5、eval() 源码: 代码语言:python 代码运行次数:0 运行 AI代码解释 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(...
字符串里有个null,转了之后变成了None,已经变成Python格式的需求了,但是这个时候我们直接使用eval()进行转的话,可能会报错,提示‘null’没有定义,所以如果有布尔类型的字符串转字段时候使用loads()、没有的话直接使用eval()也可以 # -*- coding:utf-8 -*-importjson json_str ='{"token":"dasgdhasdas", ...
This means that the equivalent of {exprlist} = {next_value} is executed for each item in the iterable. An interesting example that illustrates this: for i in range(4): print(i) i = 10 Output: 0 1 2 3 Did you expect the loop to run just once? 💡 Explanation: The assignment ...
View Code eval():计算字符表达式 exec():执行编译,可以直接执行字符串 eval()函数: eval参数是一个字符串, 可以把这个字符串当成表达式来求值, 比如'x+1'就是一个表达式字符串 >>> x = 1 >>> print eval('x+1') 2 divmod() View Code dir():#快速查看,对象提供了哪些功能 id():返回对象的唯一...
5. exec/eval exec语句用来执行储存在字符串或文件中的Python语句;eval语句用来计算存储在字符串中的有效Python表达式。 cmd = "print 'hello world'" exec cmd #hello world expression = "10 * 2 + 5" print eval(expression) #25 6. assert
eval(expression[, globals[, locals]]) 1. 参数 expression -- 表达式。 globals -- 变量作用域,全局命名空间,如果被提供,则必须是一个字典对象。 locals -- 变量作用域,局部命名空间,如果被提供,可以是任何映射对象。 返回值 返回表达式计算结果。
Notes --- The behavior of ``indent=0`` varies from the stdlib, which does not indent the output but does insert newlines. Currently, ``indent=0`` and the default ``indent=None`` are equivalent in pandas, though this may change in a future release. ``orient='table'`` contains a ...
node. Equivalent to compile(source, filename, mode, PyCF_ONLY_AST). """ return compile(source, filename, mode, PyCF_ONLY_AST) def compile(source, filename, mode, flags=0, dont_inherit=False, optimize=-1) Compile source into a code object that can be executed by exec() or eval()...
内置函数 eval(),Python 官方文档描述如下: 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. The source may be a string representing a Python expression or a code object...
90 compile(source,filename,mode,flags = 0,dont_inherit = False,optimize = -1)91 将源编译成代码或AST对象。代码对象可以由exec()或执行eval()。 源可以是普通字符串,字节字符串或AST对象。ast有关如何使用AST对象的信息,请参阅模块文档。92