The eval() function can also execute code dynamically. For example, when we need to execute different Python code snippets dynamically based on user input, eval() comes in handy. Suppose the user inputs a simple function call string, such as "abs(-5)", we can use eval() to execute th...
Example 1: How eval() works in Python x = 1print(eval('x + 1')) Output 2 Here, theeval()function evaluates the expressionx + 1andprintis used to display this value. 回到顶部 Example 2: Practical Example to Demonstrate Use of eval() # Perimeter of SquaredefcalculatePerimeter(l):retur...
evaluated expression.Syntax errors are reportedasexceptions.Example:>>>x=1>>>eval('x+1')2Thisfunctioncan also be used to execute arbitrary codeobjects(suchasthose created bycompile()).Inthiscasepass a code object insteadofa string.If the code object has been compiledwith'exec'asthe mode arg...
Theeval()function takes three parameters: expression- thestringparsed and evaluated as a Python expression globals(optional) - adictionary locals(optional)- a mapping object. Dictionary is the standard and commonly used mapping type in Python. The use ofglobalsandlocalswill be discussed later in th...
This function can also be used to execute arbitrary code objects (such as those created bycompile()). In this case pass a code object instead of a string. If the code object has been compiled with'exec'as themodeargument,eval()‘s return value will beNone. ...
Seeast.literal_eval()for a function that can safely evaluate strings with expressions containing only literals. 下面我做一下简单的翻译,有可能有一些翻译不好的地方,见谅。 函数原型: eval(expression,globals=None,locals=None) 参数: expression:这个参数是一个字符串,python会使用globals字典和locals字典作为...
evaluated expression. Syntax errors are reportedasexceptions. Example: >>> x=1>>> eval('x+1')2This function can also be used to execute arbitrary codeobjects(suchasthose createdbycompile()). Inthiscasepass a codeobjectinstead of astring. If the codeobjecthas been ...
python内置函数4-eval() Help on built-in function eval in module __builtin__: eval(...) eval(source[, globals[, locals]]) -> value Evaluate the source in the context of globals and locals. The source may be a string representing a Python expression...
❮ Built-in Functions ExampleGet your own Python ServerEvaluate the expression 'print(55)':x = 'print(55)'eval(x) Try it Yourself » Definition and UsageThe eval() function evaluates the specified expression, if the expression is a legal Python statement, it will be executed.Syntax...
Syntax errors are reported as exceptions. Example:>>>x=1>>>eval('x+1')2This function can al...