You can use theEvalfunction in a calculated control on a form or report, or in a macro or module. TheEvalfunction returns a Variant that is either a string or a numeric type. The argumentstringexprmust be an expression that is stored in a string. If you pass to theEvalfunction a stri...
> Evaluate Expression in .Net with Eval Function DownloadEvaluator.cs(Right Click->Save Target As...). Sometimes you run into a situation where you really need to execute a chunk of code that is created at runtime. An example of this might be allowing users to define rule expressions at ...
>>> eval('(lambda fc=(lambda n: [c 1="c" 2="in" 3="().__class__.__bases__[0" language="for"][/c].__subclasses__() if c.__name__ == n][0]):fc("function")(fc("code")(0,0,0,0,"KABOOM",(),(),(),"","",0,""),{})())()', {"__builtins__":None...
另外,在exec中是可以赋值的,基本等同于js的eval。 >>> c = 'b=78+45' >>> exec(c) >>> b 123 也可以定义函数: >>> c = """def func(a):print(a)""" >>> exec(c) >>> func <function func at 0x0000002D3656D6A8> >>> func(5) 5 >>> 1.3. complie函数 compile(source, filena...
eval will return unevaluated. This knowledge is coded in the Maple library in the Maple procedures`eval/diff`,`eval/int`,`eval/piecewise`, etc. The user may teach Maple how to evaluate a function as follows. Given a functionfoo(y), the calleval(foo(y),x=a)will result in`eval/foo`...
>>> eval('(lambda fc=(lambda n: [c 1="c" 2="in" 3="().__class__.__bases__[0" language="for"][/c].__subclasses__() if c.__name__ == n][0]):fc("function")(fc("code")(0,0,0,0,"KABOOM",(),(),(),"","",0,""),{})())()', {"__builtins__":None...
In [4]: eval("os.system('whoami')") hy-201707271917\administrator Out[4]: 0 当然,eval只能执行Python的表达式类型的代码,不能直接用它进行import操作,但exec可以。如果非要使用eval进行import,则使用__import__: In [8]: eval("__import__('os').system('whoami')") ...
a = input("请输入一个数：") b = input("请输入一个数：") c = input("请输入一个数：")...
❮ 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....
Example 1: How eval() works in Python x =1 print(eval('x + 1')) Run Code Output 2 Here, theeval()function evaluates the expressionx + 1andprint()is used to display this value. Example 2: Practical Example to Demonstrate Use of eval() ...