Python-列表练习

1、使用列表生成式生成如下列表：[1,9,25,49,81]

 s = [i**2 for i in range(1,10)if i%2==1]
 print(s)

2、输入一个由英文单词组成的字符串（分隔符自定），将每个单词的长度计算出来并形成一个新列表，并统计所有单词的平均长度。

 s = input("请输入一个由英文单词组成的字符串，空格作为分隔符").split()
 num =len(s)
 x =list()
 for i in range(0,num):
        x.append(len(s[i]))
 average =sum(x)/len(x)
 print(x)
 print("平均单词长度%d",average)        

3.输入一组数据，以逗号分隔，求出这组数据的平均值、最大值、最小值，并按从小到大顺序排序。

 s = input("请输入一组数据，逗号作为分隔符").split(',')
 num = len(s)
 x = list()
 for i in range(0,num):
        x.append(int(s[i]))
 average = sum(x)/len(x)
 maxx = max(x)
 minx = min(s)
 list.sort(x)
 print("数据的平均值为",average)
 print("数据的最大值为",maxx)
 print("数据的最小值为",minx)
 print("数据从小到大排序为",x)   

4.统计《哈姆雷特》中出现频率最高的几个词

 #Calhamlet
 def getText():
        txt = open("D:\hamlet.txt","r").read()
        txt = txt.lower()
        for ch in '!"#%@^&*():?/{}[]\\_+,.~`<>|"’':
            txt = txt.replace(ch," ")
        return txt
 hamletTxt = getText()
 words = hamletTxt.split()
 counts = {}
 for word in words :
        counts[word] = counts.get(word,0) +1
 items = list(counts.items())
 items.sort(key=lambda x:x[1],reverse = True)
 for i in range(10):
        word,count = items[i]
        print("{0:<10}{1:>5}".format(word,count))