python 中带有打印函数的 eval() 函数出错

Question

我正尝试运行在 Python 空闲中执行此操作：

>>> eval(print("123*13"))

我得到了正确的输出，但它带有 TypeError:

123*13
Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    eval(print("123*13"))
TypeError: eval() arg 1 must be a string, bytes or code object

注意：
我不想 print(eval("123*13"))。
我想在 eval() 函数中使用 print()。这不是针对实际实现的，但是我在使用 eval() 函数时遇到了这个错误。我不是要求任何实际实施，而是出于好奇。

Answer 1

使用它：

eval('print("123*13")')

在 eval() 源代码中：

evel (__source: str | bytes | CodeType, __globals: Dict[str, Any] | None = ..., __locals: Mapping[str, Any] | None = ...) -> Any
'''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 only globals is given, locals defaults to it.'''
...

评估帮助():

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 as returned by compile().
    The globals must be a dictionary and locals can be any mapping,
    defaulting to the current globals and locals.
    If only globals is given, locals defaults to it.

您可以在 Python.org 中查看更多内容。

python 中带有打印函数的 eval() 函数出错

Error with eval() function with print function in python

python

eval