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Thanks for the suggested. Here's a revised wording and a slightly more legible example:
 Return a copy of the string where all tab characters are replaced by zero or
 more spaces, depending on the current tab column and the given tab size.
 Starting at the first character of the string, the tab column is set to
 zero. Whenever a tab character (``\t``) is encountered, space characters
 are inserted as needed until the next tab position is reached and the tab
 column is set to that tab position; the tab character itself is not copied.
 Whenever a newline character (``\n`` or ``\r``) is encountered, it is copied
 and the tab column is reset to zero. Any other character is copied unchanged
 and the tab column is incremented by one regardless of how it may be
 represented when printed. If *tabsize* is not given, a tab size of 8
 characters is assumed.
 >>> '012\t4\t89'.expandtabs(4)
 '012 4 89'