What does eval mean in python?

eval means "evaluation". It is a built-in function in python. It is used to execute a string expression and return the calculation result of the expression; that is, when assigning a variable, the right side of the equal sign means Written in string format, the return value is the result of this expression. Syntax "eval(expression[, globals[, locals]])".

The operating environment of this tutorial: windows7 system, python3 version, DELL G3 computer

eval() function

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

Syntax

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.

Example:

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

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