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Sep 7, 2015 Replied to a topic by thought › Python › python 关于计算的一个怪异问题 |
遇到这种情况，使用
>>> from decimal import Decimal
>>> Decimal ('1.45') - 1
Decimal ('0.45')
>>> (Decimal ('1.45') - 1 ) * 2
Decimal ('0.90')
>>> from decimal import Decimal
>>> Decimal ('1.45') - 1
Decimal ('0.45')
>>> (Decimal ('1.45') - 1 ) * 2
Decimal ('0.90')
Aug 6, 2015 Replied to a topic by pc10201 › Python › 如何绕过 django 的惰性查询(lazy query)机制? |
你是不是用了queryset.iterator()？使用iterator()无法生成cache，遍历同一个queryset时会重复执行查询。
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