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))

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Python-列表练习

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