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labtest1.py

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+# lab test1: pascal triangle
+# author: michael tennyson
+# date 24/10/19
+
+# function that makes the pascal triangle and displays it
+def make_new_row(choice):
+   old_row = [1]
+   y = [0]
+   line_list = [old_row]
+
+    # the following for loop adds the first number in the first line together
+    # this is done iteratively to form the pascal triangle
+    # the pascal triangle is assigned each row in the pascal triangle as a string, creating the triangle
+    # the purpose of the zip function in the code is to pass the numbers being added to each row and return a new row that is a tuple
+   for i in range(choice - 1):
+      pascal_triangle = ' '.join([str(i) for i in old_row])
+      print(pascal_triangle.center(100))
+      old_row = [l + r for l, r in zip(old_row + y, y + old_row)]
+      line_list = line_list + [old_row]
+
+   print(line_list)
+
+number = int(input("enter the number for the desired height of your pascal triangle\n"))
+
+# error checking if statements, preventing a user from entering any other character except numbers
+alpha = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWYYX'
+if number == "":
+    print("you did not enter a number\n")
+# error checking to see if the user has entered a letter
+elif number in list(alpha):
+    print("you cannot enter a letter\n")
+else: # function call
+    make_new_row(number)