first是什么意思

python中箭头是什么意思_python流程框⾥⾯的箭头是什么意

思

2015-05-21回答

你⽤的graphics模块？这不是内置的，虽然它是调⽤内置的tkinter画图。

option可以是"first","last","both"或"none"。见:

deftarrow(lf,option):

ifnotoptionin["first","last","both","none"]:

raigraphicrror(bad_option)

lf._reconfig("arrow",option)

细节要查tk⽂档：

vaslineobject

ingeneral,alinecanconsistofanynumberofgmentsconnectedendtoend,andeachgmentcanbestraightor

teacanvaslineobjectonacanvasc,u:

id=_line(x0,y0,x1,y1,...,xn,yn,option,...)

thelinegoesthroughtheriesofpoints

(x0,

y0),

(x1,

y1),

…

(xn,

yn).

optionsinclude:

arrow=firsttogetanarrowheadatthe(x0,y0)

arrow=

arrow=bothforarrowheadsatbothends.