Python语言程序设计基础（5）—— 组合数据类型，,tuple 元组（创

Python语言程序设计基础（5）—— 组合数据类型，,tuple 元组（创

tuple 元组（创建后不能修改）

tuple = "cat","dog","tiger","human"print(tuple)def fun(x):    return x,x*2print(type(fun(3)))for x,y in ((2,0),(2,5),(3,8)):    print(x+y)

set 集合

S = {435,"BAT",(25,"CS"),435}print(S)W = set("apple")print(W)V = set(("cat",4,"apple"))print(V)

list 列表

ls = [423,"BAT",[10,"CS"]]print(ls[2][1][1])vlist = list(range(5))print(vlist)print("YES") if 2 in vlist else print("NO")lss = [52,36,95,78]print(sorted(lss))print(lss)

字典

sets = {23,35}print(type(sets))setss = {34:23,33:22,23:32}for a in setss.keys():    print(a)ls = setss.items()print(ls)for key in setss:    print(setss[key])

计算平均数，和标准差

import mathdef inputs() :    nums = []    x = input()    while x != "":        nums.append(int(x))        x = input()    return numsls = inputs()print(ls)def mean(numbers):    s = 0    for num in numbers:        s += num    return s / len(numbers)def dev(numbers,means):    sdev = 0    for num in numbers:        sdev += (num-means)**2    return math.sqrt(sdev/(len(numbers)-1))print(dev(ls,mean(ls)))

统计词频（哈利波特1）

txt = open("1.Harry Potter and the Sorcerer‘s Stone.txt","r").read()txt = txt.lower()for ch in ‘",!-?;.`‘:    txt = txt.replace(ch," ")#print(txt)ls = txt.split()print(ls)maps = {}for str in ls:    maps[str] = maps.get(str,0) + 1item = list(maps.items())cnt = 1for a in item :    print(a,end=" ")    if cnt % 10== 0:        print("")    cnt+=1print("")item.sort(key=lambda x:x[1],reverse=True)for i in range(10):    word ,count = item[i]    print(word,count)

Python语言程序设计基础（5）—— 组合数据类型