How to view the type of data in Python

Python view data types

In Python, there are several ways to view the data type of an object:

1. Use type()

Use directlytype()Functions can view the object type:

>>> type(1) 
<class 'int'>
>>> type([])
<class 'list'> 
>>> type(lambda x: x + 1) 
<class 'function'>

2. Use isinstance()

isinstance()You can check whether an object is of a certain type, or a subclass of a certain type:

&gt;&gt;&gt; isinstance(1, int) 
True
&gt;&gt;&gt; isinstance([], list)
True
&gt;&gt;&gt; isinstance(lambda x: x + 1, function)  # function is an alias for typeTrue

3. Check the object's class attribute

Each object has one__class__The property points to the class that created it:

>>> 1.__class__ 
<class 'int'>
>>> [].__class__ 
<class 'list'>
>>> (lambda x: x + 1).__class__
<class 'function'>

4. Use dir()

We can usedir()Functions get the list of properties of an object, which usually contains__class__property:

>>> dir(1)
['__abs__', '__add__', '__and__', '__bool__', '__ceil__', '__class__', '__delattr__', '__dir__', '__divmod__', '__doc__', '__eq__', '__float__', '__floor__', '__floordiv__', '__format__', '__ge__', '__getattribute__', '__getnewargs__', '__gt__', '__hash__', '__index__', '__init__', '__init_subclass__', '__int__', '__invert__', '__le__', '__lshift__', '__lt__', '__mod__', '__mul__', '__ne__', '__neg__', '__new__', '__or__', '__pos__', '__pow__', '__radd__', '__rand__', '__rdivmod__', '__reduce__', '__reduce_ex__', '__repr__', '__rfloordiv__', '__rlshift__', '__rmod__', '__rmul__', '__ror__', '__round__', '__rpow__', '__rrshift__', '__rshift__', '__rsub__', '__rtruediv__', '__rxor__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', '__truediv__', '__trunc__', '__xor__', 'bit_length', 'conjugate', 'denominator', 'from_bytes', 'imag', 'numerator', 'real', 'to_bytes']

You can see,1.__class__Just in this list.

So Python provides multiple ways to check the type of an object, including:

type() function
isinstance() function
__class__property
dir() function

You can select one or more ways to view the object type as needed.

Summarize

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