1. 
testfile = open('the_six_wans.txt','r')
word = testfile.read()
ls = [0]*26
for i in word:
    if i.isalpha():
        x = i.lower()
        ls[ord(x) - 97] += 1
print(ls)
testfile.close()

2. testfile = open('the_six_wans.txt','r')
word = testfile.read()
dic = {}
for i in word:
    if i.isalpha():
        x = i.lower()
        if x in dic:
            dic[x] += 1
        else:
            dic[x] = 1
print("本文档一共出现了%d个字母"%len(dic),"统计如下：")
# print(dic)
print(sorted(dic.items()))

testfile.close()

3. testfile = open('the_six_wans.txt','r')
word = testfile.read()
dic = {}
for i in word:
    if i.isalpha():
        x = i.lower()
        if x in dic:
            dic[x] += 1
        else:
            dic[x] = 1
print("本文档一共出现了%d个字母"%len(dic),"统计如下：")
# print(dic)
print(sorted(dic.items()))

testfile.close()

4. 
testfile = open('the_six_wans.txt','r')
worddic = {}
dic = {}
for i in word:
	sword = line.strip().split()
	for word in sword:
		if word in worddic:
			worddic[word] += 1
		else:
			worddic[word] = 1
print("本文档出现了%d次不同的单词"%len(worddic),"统计如下：")
print(worddic)
testfile.close()