测试 python class 是否为 str、list 等
Test if python class is str, list, etc
我有一个 class 列表：
[<class 'str'>, <class 'str'>, <class 'str'>, <class 'str'>, <class 'datetime.date'>, <class 'decimal.Decimal'>, <class 'decimal.Decimal'>, <class 'str'>, <class 'datetime.date'>, <class 'decimal.Decimal'>, <class 'decimal.Decimal'>, <class 'decimal.Decimal'>]
我想做一个类似于 isinstance() 的布尔测试：
[isinstance(x, str) for x in l]
但是 isinstance() 只接受对象而不是 classes.
我想要的结果，对于上面的列表来测试 class 是否是一个字符串，应该是这样的：
[True, True, True, True, False, False, False, True, False, False, False, False]
使用==运算符：
[x == str for x in l]
由于您有 类 的列表，因此您需要使用 issubclass rather than isinstance:
[issubclass(x, str) for x in l]
来自 Python 文档：
issubclass(class, classinfo)
Return True if class is a subclass (direct, indirect, or virtual) of classinfo. A class is considered a subclass of itself. classinfo may be a tuple of class objects or a Union Type, in which case return True if class is a subclass of any entry in classinfo. In any other case, a TypeError exception is raised.
我有一个 class 列表：
[<class 'str'>, <class 'str'>, <class 'str'>, <class 'str'>, <class 'datetime.date'>, <class 'decimal.Decimal'>, <class 'decimal.Decimal'>, <class 'str'>, <class 'datetime.date'>, <class 'decimal.Decimal'>, <class 'decimal.Decimal'>, <class 'decimal.Decimal'>]
我想做一个类似于 isinstance() 的布尔测试：
[isinstance(x, str) for x in l]
但是 isinstance() 只接受对象而不是 classes.
我想要的结果，对于上面的列表来测试 class 是否是一个字符串，应该是这样的：
[True, True, True, True, False, False, False, True, False, False, False, False]
使用==运算符：
[x == str for x in l]
由于您有 类 的列表，因此您需要使用 issubclass rather than isinstance:
[issubclass(x, str) for x in l]
来自 Python 文档：
issubclass(class, classinfo)Return
Trueif class is a subclass (direct, indirect, or virtual) ofclassinfo. A class is considered a subclass of itself.classinfomay be a tuple of class objects or a Union Type, in which case returnTrueif class is a subclass of any entry inclassinfo. In any other case, aTypeErrorexception is raised.