1. The built-in function `eval()` in Python serves to evaluate the result of a string that represents an expression. In other words, when a variable is assigned a value in the form of a string on the right-hand side of an equal sign, `eval()` returns the result of tha...
expression:这个参数是一个字符串,python会使用globals字典和locals字典作为全局和局部的命名空间,将expression当做一个python表达式(从技术上讲,是一个条件列表)进行解析和计算。 globals:这个参数管控的是一个全局的命名空间,也就是我们在计算表达式的时候可以使用全局的命名空间中的函数,如果这个参数被提供了,并且没有提...
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...
Example #30Source File: main.py From vmf_vae_nlp with MIT License 5 votes def evaluate(data_source): # Turn on evaluation mode which disables dropout. model.eval() total_loss = 0 ntokens = len(corpus.dictionary) hidden = model.init_hidden(eval_batch_size) for i in range(0, data_...
以下是eval类eval.evaluate方法的5个代码示例,这些例子默认根据受欢迎程度排序。您可以为感觉有用的代码点赞,您的评价将有助于系统推荐出更好的Python代码示例。 示例1: compute_validation_map ▲点赞 7▼ # 需要导入模块: import eval [as 别名]# 或者: from eval importevaluate[as 别名]defcompute_validation...
example2: x = 10 expr = """ z = 30 sum = x + y + z print(sum) """ def func(): y = 20 exec(expr) exec(expr, {'x': 1, 'y': 2}) exec(expr, {'x': 1, 'y': 2}, {'y': 3, 'z': 4}) func() 运行结果: 60 33 34 3、complie()函数 compile() 函数将一个字...
Python eval() Function: Examples Here, we take a look at how you can use the Python function eval() next time you need it: Code to Show a Basic Example of Evaluating a String Expression Using eval() Here, the expression x*x+6 is evaluated using eval() in Python, where x has the...
Example: >>> x = 1 >>> eval('x+1') 2 This function can also be used to execute arbitrary code objects (such as those created by compile()). In this case pass a code object instead of a string. If the code object has been compiled with 'exec' as the mode argument, eval()‘...