Python-列表练习

1、使用列表生成式生成如下列表：[1,9,25,49,81]

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

 1 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()
 2 num =len(s)
 3 x =list()
 4 for i in range(0,num):
 5        x.append(len(s[i]))
 6 average =sum(x)/len(x)     
 7 print(x)
 8 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。

 1 s = input("请输入一组数据，逗号作为分隔符").split(',')
 2 num = len(s)
 3 x = list()
 4 for i in range(0,num):
 5        x.append(int(s[i]))
 6 average = sum(x)/len(x)
 7 maxx = max(x)
 8 minx = min(s)
 9 list.sort(x)
10 print("数据的平均值为",average)
11 print("数据的最大值为",maxx)
12 print("数据的最小值为",minx)
13 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

 1 #Calhamlet
 2 def getText():
 3        txt = open("D:hamlet.txt","r").read()
 4        txt = txt.lower()
 5        for ch in '!"#%@^&*():?/{}[]\_+,.~`<>|"’':
 6            txt = txt.replace(ch," ")
 7        return txt
 8 hamletTxt = getText()
 9 words = hamletTxt.split()
10 counts = {}
11 for word in words :
12        counts[word] = counts.get(word,0) +1
13 items = list(counts.items())
14 items.sort(key=lambda x:x[1],reverse = True)
15 for i in range(10):
16        word,count = items[i]
17        print("{0:<10}{1:>5}".format(word,count))
18