#!/usr/bin/env python
# coding: utf-8

# In[5]:


name = input('your name: ')
gender = input('your are a boy? (y/n) ')

welcome_str = 'Welcome to the matrix {prefix} {name}.'
welcome_dic = {
    'prefix': 'Mr.' if gender == 'y' else 'Mrs',
    'name': name
}

print('authoring...')
print(welcome_str.format(**welcome_dic))


# In[11]:


a = input()
b = input()

print('a + b ={}'.format(a + b))

print('type of a is {}, type of b is {}'.format(type(a), type(b)))

print('a + b = {}'.format(int(a) + int(b)))


# In[16]:


import json

params = {
    'symbol': '123456',
    'type': 'limit',
    'price': 123.4,
    'amount': 23
}

params_str = json.dumps(params)

print('after json serialization')
print('type of params_str = {}, params_str = {}'.format(type(params_str), params_str))


print('\n')

original_params = json.loads(params_str)

print('after json deserialization')
print('type of original_params = {}, original_params = {}'.format(type(original_params), original_params))


# In[23]:


import json

params = {
    'symbol': '123456',
    'type': 'limit',
    'price': 123.4,
    'amount': 23
}


with open('params.json', 'w') as fout:
    params_str = json.dump(params, fout)
    
with open('params.json', 'r') as fin:
    original_params = json.load(fin)

print('after json deserialization')
print('type of original_params = {}, original_params = {}'.format(type(original_params), original_params))


# In[24]:


import re
def parse(text):
    # 使用正则表达式去除标点符号和换行符
    text = re.sub(r'[^\w]', ' ', text)
    
    # 转为小写
    text = text.lower()
    
    # 生成所有单词的列表
    word_list = text.split(' ')
    
    #去除空白单词
    word_list = filter(None, word_list)
    
    #生成单词和词频词典
    word_cnt = {}
    for word in word_list:
        if word not in word_cnt:
            word_cnt[word] = 0
        word_cnt[word] += 1
    
    # 按照词频排序
    sorted_word_cnt = sorted(word_cnt.items(), key=lambda kv: kv[1], reverse=True)
    
    return sorted_word_cnt

with open('in.txt', 'r') as fin:
    text = fin.read()
    
word_and_freq = parse(text)

with open('out.txt', 'w') as fout:
    for word, freq in word_and_freq:
        fout.write('{} {}\n'.format(word, freq))