bpo-22057: Clarify eval() documentation (GH-8812)
If a globals dictionary without a '__builtins__' key is passed to eval(), a '__builtins__' key will be inserted to the dictionary: >>> eval("print('__builtins__' in globals())", {}) True (As a result of this behavior, we can use the builtins print() and globals() even if we passed a dictionary without a '__builtins__' key to eval().)
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@ -435,8 +435,10 @@ are always available. They are listed here in alphabetical order.
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The *expression* argument is parsed and evaluated as a Python expression
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(technically speaking, a condition list) using the *globals* and *locals*
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dictionaries as global and local namespace. If the *globals* dictionary is
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present and lacks '__builtins__', the current globals are copied into *globals*
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before *expression* is parsed. This means that *expression* normally has full
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present and does not contain a value for the key ``__builtins__``, a
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reference to the dictionary of the built-in module :mod:`builtins` is
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inserted under that key before *expression* is parsed.
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This means that *expression* normally has full
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access to the standard :mod:`builtins` module and restricted environments are
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propagated. If the *locals* dictionary is omitted it defaults to the *globals*
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dictionary. If both dictionaries are omitted, the expression is executed in the
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