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...strings use the same rules as normal strings, raw strings, binary strings, and triple quoted strings. That is, the string must end with the same character that it started with: if it starts with a single quote it must end with a single quote, etc. This implies that any code that currently scans Python code looking for strings should be trivially modifiable to recognize f-strings (parsing within an f-string is another matter, of course). Once tokenized, f-strings are parsed in to literal strings ...
...string concatenation functions in the string module that are implemented in C. In particular, string.joinfields(list_of_strings, delimiter) concatenates a list of strings, placing a delimiter of choice between each two strings. Nothing stops us from concatenating a list of characters (which are just strings of length one in Python), using the empty string as delimiter. Lo and behold: import string def f6(list): return string.joinfields(map(chr, list), "") ...
...string formatting operations, intended as a replacement for the existing '%' string formatting operator. Rationale Python currently provides two methods of string interpolation: The '%' operator for strings. [1] The string.Template module. [2] The primary scope of this PEP concerns proposals for built-in string formatting operations (in other words, methods of the built-in string type). The '%' operator is primarily limited by the fact that it is a binary operator, and therefore can take at ...
...strings in this application; out of 36,000 strings (with 1,310,000 chars), 35713 where ASCII strings (with 1,300,000 chars). The sources for these strings where not further analysed; many of them likely originate from identifiers in the library, and string constants in Django's source code. In comparison to Python 2, both Unicode and byte strings need to be accounted. In the test application, Unicode and byte strings combined had a length of 2,046,000 units (bytes/chars) in 2.x, and 2,200,000 un...
...String Interpolation, which proposed "formatted strings" was accepted September 9th, 2015. Additional background and rationale given during its design phase is detailed below. To recap that PEP, a string prefix was introduced that marks the string as a template to be rendered. These formatted strings may contain one or more expressions built on the existing syntax of str.format(). The formatted string expands at compile-time into a conventional string format operation, with the given expressions...
...string prefixes ('r' or 'u'). Such a string is processed for interpolation after the normal interpretation of backslash-escapes in its contents. The processing occurs just before the string is pushed onto the value stack, each time the string is pushed. In short, Python behaves exactly as if '$' were a unary operator applied to the string. The operation performed is as follows: The string is scanned from start to end for the '$' character (\x24 in 8-bit strings or \u0024 in Unicode strings)....
...strings”, and the proposed one as “f-literals”. Furthermore, it will refer to the {}-delimited expressions in f-literals/f-strings as “expression portions” and the static string content around them as “string portions”. Motivation The current implementation of f-strings in CPython relies on the existing string parsing machinery and a post processing of its tokens. This results in several restrictions to the possible expressions usable within f-strings: It is impossible to use the quote chara...
...string-formatting) [2]str.format (https://docs.python.org/3/library/string.html#formatstrings) [3]string.Template documentation (https://docs.python.org/3/library/string.html#template-strings) [4]PEP 215: String Interpolation [5]PEP 292: Simpler String Substitutions [6]PEP 3101: Advanced String Formatting [7]PEP 498: Literal string formatting [8]FormattableString and C# native string interpolation (https://msdn.microsoft.com/en-us/library/dn961160.aspx) [9...
...strings for debugging or for logging. Although all non-ASCII characters are escaped, this does not matter when most of the string's characters are ASCII. But for other languages, such as Japanese where most characters in a string are not ASCII, this is very inconvenient. We can use print(aJapaneseString) to get a readable string, but we don't have a similar workaround for printing strings from collections such as lists or tuples. print(listOfJapaneseStrings) uses repr() to build the string to...
...string substitution feature, also known as string interpolation. This PEP is "simpler" in two respects: Python's current string substitution feature (i.e. %-substitution) is complicated and error prone. This PEP is simpler at the cost of some expressiveness. PEP 215 proposed an alternative string interpolation feature, introducing a new $ string prefix. PEP 292 is simpler than this because it involves no syntax changes and has much simpler rules for what substitutions can occur in the string...
