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File simple/

+import flask
+import pylab
+import os
+import os.path
+import tempfile
+import random
+app = flask.Flask(__name__)
+def index():
+    if flask.request.method == 'POST':   
+        if 'plot_button' in flask.request.form:
+            x_data_raw = str(flask.request.form['x_data'])
+            y_data_raw = str(flask.request.form['y_data'])
+            x_data = x_data_raw.split()
+            y_data = y_data_raw.split()
+            try:
+                ok = True
+                x_data_float = [float(val) for val in x_data]
+                y_data_float = [float(val) for val in y_data]
+                x_data_str = '\n'.join(x_data)
+                y_data_str = '\n'.join(y_data)
+            except ValueError:
+                ok = False
+                error_msg = 'Error: unable to convert to floating point number'
+                x_data_str = x_data_raw
+                y_data_str = y_data_raw
+            if ok:
+                if len(x_data) >= 1 and len(y_data) >= 1:
+                    n = min([len(x_data_float), len(y_data_float)])
+                    x_data_float = x_data_float[:n]
+                    y_data_float = y_data_float[:n]
+                    pylab.plot(x_data_float,y_data_float,'o-')
+                    pylab.title('Plot Title')
+                    pylab.grid('on')
+                    pylab.xlabel('x label')
+                    pylab.ylabel('y label')
+                    filename = os.path.join(os.curdir, 'static', 'plot.png')
+                    pylab.savefig(filename)
+                    pylab.close()
+                    return flask.redirect(flask.url_for('plot_data'))
+                else:
+                    if len(x_data) < 1:
+                        error_msg = 'Error: insufficient x values for plot' 
+                    else:
+                        error_msg = 'Error: insufficient y values for plot'
+        if 'clear_button' in flask.request.form: 
+            error_msg = ''
+            x_data_str = '' 
+            y_data_str = '' 
+    else:
+        error_msg = ''
+        x_data_str = '' 
+        y_data_str = '' 
+    render_args = {
+            'x_data_str': x_data_str,
+            'y_data_str': y_data_str,
+            'error_msg': error_msg,
+            }
+    return flask.render_template('index.html',**render_args) 
+def plot_data():
+    randint = random.randint(10000,20000)
+    return flask.render_template('plot.html',randint=randint) 
+if __name__ == '__main__':
+    app.debug = True

File simple/static/plot.png

New image

File simple/templates/index.html

+    <h1> Figure Slammer </h1>
+    <div>
+        <form method="post">
+            <table>
+                <tr>
+                    <td>
+                        <div>
+                            <center> <b> x values </b> </center>
+                            <div>
+                                <textarea rows="30" cols="15" name="x_data">{{x_data_str}}</textarea> 
+                            </div>
+                        </div>
+                    </td>
+                    <td>
+                        <center> <b> y values </b> </center>
+                        <div>
+                            <textarea rows="30" cols="15" name="y_data">{{y_data_str}}</textarea> 
+                        </div>
+                    </td>
+                </tr>
+            <table>
+            <button name="plot_button"> Plot</button>
+            <button name="clear_button"> Clear</button>
+        </form>
+        <p> <font color="red"> {{error_msg}}<font>  </p>

File simple/templates/plot.html

+    <h1> Figure Slammer </h1>
+    <img src="static/plot.png?{{randint}}">  </img>
+    <p> {{develop}} </p>