Language Structure Of Syntax Instruction Video
Syntax (Part 1) Language Structure Of Syntax InstructionA Python program is read by a parser. Input to the parser is a stream of tokensgenerated by the lexical analyzer.
This chapter Language Structure Of Syntax Instruction how the lexical analyzer breaks a file Oc tokens. Python reads program text as Unicode code points; the encoding of a source file can be given by an encoding declaration and defaults to UTF-8, see PEP for details. If the source file cannot be decoded, a SyntaxError is raised. A logical line is constructed from one or more physical lines by following the explicit or implicit line joining rules. A physical line is a sequence of characters terminated by an end-of-line sequence. All of these forms can be used equally, regardless of platform. The end of input also serves as an implicit terminator for the final physical line.
A comment starts with a Instructuon character that is not part of a string literal, and ends at the end of the physical line. A comment signifies the end of the logical line unless the implicit line joining rules are invoked. Comments are ignored by the syntax. The encoding declaration must appear on a line of its own. If it is the second line, the first line must also be a comment-only line.
The recommended forms of an encoding expression are. If no encoding declaration is found, the default encoding is UTF If an encoding is declared, the encoding name must be recognized by Python.
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The encoding is used for all lexical analysis, including string literals, comments and identifiers. For example:. A line ending in a backslash cannot carry a comment. A backslash does not continue a comment. A backslash does not continue a token except for string literals i.
A backslash is illegal elsewhere on a line outside a string literal. Expressions in parentheses, square brackets or curly braces can be split over more than one physical line without using backslashes.
Implicitly continued lines can carry comments. The indentation of the continuation lines is not important. Blank continuation lines are allowed.]
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