small fixes

README.md

@@ -0,0 +1,9 @@
+# Math-scripts
+Python examples for beginners
+
+Scripts for solve / investigate mathematical exercises 
+by python3 scripts.
+
+Inspired by Dima |Matan| Mikhailov
+
+https://www.youtube.com/channel/UCocsNgfW9tGLP8zktA6CtRg

moving_Sierpinski_triangle.py

@@ -1,7 +1,27 @@
+#!/usr/bin/python3
+
+filling_char = 'A';     # Symbol for draw Serpinskiy triangle
+fps_forward  = 30;      # frame-per-second / animation speed
+fps_backward = 30;      # frame-per-second / animation speed
+
 import time
+import os
+
+# detect terminal sizes
+try:
+   # Since python 3.3 this method accessible
+   ts = os.get_terminal_size()   # get terminal size (in char-places)
+   height = ts.lines - 1         # height of serp-3angle = ht-1
+   width = int(ts.columns / 3)   # width of movement base = 1/3 of tw
+                                 # 1/3 is safe value; true mathematics can try calculate more beautiful
+except:
+   width = 26;    # ~ 80/3
+   height = 24;   # std DOS/CMD h/w values - safe mode or old python
+
 
+# create Serpinsky triangle
 a = [[1]]
-for i in range(73):
+for i in range(height):
     b = [1]
     for j in range(len(a[-1]) - 1):
         b.append(a[-1][j] + a[-1][j + 1])
@@ -12,17 +32,21 @@
         if a[i][j] % 2 == 0:
             a[i][j] = ' '
         else:
-            a[i][j] = 'A'
+            a[i][j] = filling_char
     d = ' '.join(a[i])
+
+
+# draw triangle with loop animation
 while 1:
-    for j in range(165):
-        time.sleep(.02)
+    for j in range(width):   # forward (left-to-right move)
+        time.sleep(1/fps_forward)
         for i in range(len(a)):
             f = ' '.join(a[i])
             e = (len(d) - len(f)) // 2
             print(j * ' ' + e * ' ' + f + e * ' ')
-    for j in range(165, 0, -1):
-        time.sleep(.02)
+
+    for j in range(width, 0, -1):   # backward (right-to-left move)
+        time.sleep(1/fps_backward)
         for i in range(len(a)):
             f = ' '.join(a[i])
             e = (len(d) - len(f)) // 2