Python 执行字符串表达式函数(eval exec execfile)-Python Tutorial-php.cn

Python 执行字符串表达式函数(eval exec execfile)

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Release： 2016-06-16 08:42:54

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仔细研读后学习了三个函数：
eval:计算字符串中的表达式
exec:执行字符串中的语句
execfile:用来执行一个文件

需注意的是，exec是一个语句，而eval()和execfile()则是内建built-in函数。

Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> x=1
>>> print eval("x+1")
2
>>> exec "print 'http://blog.leniy.org/python-eval-exec-execfile.html'"
http://blog.leniy.org/python-eval-exec-execfile.html
>>>

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同时，我们有时使用input输入一些数据，例如

>>> input("请输入:")
请输入:1+2**3
9
>>>

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其实这里的input也是eval的应用，等效于

>>> eval(raw_input("请输入:"))
请输入:1+2**3
9
>>>

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Related labels：

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