Internal numbers of objects are not same by id() as the book showed about data_science_tool_book_code HOT 2 CLOSED

Python 2.7.14 (v2.7.14:84471935ed, Sep 16 2017, 20:25:58) [MSC v.1500 64 bit (AM
D64)] on win32

from data_science_tool_book_code.

I think this issue could be closed now, as I found the reason why this happened. The final internal numbers of the variable depend on the types of the object numbers they are assigned,

• if the number which is assigned to variable is integer number, the result will be like the book showed - the variables will be assigned the same internal numbers as the integer number:

id(7)
93874755162328
usd_to_cny=7
id(usd_to_cny)
93874755162328
dollar_rate=7
id(dollar_rate)
93874755162328
dollar_rate=usd_to_cny=7
id(7)
93874755162328
id(dollar_rate)
93874755162328
id(usd_to_cny)
93874755162328

• if the number which is assigned to variable is fractional number, the result will NOT be like the book showed - the variables will be assigned the internal numbers as the fractional number, at the same time, the fractional number will get another internal number:

id(6.188)
93874755233432
usd_to_cny=6.188
id(6.188)
93874755233456
id(usd_to_cny)
93874755233432
dollar_rate=6.188
id(6.188)
93874755233480
id(dollar_rate)
93874755233456
dollar_rate=usd_to_cny=6.188
id(6.188)
93874755233432
id(dollar_rate)
93874755233480
id(usd_to_cny)
93874755233480

Another found while I doing the test is: I found all the fractional numbers are using the same internal numbers:

id(6.639)
93874755233456
id(6.63)
93874755233456
id(6.6)
93874755233456
id(6.0)
93874755233456
id(6)
93874755162352
id(5.5)
93874755233456
id(5.1)

from data_science_tool_book_code.