请用 Python 语言编写一个简易的计算器程序。
from tkinter import *
reset=True
def buttonCallBack(event):
global label
global reset
num=event.widget['text']
if num=='C':
label['text']="0"
return
if num in "=":
label['text']=str(eval(label['text']))
reset=True
return
s=label['text']
if s=='0' or reset==True:
s=""
reset=False
label['text']=s+num #主窗口
root=Tk() root.wm_title(" 计算器 ") #显示栏 1 label=Label(root,text="0",background="white",anchor="e")
label['width']=35
label['height']=2
label.grid(row=1,columnspan=4,sticky=W) #按钮
showText="789/456*123-0.C+"
for i in range(4):
for j in range(4):
b=Button(root,text=showText[i*4+j],width=7)
b.grid(row=i+2,column=j)
b.bind("",buttonCallBack) showText="()"
for i in range(2):www.jb51.net
b=Button(root,text=showText[i],width=7)
b.grid(row=6,column=2+i)
b.bind("",buttonCallBack) b=Button(root,text="=")
b.grid(row=6,columnspan=2,sticky="we")
b.bind("",buttonCallBack)
root.mainloop()
暂无解析
Ifthedrugproveseffectiveinhumantrials,itcouldenhancetheeffectivenessofexistingAIDSdrugsin________.
Thecompositionscontainedsofewerrorsthattheteachergotthestudents_____oneanother’spapers.
Mostofusaretaughttopayattentiontowhatissaid—thewords.Wordsdoprovideuswithsomeinformation,butmeaningsarederivedfromsomanyothersourcesthatitwouldhinderoureffectivenessasapartnertoarelationshiptorelytooheavilyonwordsalone.Wordsareusedtodescribeonlyasmallpartofthemanyideasweassociatewithanygivenmessage.Sometimeswecangaininsightintosomeofthoseassociationsifwelistenformorethanwords.Wedon’talwayssaywhatwemeanormeanwhatwesay.Sometimesourwordsdon’tmeananythingexcept“I’mlettingoffsomesteam.Idon’treallywantyoutopaycloseattentiontowhatI’msaying.JustpayattentiontowhatI’mfeeling.”Mostlywemeanseveralthingsatonce.Apersonwantingtopurchaseahousesaystothecurrentowner,“ThisstephastobefixedbeforeI’llbuy.”Theownersays,“It’sbeenlikethatforyears.”Actually,thestephasn’tbeenlikethatforyears,buttheunspokenmessageis:“Idon’twanttofixit.Weputupwithit.Whycan’tyou?”Thesearchforamoreexpansiveviewofmeaningcanbedevelopedofexaminingamessageintermsofwhosaidit,whenitoccurred,therelatedconditionsorsituation,andhowitwassaid.
Whenamessageoccurscanalsorevealassociatedmeaning.Letusassumetwocouplesdoexactlythesameamountofkissingandarguing.Butonecouplealwayskissesafteranargumentandtheothercouplealwaysarguesafterakiss.Theorderingofthebehaviorsmaymeanagreatdealmorethanthefrequencyofthebehavior.Afriend’sunusuallydocilebehaviormayonlybeunderstoodbynotingthatitwasprecededbysituationsthatrequiredanabnormalamountofassertiveness.Someresponsesmaybedirectlylinkedtoadevelopingpatternofresponsesanddefylogic.Forexample,apersonwhosays“No!”toaserialsofchargeslike“You’redumb,”“You’relazy,”and“You’redishonest,”mayalsosay“No!”andtrytojustifyhisorherresponseifthenextstatementis“Andyou’regoodlooking.”
Wewoulddowelltolistenforhowmessagesarepresented.Thewords,“Ifsurehasbeennicetohaveyouover,”canbesaidwithemphasisandexcitementorritualistically.Thephrasecanbesaidonceorrepeatedseveraltimes.Andthemeaningsweassociatewiththephrasewillchangeaccordingly.Sometimesifwesaysomethinginfrequentlyitassumesmoreimportance;sometimesthemorewesaysomethingthelessimportanceitassumes.
1.Effectivecommunicationisrenderedpossiblebetweentwoconversingpartners,if___.
A.theyuseproperwordstocarrytheirideas.
B.theybothspeaktrulyoftheirownfeelings.
C.theytrytounderstandeachother’sideasbeyondwords.
D.theyarecapableofassociatingmeaningwiththeirwords.
2.“I’mlettingoffsomesteam”inparagraph1means___.
A.I’mjustcallingyourattention.
B.I’mjustkidding.
C.I’mjustsayingtheopposite.
D.I’mjustgivingoffsomesound.
3.Thehouse-owner’sexampleshowsthatheactuallymeans___.
A.thestephasbeenlikethatforyears.
B.hedoesn’tthinkitnecessarytofixthestep.
C.theconditionofthestepisonlyaminorfault.
D.thecostinvolvedinthefixingshouldbeshared.
4.Someresponsesandbehaviorsmayappearveryillogical,butarejustifiableif___.
A.linkedtoanabnormalamountofassertiveness.
B.seenasone’shabitualpatternofbehavior.
C.takenaspartofanorderingsequence.
D.expressedtoaseriesofcharges.
5.Theword“ritualistically”inthelastparagraphequalssomethingdone___.
A.withouttrueintention.
B.light-heartedly.
C.inawayofceremony.
D.withlessemphasis.
_____forthefactthatshebrokeherleg,shemighthavepassedtheexam.
Iamafraiditwasa____foryoutodothis.
