这里写目录标题
模快
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？
使用help函数查看里面的FUNCTIONS
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
"""
Input file
language = ['PHP', 'PHP', 'Python', 'PHP', 'Python', 'JS', 'Python', 'Python','PHP', 'Python']
Output file
Python
"""
def most_element(language):
""" Return a list of lines after inserting a word in a specific line. """
# your code here
language = ['PHP', 'PHP', 'Python', 'PHP', 'Python', 'JS', 'Python', 'Python','PHP', 'Python']
def most_element(language):
""" Return a list of lines after inserting a word in a specific line. """
count = 0
unique = set(language)
for u in unique:
if language.count(u) > count:
count = language.count(u)
max_elem = u
return max_elem
most_element(language)
'Python'
datetime模快
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
from datetime import datetime, timedelta, timezone
from dateutil import parser
import re
def to_timestamp(dt_str, tz_str):
dt = parser.parse(dt_str)
utc_group = re.match(r'(UTC)([+-])(\d+):(\d+)', tz_str)
i = int(utc_group.group(3))
if utc_group.group(2) == '+':
tz_utc = timezone(timedelta(hours=i))
elif utc_group.group(2) == '-':
tz_utc = timezone(timedelta(hours=-i))
dt = dt.replace(tzinfo=tz_utc)
return dt.timestamp()
dt_str1, tz_str1 = '2020-6-1 08:10:30', 'UTC+7:00'
dt_str2, tz_str2 = '2020-5-31 16:10:30', 'UTC-09:00'
print(to_timestamp(dt_str1, tz_str1))
print(to_timestamp(dt_str2, tz_str2))
1590973830.0
1590973830.0
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
"""
def all_sundays(year):
# your code here
from datetime import date, timedelta
def all_sundays(year):
year = int(year)
year_start = date(year, 1, 1)
# 找出第一个星期天
year_start += timedelta(days=(7-year_start.isoweekday()))
while year_start.year == year:
print(year_start)
year_start += timedelta(days=7)
all_sundays(2020)
2020-01-05
2020-01-12
2020-01-19
2020-01-26
2020-02-02
2020-02-09
2020-02-16
2020-02-23
2020-03-01
2020-03-08
2020-03-15
2020-03-22
2020-03-29
2020-04-05
2020-04-12
2020-04-19
2020-04-26
2020-05-03
2020-05-10
2020-05-17
2020-05-24
2020-05-31
2020-06-07
2020-06-14
2020-06-21
2020-06-28
2020-07-05
2020-07-12
2020-07-19
2020-07-26
2020-08-02
2020-08-09
2020-08-16
2020-08-23
2020-08-30
2020-09-06
2020-09-13
2020-09-20
2020-09-27
2020-10-04
2020-10-11
2020-10-18
2020-10-25
2020-11-01
2020-11-08
2020-11-15
2020-11-22
2020-11-29
2020-12-06
2020-12-13
2020-12-20
2020-12-27