Python中非常大的Numbrs

Question

我的理解是python可以处理任意长度的整数.它很好地处理加法和乘法,但似乎与分裂分开.

>>> from decimal import Decimal, getcontext
>>> getcontext().prec=2**5 
>>> ORIG_NUM=476939688738611836995535477357070857939902076027788232031989775824606225595773435668861833
>>> print(Decimal(ORIG_NUM)/7)
6.8134241248373119570790782479582E+88
>>> print("%.6f" % (Decimal(ORIG_NUM)/7))
68134241248373123068520468160885027682039120236463560535175757714209021725053511199096832.000000

我不希望e符号因此getcontext().prec尝试.还有,%f丢弃小数？

>>> getcontext().prec=2**7
>>>QUOTIENT= (Decimal(476939688738611836995535477357070857939902076027788232031989775824606225595773435668861833)/7)

>>>print(QUOTIENT)
68134241248373119570790782479581551134271725146826890290284253689229460799396205095551690.428571428571428571428571428571428571429
>>>QUOTIENT*7
4.7693968873861185e+89
>>> Decimal(QUOTIENT)*7
Decimal('476939688738611861479643277126195193774273841655244923746230303999463152075374578393677824')
>>> print(Decimal(QUOTIENT)*7)
476939688738611861479643277126195193774273841655244923746230303999463152075374578393677824
>>> print(Decimal(QUOTIENT)*7)==ORIG_NUM
476939688738611861479643277126195193774273841655244923746230303999463152075374578393677824
False

第二个问题是数字不匹配.

有关该主题的任何信息？

希望更好......

Answer 1

1. print(Decimal(QUOTIENT)*7)==ORIG_NUM失败,因为print函数返回None.

2. 如果您想要精确划分,请使用Fraction该类.

   >>> from fractions import Fraction
   >>> x = 476939688738611836995535477357070857939902076027788232031989775824606225595773435668861833
   >>> f = Fraction(x, 7)
   >>> print(f)
   476939688738611836995535477357070857939902076027788232031989775824606225595773435668861833/7
   >>> f * 7 == x
   True