python函數之compile()函數

compile(source, filename, mode[, flags[, dont_inherit]])

中文說明：將source編譯為程式碼或AST物件。程式碼物件能夠透過exec語句來執行或eval()進行求值。

參數source：字串或AST（Abstract Syntax Trees）物件。

參數 filename：程式碼檔案名稱，如果不是從檔案讀取程式碼則傳遞一些可辨認的值。

參數model：指定編譯程式碼的種類。可以指定為 ‘exec’,’eval’,’single’。

參數flag和dont_inherit：這兩個參數暫不介紹，可選參數。

版本：在python2.3、2.6、2.7、3.2中均有不同，使用時要引起注意，相容python3

#英文說明：

Compile the source into a code or AST object. Code objects can be executed by an exec statement or evaluated by a call to eval(). source can either be a string or an AST object. the ast module documentation for information on how to work with AST objects.

The filename argument should give the file from which the code was read; pass some recognizable value if it wasn't read from afile (able value if it wasn't read' ;string>' 是 commonly used).

The mode argument specifies what kind of code must be compiled; it can be 'exec' if source consists of a sequence of statements, 'eval' if it consissequence if single expression, or 'single' if it consists of a single interactive statement (in the latter case, expression statements that evaluate to something other than None will be printed).

The optional arguments flags and fudonture control optional arguments f state。 is not (or is zero) then the future statements specified by the flags argument are used in addition to those that would be used anyway. If dont_inherit is a non-zero integer then the flags effgument is-zero integer then the flags effgument is state – ) instate the flags effgument is state –arture state state the flags. call to compile are ignored.

Future statements are specified by bits which can be bitwise ORed together to specify multiple statements. The bitfield required to specify a given feature can be found as the piler required to specify a given feature can be found as the 4piler_frem in formbe foundm in 完成 be found) inpiler_found cound be foundn 完成 be found cound. __future__ module.

This function raises SyntaxError if the compiled source is invalid, and TypeError if the source contains null bytes.

Note When compiling a string with multiline in cor 'eval' mode, input must be terminated by at least one newline character. This is to facilitate detection of incomplete and complete statements in the code module.

Changed in version 2.3: The flagule.

Changed in version 2.3: The flagule。 were added.

Changed in version 2.6: Support for compiling AST objects.

Changed in version 2.7: Allowed use of Windows and Mac newlines##Changed in version 2.7: Allowed use of Windows and Mac newlines##Changed in version 2.7: Allowed use of Windows and Mac newlines . Also input in 'exec' mode does not have to end in a newline anymore.

###程式碼範例###：###

>>> code = "for i in range(0, 10): print i"
>>> cmpcode = compile(code, '', 'exec')
>>> exec cmpcode
0
1
2
3
4
5
6
7
8
9
>>> str = "3 * 4 + 5"
>>> a = compile(str,'','eval')
>>> eval(a)
17

以上是python函數之compile()函數的詳細內容。更多資訊請關注PHP中文網其他相關文章！