>>> 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 #源可以是...
""" 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 mapping, defaulting to the current globals and locals. If onl...
_bisect browser imp...Enter any module name togetmore help.Or,type"modules spam"to searchformodules whose name or summary contain the string"spam".>>>help('print')Help on built-infunctionprintinmodule builtins:print(...)print(value,...,sep=' ',end='\n',file=sys.stdout,flush=False)...
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 ....
defeval(self,env):ifself.stringinenv:returnenv[self.string]raiseNameError("The name: {} is not defined".format(self.string)) Q3: Evaluating Call Expressions 现在,让我们为call表达式添加evaluate逻辑,比如add(2, 3)。记住,call表达式拥有一个操作符和0或多个操作数。
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...
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Seeast.literal_eval()for a function that can safely evaluate strings with expressions containing only literals. 执行动态标表达式求值 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...
``parse_int``, if specified, will be called with the string of every JSON int to be decoded. By default this is equivalent to int(num_str). This can be used to use another datatype or parser for JSON integers (e.g. float). ...
In line 26, you define evaluate(). This function takes the string expression as an argument and returns a float that represents the result of evaluating the string as a math expression. In line 29, you use compile() to turn the input string expression into compiled Python code. The compili...