What is eval in python

The eval() function in python is used to execute a string expression and return the value of the expression.

The following is the syntax of the eval() method:

eval(expression[, globals[, locals]])

Parameters

expression -- Expression.

globals -- Variable scope, global namespace, if provided, must be a dictionary object.

locals -- Variable scope, local namespace, if provided, can be any mapping object.

Return value

Returns the expression calculation result.

The following shows an example of using the eval() method:

>>>x = 7
>>> eval( '3 * x' )
21
>>> eval('pow(2,2)')
4
>>> eval('2 + 2')
4
>>> n=81
>>> eval("n + 4")
85

Related recommendations: "Python Tutorial"

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