name = input('your name:')
gender = input('you are a boy?(y/n)')
###### 输入 ######
your name:Runsen
you are a boy?：y
welcome_str = 'Welcome to the matrix {prefix} {name}.'
welcome_dic = {
    'prefix': 'Mr.' if gender == 'y' else 'Mrs',
    'name': name
}
print('authorizing...')
print(welcome_str.format(**welcome_dic))
########## 输出 ##########
authorizing...
Welcome to the matrix Mr. Runsen.

a = input()
1
b = input()
2
print('a + b = {}'.format(a + b))
########## 输出 ##############
a + b = 12
print('type of a is {}, type of b is {}'.format(type(a), type(b)))
########## 输出 ##############
type of a is <class 'str'>, type of b is <class 'str'>
print('a + b = {}'.format(int(a) + int(b)))
########## 输出 ##############
a + b = 3

Mr. Johnson had never been up in an aerophane before and he had read a lot about air accidents, so one day when a friend offered to take him for a ride in his own small phane, Mr. Johnson was very worried about accepting. Finally, however, his friend persuaded him that it was very safe, and Mr. Johnson boarded the plane.
His friend started the engine and began to taxi onto the runway of the airport. Mr. Johnson had heard that the most dangerous part of a flight were the take-off and the landing, so he was extremely frightened and closed his eyes.
After a minute or two he opened them again, looked out of the window of the plane, and said to his friend。
"Look at those people down there. They look as small as ants, don't they?"
"Those are ants," answered his friend. "We're still on the ground."

import re
# 你不用太关心这个函数
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)
    
    # 生成单词和词频的字典
    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))
########## 输出 (省略较长的中间结果) ##########

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))
original_params = json.loads(params_str)
print('after json deserialization')
print('type of original_params = {}, original_params = {}'.format(type(original_params), original_params))
########## 输出 ##########
after json serialization
type of params_str = <class 'str'>, params_str = {'symbol': '123456', 'type': 'limit', 'price': 123.4, 'amount': 23}
after json deserialization
type of original_params = <class 'dict'>, original_params = {'symbol': '123456', 'type': 'limit', 'price': 123.4, 'amount': 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))
########## 输出 ##########
after json deserialization
type of original_params = <class 'dict'>, original_params = {'symbol': '123456', 'type': 'limit', 'price': 123.4, 'amount': 23}