Task08:模块与datetime模块(2天)

练习题

1、怎么查出通过 from xx import xx导⼊的可以直接调⽤的⽅法?

help

2、了解Collection模块,编写程序以查询给定列表中最常见的元素。


题目说明:

输入:language = ['PHP', 'PHP', 'Python', 'PHP', 'Python', 'JS', 'Python', 'Python','PHP', 'Python']

输出:Python


from collections import Counter
def most_element(language):
    """ Return a list of lines after inserting a word in a specific line. """
    m=Counter(language)
    for key,value in m.items():
        if(value == max(m.values())):
            return key
    
language = ['PHP', 'PHP', 'Python', 'PHP', 'Python', 'JS', 'Python', 'Python','PHP', 'Python']
print(most_element(language))


datetime练习题

1、假设你获取了用户输入的日期和时间如2020-1-21 9:01:30,以及一个时区信息如UTC+5:00,均是str,请编写一个函数将其转换为timestamp:

题目说明:

"""
   
Input file
example1: dt_str='2020-6-1 08:10:30', tz_str='UTC+7:00'
example2: dt_str='2020-5-31 16:10:30', tz_str='UTC-09:00'
   
Output file
result1: 1590973830.0
result2: 1590973830.0
"""
   
   
def to_timestamp(dt_str, tz_str):
    # your code here
        pass

2、编写Python程序以选择指定年份的所有星期日。

题目说明:

"""
   
Input file
   2020
   
Output file
   2020-01-05                         
   2020-01-12              
   2020-01-19                
   2020-01-26               
   2020-02-02     
   -----
   2020-12-06               
   2020-12-13                
   2020-12-20                
   2020-12-27 
"""
import datetime
import re

def to_timestamp(dt_str, tz_str):
    dt1=datetime.datetime.strptime(dt_str, '%Y-%m-%d %H:%M:%S')
    utc_group = re.match(r'([UTC]+)([+-])(\d+):(\d)',tz_str)#字符串匹配,分组
    i = int(utc_group.group(3))#时区数字
    if utc_group.group(2) == '+':#时区正负号
        tz_utc = timezone(timedelta(hours=i))
    elif utc_group.group(2) == '-':
        tz_utc = timezone(timedelta(hours=-i))
    dt = dt1.replace(tzinfo=tz_utc)
    return dt.timestamp()

dt_str = input("请输入日期和时间(格式:1990-1-1 00:00:00):")
tz_str = input("请输入时区信息(格式:UTC+7:00):")
print(to_timestamp(dt_str,tz_str))
    
posted @ 2020-08-07 21:29  chenweibo  阅读(68)  评论(0编辑  收藏