fix typo

Author: chichilalescu

Lecture-1-Introduction-to-Python-Programming.ipynb

@@ -537,7 +537,7 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "Although not explicitly specified, a variable do have a type associated with it. The type is derived form the value it was assigned."
+      "Although not explicitly specified, a variable do have a type associated with it. The type is derived from the value that was assigned to it."
      ]
     },
     {