Terry J. Reedy <tjre...@udel.edu> added the comment: Suggested doc change for LibRef / StringServices / string.... / Format String Syntax
1. In the grammar box, replace the field_name line with " field_name ::= arg_name ("." attribute_name | "[" element_index "]")* arg_name ::= (identifier | integer)? " The current text ambiguously uses "field_name" for both 'field_name' and 'arg_name'. I found explaining the rule for blank arg_names in field_names easier and clearer with two separate unambiguous terms. Note: 'element_index' should be linked to its definition just as, for instance, 'attribute_name' is. Currently it is not. 2. Revise the next two paragraphs as follows (using * to indicate grammar-term italics as in the current text -- except *all* is just for emphasis): " In less formal terms, the replacement field starts with a *field_name* that specifies the object whose value is to be formatted and inserted into the output instead of the replacement field. The *field_name* is optionally followed by a *conversion* field, which is preceded by an exclamation point '!', and a *format_spec*, which is preceded by a colon ':'. These specify a non-default format for the replacement value. The *field_name* itself begins with an *arg_name* that is either a number or a keyword. If it’s a number, it refers to a positional argument of the str.format() method, and if it’s a keyword it refers to a named keyword argument. If the numerical arg_names in a format string are 0, 1, 2, ... in sequence, they can *all* be omitted (not just some) and the numbers 0, 1, 2, ... will be automatically inserted in order. The *arg_name* can be followed by any number of index or attribute expressions. An expression of the form '.name' selects the named attribute using getattr(), while an expression of the form '[index]' does an index lookup using __getitem__(). " Note: getattr and __getitem__ should be left linked as in the current text. 3. In the following examples, add ''' "From {} to {}" # Same as "From {0] to {1}" ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue5237> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com