The eval (), EXEC () two functions in Python and several functions associated with them, such as Globals (), locals (), and compile ():1. Functions of the Eval function:Evaluates the value of the specified expression. That is, the Python code it
The former has been thinking of a problem, that is, how to let the user in the graphical interface input code (input code as a string), as part of the code to run, coincides with the Python crawler video tutorial, saw the use of the Eval function,
Eval functionfunction of FunctionsEvaluates the string str as a valid expression and returns the result of the calculation. The Python code it executes can only be a single operation expression (which does not support arbitrary assignment operations)
The eval (str [, Globals [, locals]) function evaluates the string str as a valid Python expression and returns the result of the calculation.Similarly, the EXEC statement executes the string str as valid Python code. The namespace of the code
The eval (STR [, globals [, locals]) function evaluates the string 'str' as a valid Python expression and returns the calculation result.
Similarly, the exec statement executes the string STR as a valid Python code. The namespace provided to the
This log is reproduced, the original link: http://skandgjxa.blog.163.com/blog/static/1415298201010262403483/eval (str [, Globals [, locals]]) function treats the string str as a valid Python tableTo evaluate the value and return the result of the
Python provides a description of the built-in functions for calling executable objects, involving exec, Eval, and compile three functions. The EXEC statement is used to execute a python statement stored in a code object, a string, a file, and the
There may be times when you need to dynamically create Python code and then execute it as a statement or evaluate it as an expression.1. exec>>>exec"print ' Hello, world! ' " Hello, world!.>>>fromimport sqrt>>>exec"sqrt=i" >>>sqrt (4) Traceback
The EXEC statement is used to execute a python statement stored in a string or file. For example, we can generate a string that contains Python code at run time, and then execute the statements using the EXEC statement. The following is a simple
I thought it was almost enough for the past. Hehe, see a lot of masters with high skills, the heart itch feel I can also improve AH. hahaha.After this practice, Sed,awk also have to deepen,,, Shell and Python, for the operation of the two can not be
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