periodic 2.1.1

将元素作为对象检索

>>> from periodic import element
>>> hydrogen = element('hydrogen')
>>> hydrogen.mass
1.0079

高级数据库查询（使用sqlalchemy）

>>> from periodic.table import session, Element
>>> session.query(Element).order_by(Element.mass).all()[-4:]  # 4 heaviest elements (by mass)
[<Element('Uup', '115')>, <Element('Uuq', '114')>, <Element('Uuh', '116')>, <Element('Uuo', '118')>]

ascii表

>>> import periodic
>>> print periodic.table
  -----                                                               -----
1 | H |                                                               |He |
  |---+----                                       --------------------+---|
2 |Li |Be |                                       | B | C | N | O | F |Ne |
  |---+---|                                       |---+---+---+---+---+---|
3 |Na |Mg |3B  4B  5B  6B  7B |    8B     |1B  2B |Al |Si | P | S |Cl |Ar |
  |---+---+---------------------------------------+---+---+---+---+---+---|
4 | K |Ca |Sc |Ti | V |Cr |Mn |Fe |Co |Ni |Cu |Zn |Ga |Ge |As |Se |Br |Kr |
  |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
5 |Rb |Sr | Y |Zr |Nb |Mo |Tc |Ru |Rh |Pd |Ag |Cd |In |Sn |Sb |Te | I |Xe |
  |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
6 |Cs |Ba |LAN|Hf |Ta | W |Re |Os |Ir |Pt |Au |Hg |Tl |Pb |Bi |Po |At |Rn |
  |---+---+---+------------------------------------------------------------
7 |Fr |Ra |ACT|
  -------------
              -------------------------------------------------------------
   Lanthanide |La |Ce |Pr |Nd |Pm |Sm |Eu |Gd |Tb |Dy |Ho |Er |Tm |Yb |Lu |
              |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---|
   Actinide   |Ac |Th |Pa | U |Np |Pu |Am |Cm |Bk |Cf |Es |Fm |Md |No |Lw |
              -------------------------------------------------------------

交互式shell（控制台脚本）

Periodic提供了一个名为“Periodic”的控制台脚本。

目前仅限于周期表引用。

在未来，它将能够与元素！

这个交互式shell也可以从python解释器调用：

>>> import periodic
>>> periodic.interactive_shell()

或从命令行：

$ periodic

Enter any of the following periodic values of the element you are looking for:
        ['atomic', 'symbol', 'name', 'mass']

Use ^C or type 'exit' to exit.
========================================================================
> 12
atomic: 12
symbol: Mg
name: Magnesium
mass: 24.305
========================================================================
> uranium
atomic: 92
symbol: U
name: Uranium
mass: 238.02891
========================================================================
> H
atomic: 1
symbol: H
name: Hydrogen
mass: 1.00794
========================================================================
> 15.9994
atomic: 8
symbol: O
name: Oxygen
mass: 15.9994
========================================================================