String-SIG - SIG on Enhancement of Python String Processing SIG on Enhancement of Python String Processing This sig has been retired. New postings to the mailing list will be rejected, but the archives of the old list are still available for perusal. See the SIGs home page for info about active and inactive lists. This is forum for discussion of ideas, designs, and implementations of enhancements to Python's string pro...
...string: LiteralString s: str = literal_string # OK literal_string: LiteralString = s # Error: Expected LiteralString, got str. literal_string: LiteralString = "hello" # OK Addition of literal strings: def expect_literal_string(s: LiteralString) -> None: ... expect_literal_string("foo" + "bar") # OK expect_literal_string(literal_string + "bar") # OK literal_string2: LiteralString expect_literal_string(literal_string + literal_string2) # OK plain_string: str expect_literal_string(li...
...string constants in Python. Currently, the value of string constant is all the text between quotations, maybe with escape sequences substituted, e.g.: def f(): """ la-la-la limona, banana """ def g(): return "This is \ string" print repr(f.__doc__) print repr(g()) prints: '\n\tla-la-la\n\tlimona, banana\n\t' 'This is \tstring' This PEP suggest two things: ignore the first character after opening quotation, if it is newline ignore in string constants all spaces and...
...string (unicode) "": native string (str) b"": binary data (str, also aliased as bytes) In Python 3, the latin-1 decoded native strings are not distinguished from any other text strings: "": text string (str) "": native string (str) b"": binary data (bytes) If from __future__ import unicode_literals is used to modify the behaviour of Python 2, then, along with an appropriate definition of n(), the distinction can be expressed as: "": text string n(""): native string b"": binary data (While n...
...strings, and the join method: """This string extends across multiple lines, but you may want to use something like Textwrap.dedent to clear out the leading spaces and/or reformat. """ >>> "".join(["empty", "string", "joiner"]) == "emptystringjoiner" True >>> " ".join(["space", "string", "joiner"]) == "space string joiner" >>> "\n".join(["multiple", "lines"]) == "multiple\nlines" == ( """multiple lines""") True Concerns Operator Precedence Guido ...
...string syntax [1]. The new syntax for strings, including the new bytes literal, is: stringliteral: [stringprefix] (shortstring | longstring) stringprefix: "b" | "r" | "br" | "B" | "R" | "BR" | "Br" | "bR" shortstring: "'" shortstringitem* "'" | '"' shortstringitem* '"' longstring: "'''" longstringitem* "'''" | '"""' longstringitem* '"""' shortstringitem: shortstringchar | escapeseq longstringitem: longstringchar | escapeseq shortstringchar: <any source character except "\" or newline or th...
...strings. This change would make it easier to write code that works with either string type and would also make some existing code handle unicode strings. The C function PyObject_Str() would remain unchanged and the function PyString_New() would be added instead. Rationale Python has had a Unicode string type for some time now but use of it is not yet widespread. There is a large amount of Python code that assumes that string data is represented as str instances. The long-term plan for Pytho...
...string. This can lead to cases where the docstring and assignment may be separated by other expressions: class C: "C doc string" b = 2 def x(self): "C.x doc string" y = 3 return 1 "b's doc string" Since the definition of method "x" currently does not reset the used assignment name variable, it is still valid when the compiler reaches the docstring "b's doc string" and thus assigns the string to __doc_b__. A possible solution to this problem would be...
...string? (Python, post-regex) (Iron)Python formatting issue with modulo operator & "negative zero" (Python, pre-round) Negative sign in case of zero in java (Java, post-regex) Prevent small negative numbers printing as "-0" (Objective-C, custom number formatter) What we would like instead is a first-class option to normalize negative zero, on top of everything else that numerical string formatting already offers. Rationale There are use cases where negative zero is unwanted in formatted nu...
...string>, line 37) Unexpected indentation. <td align="center">yes</td> <td align="center">no</td> <td align="center">abstain</td> System Message: WARNING/2 (<string>, line 40) Block quote ends without a blank line; unexpected unindent. </tr> <tr><td>Paul Everitt</td> System Message: ERROR/3 (<string>, line 42) Unexpected indentation. <td align="center">yes</td> <td...