and
# converts a Celsius temperature to Fahrenheit using a POST request.
#
# References:
# https://www.mathsisfun.com/temperature-conversion.html
# https://en.wikibooks.org/wiki/Python_Programming
# https://www.digitalocean.com/community/tutorials/processing-incoming-request-data-in-flask
import flask
app = flask.Flask(__name__)
GET_FORM = """
<form method="GET">
<label for="fahrenheit">Enter Fahrenheit temperature:</label>
<input type="text" id="fahrenheit" name="fahrenheit">
<input type="submit" value="Submit">
</form>
"""
EMPTY_PARAGRAPH = """
<p> </p>
"""
POST_FORM = """
<form method="POST">
<label for="celsius">Enter Celsius temperature:</label>
<input type="text" id="celsius" name="celsius">
<input type="submit" value="Submit">
</form>
"""
@app.route('/', methods=["GET"])
def root_get():
return process_get_request()
@app.route('/', methods=["POST"])
def root_post():
return process_post_request()
def process_get_request():
request = flask.request
result = GET_FORM
try:
fahrenheit = float(request.args["fahrenheit"])
celsius = (fahrenheit - 32) * 5 / 9
result += "<p>" + str(fahrenheit) + "° Fahrenheit is " + \
str(celsius) + "° Celsius</p>"
except:
result += EMPTY_PARAGRAPH
result += POST_FORM + EMPTY_PARAGRAPH
return result
def process_post_request():
request = flask.request
result = GET_FORM + EMPTY_PARAGRAPH + \
POST_FORM
try:
celsius = float(request.form["celsius"])
fahrenheit = celsius * 9 / 5 + 32
result += "<p>" + str(celsius) + "° Celisus is " + \
str(fahrenheit) + "° Fahrenheit</p>"
except:
result += EMPTY_PARAGRAPH
return result
if __name__ == "__main__":
app.run(host='0.0.0.0', port=5000)
Try It
[edit | edit source]Copy and paste the code above into the following free online development environment or use your own Python (Flask) compiler / interpreter / IDE.