1、怎么查出通过 from xx import xx 导⼊的可以直接调用的方法?
a. 去官网看文档。可以用【对象名称.__doc__】查看。
import scipy
print scipy.quiver.__doc__
b. 使用 Python 下的 help 指令。如:
import numpy # import相应的包
print help(numpy.title) # help(包.函数)
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. """
from collections import Counter
language = ['PHP', 'PHP', 'Python', 'PHP', 'Python', 'JS', 'Python', 'Python','PHP', 'Python']
print(Counter(language))
print(Counter(language).most_common(1))
3. 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:
"""
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
4. 编写Python程序以选择指定年份的所有星期日。
"""
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
a = int(input())
def all_sundays(year):
dt1=datetime.date(a,1,1)
dt2=datetime.date(a,12,31)
for i in range((dt2-dt1).days+1):
day=dt1+datetime.timedelta(days=i)
b=day.isoweekday()
if b==7:
print(day)
else:
continue
all_sundays(a)