If the ‘#’ character is present, integers use the ‘alternate form’įor formatting. '+' - indicates that a sign should be used for both positive as well as negative numbers '-' - indicates that a sign should be used only for negative numbers ( this is the default behavior ) ' ' - indicates that a leading space should be used on positive numbers The general form of a standard format specifier is: The format specifiers used by the existing ‘%’ operator, however If an object does not define its own format specifiers, a standard The first colon and the matching brace to the relevant underlyingįormatting method. The str.format() method merely passes all of the characters between The syntax for format specifiers is open-ended, since a classĬan override the standard format specifiers. Within a format field, the braceĬharacters always have their normal meaning. "My name is ’ syntax for escapes is only applied when used Gain a new method, ‘format’, which takes an arbitrary number of The built-in string class (and also the unicode class in 2.6) will That contains the same representation of characters as the Is, the result of the conversion will always result in an object In all cases, the type of the format string dominates - that Other words, there is no need for two separate APIs). To be able to properly deduce the output string type (in Objects, and in all cases there is sufficient information All of the function call interfacesĭescribed in this PEP can be used for both strings and unicode In the context of Python 2.x, the use of the word ‘string’ in thisĭocument refers to an object which may either be a regular string Of Python 3.0, it is assumed that all strings are unicode strings,Īnd that the use of the word ‘string’ in the context of thisĭocument will generally refer to a Python 3.0 string, which is Note on string encodings: When discussing this PEP in the context Specification of how formatting errors are handled.Specification of an API for user-defined formatting classes.Specification of a new set of special methods to control the.Specification of a new syntax for format strings.The string module, so that the underlying formatting engine Specification of functions and flag values to be added to.Specification of a new formatting method to be added to the.The specification will consist of the following parts: String into a template is not contemplated in this proposal,Īlthough the proposal does take care to define format stringsĪnd the API in such a way that an efficient template packageĬould reuse the syntax and even some of the underlying Which are only used once, so, for example, compilation of a This proposal is forĪ mechanism which, like ‘%’, is efficient for small strings String.Template, it is felt that each serves a distinct need,Īnd that one does not obviate the other. While there is some overlap between this proposal and Or only named arguments) is felt to be overly constraining. (meaning that one must choose between only positional arguments, Tuple as the second argument, but as many people have commented The current practice is to use either a dictionary or a Leaving all other variables to be squeezed into the remainingĪrgument. One of those arguments is already dedicated to the format string, The ‘%’ operator is primarily limited by the fact that it is aīinary operator, and therefore can take at most two arguments. String formatting operations (in other words, methods of the The primary scope of this PEP concerns proposals for built-in Python currently provides two methods of string interpolation: Operations, intended as a replacement for the existing ‘%’ string This PEP proposes a new system for built-in string formatting
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