Python Module Summary Exercise

1. Random Module

# print (Random.random ()) # Print (Random.randint (1,3)) # analog Random Verification code def Make_code (n=5):    res=' for in '      Range (n):        S1=str (random.randint (0,9))        S2=chr (Random.randint (65,90))        res+ =  Random.choice ([s1,s2])    return  resprint(Make_code (10))

2. Simulation Printing progress bar

1Num=302 Print('%s%%'%num)3 4 #Print progress bar5Width=506 Print(('[%%-%ds]'%width)%'#')7 Print(('[%%-%ds]'%width)%'##')8 Print(('[%%-%ds]'%width)%'###')9 Print(('[%%-%ds]'%width)%'####')Ten  One defProgress (percent,width=50): A     ifPercent > 1: -Percent=1 -Show_str= (('[%%-%ds]'%width)% (int (width*percent) *'#')) the     Print('\r%s%d%%'% (Show_str,int (100*percent)), end=' ') -  - ImportTime,random -Recv_size=0 +total_size=8097 -  whilerecv_size<total_size: +Time.sleep (0.5) Arecv_size+=1024 atPercent=recv_size/total_size -Progress (percent)

3. Shelve Module (serialization)

1 Importshelve2 3 #Serialization of4info1={' Age': 18,'Herght': 180,'Weight': 80}5info2={' Age': 88,'Herght': 150,'Weight': 80}6 7D=shelve.open ('DB.SHV')8d['Egon']=Info19d['Alex']=Info2Ten d.close () One  A #deserialization -D=shelve.open ('DB.SHV') - Print(d['Alex']) the Print(d['Egon']) - d.close () -  -  + #Modifying Data -D=shelve.open ('DB.SHV', writeback=True) + #d[' Alex ' [' Age ']=10000 A Print(d['Alex']) atD.close ()

4. XML module

1 ImportXml.etree.ElementTree as ET2Tree=et.parse ('A.xml')3root=tree.getroot ()4 5 #======================================== ""6 #three ways to find nodes7Res=root.iter ('Rank')#is searched throughout the tree, and it is the search for all8  forIteminchRes:9     #print (item)Ten     Print('='*50) One     Print(Item.tag)#Label name A     Print(Item.attrib)#Properties -     Print(Item.text)#text content -  the  -Res=root.find ('Country')#can only be found at the next level of the current element, and only one - #print (Res.tag) - #print (Res.attrib) + #print (Res.text) -N=res.find ('Rank') + Print(N.attrib) A  at  -  -Res=root.findall ('Country')#can only be found at the next level of the current element, - Print([Item.tag forIteminchRes]) -  -  in  - #===================================== "" Changed to ImportXml.etree.ElementTree as ET +Tree=et.parse ('A.xml') -root=tree.getroot () the  *  forYearinchRoot.iter (' Year'): $YEAR.TEXT=STR (int (year.text) +10)Panax Notoginsengyear.attrib={'Updated':'Yes'} -Tree.write ('A.xml') the  +  A  the #=============================== "Increased + ImportXml.etree.ElementTree as ET -Tree=et.parse ('A.xml') $root=tree.getroot () $  -  forCountryinchRoot.iter ('Country'): -     #print (' year ') theYear=country.find (' Year') -     #print (year)Wuyi     ifInt (year.text) > 2010: the         #print (Country.attrib) -         #Ele=et. Element (' Egon ') Wu         #ele.attrib={' nb ': ' Yes ' -         #ele.text= ' good ' About         #country.append (ele) $ Country.remove (year) -  -Tree.write ('B.xml')

2018-08-15 22:54:40

Python Module Summary Exercise