chapters/chap01.ipynb

[jgfoster]

line 164:

-    "* **integers**, which represent whole numbers, and \n",
+    "* **integers**, which represent whole numbers and their negative counterparts, and \n",

line 584:

-    "Python provides a function called `len` that computes the length of a string.`"
+    "Python provides a function called `len` that computes the length of a string."

[AllenDowney]

I have cleaned this up by removing all reference to whole numbers. Thanks!