语法 >>> help(eval) Help on built-in function eval in module builtins: eval(source, globals=None, locals=None, /) Evaluate the given source in the context of globals and locals.#在全局变量和局部变量的上下文中评估给定的源。 The source may be a string representing a Python expression #源...
从上面示例我们可以看出,eval()是用于字符串的表达式运算的,在Excel中也有这样的函数,宏函数evaluate()也能够实现这样的功能。 21.exac() 22.filter() filter()是用来过滤的。把满足条件的返回过来,否则过滤掉。 >>> li = [11, 22, 33, 44] >>> def func(x): ... if x>33: ... return True ....
>>> x = 1 >>> print eval('x+1') 2 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 val...
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“falsy” which means they evaluate to False in a Boolean context. A not-empty string evaluates...
Seeast.literal_eval()for a function that can safely evaluate strings with expressions containing only literals. 说明: 1. 执行动态语句,返回语句执行的值。 >>> eval('1+2+3+4') 10 2. 第一个参数为语句字符串,globals参数和locals参数为可选参数,如果提供,globals参数必需是字典,locals参数为mapping对...
解决措施:在Python代码的evaluate方法中增加如下语句。 return ret.encode('utf-8') 问题现象三:调用Python 3 UDF时,运行报错描述为UnicodeDecodeError: 'utf-8' codec can't decode byte xxx in position xxx: invalid continuation byte。 产生原因:函数签名中输入参数类型是STRING,但是调用Python 3 UDF时输入的字...
def eval(*args, **kwargs): # real signature unknown """ Evaluate the given source in the context of globals and locals. The source may be a string representing a Python expression or a code object as returned by compile(). The globals must be a dictionary and locals can be any mappin...
To evaluate a string-based expression, Python’s eval() runs the following steps: Parse expression Compile it to bytecode Evaluate it as a Python expression Return the result of the evaluation The name expression for the first argument to eval() highlights that the function works only with exp...