* pythonの「objectをeval()で再び元のオブジェクトに戻せる文字列に変換して返す。」というrepr(object)関数

* pythonの「objectをeval()で再び元のオブジェクトに戻せる文字列に変換して返す。」というrepr(object)関数

:CATEGORIES: python

Pythonのstr( )とrepr( )の使い分け | ガンマソフト株式会社 https://gammasoft.jp/blog/use-diffence-str-and-repr-python/

```
In [7]: repr(users)
Out[7]: "{'a1', 'motoken_tw', 'uwaaa', 'fukazawas', 'z1', 'lawks', 'lawks2', 'b1'}"

In [8]: print(users)
{'a1', 'motoken_tw', 'uwaaa', 'fukazawas', 'z1', 'lawks', 'lawks2', 'b1'}

In [9]: import datetime

In [10]: today = datetime.date.today()

In [11]: print(today)
2020-09-17

In [12]: repr(today)
Out[12]: 'datetime.date(2020, 9, 17)'

In [13]: today.type
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
in
----> 1 today.type

AttributeError: 'datetime.date' object has no attribute 'type'

In [14]: type(tody)
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
in
----> 1 type(tody)

NameError: name 'tody' is not defined

In [15]: today.type

---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
in
----> 1 today.type

AttributeError: 'datetime.date' object has no attribute 'type'

In [16]: type(today)

Out[16]: datetime.date

In [17]: day = datetime.date(2020, 9, 17)

In [18]: day

Out[18]: datetime.date(2020, 9, 17)

In [19]: print(day)

2020-09-17

In [20]: type(day)

Out[20]: datetime.date
```