Добавлена глава по типам коллекций

src-datatype/quadratic.py~

@@ -0,0 +1,49 @@
+# -*- coding: utf-8 -*-
+import cmath
+import math
+import sys
+
+# Start get_float
+def get_float(msg, allow_zero):
+    x = None
+    while x is None:
+        try:
+            x = float(input(msg))
+            if not allow_zero and abs(x) < sys.float_info.epsilon:
+                print("zero is not allowed")
+                x = None
+
+        except ValueError as err:
+            print(err)
+    return x
+# End get_float
+
+# Start 1st block
+print("ax\N{SUPERSCRIPT TWO} + bx + c = 0")
+a = get_float("enter a: ", False)
+b = get_float("enter b: ", False)
+c = get_float("enter c: ", False)
+# End 1st block
+
+# Start 2d block
+x1 = None
+x2 = None
+discriminant = (b ** 2) - (4 * a * c)
+if discriminant == 0:
+    x1 = -(b / (2 * a))
+else:
+    if discriminant > 0:
+        root = math.sqrt(discriminant)
+    else: # discriminant < 0
+        root = cmath.sqrt(discriminant)
+        x1 = (-b + root) / (2 * a)
+        x2 = (-b - root) / (2 * a)
+# End 2d block
+
+# Start 3d block
+equation = ("{0}x\N{SUPERSCRIPT TWO} + {1}x + {2} = 0"
+            " \N{RIGHTWARDS ARROW} x = {3}").format(a, b, c, x1)
+if x2 is not None:
+    equation += " or x = {0}".format(x2)
+print(equation)
+# End 3d block