process user error input

Author: weiyanhua

chaos.py

@@ -2,7 +2,17 @@
 
 def main():
     print ("This program illustrates a chaotic function")
-    x = float((input("Enter a number between 0 and 1: ")))
+
+    while True:
+        try:
+            x = float((input("Enter a number between 0 and 1: ")))
+            if (0 < x and x < 1):
+                break
+            else:
+                print("Please enter correct number")
+        except Exception as e:
+            print("Please enter correct number")
+
     for i in range(10):
         x = 3.9 * x * (1-x)
         print (x)