python 8 模块

1.自定义模块及调用

模块一：

name = 'yyy'


def info():
    print('day day up')

模块二：

name = 'lll2'
age = 16


def info():
    print('day up 2')

函数

import my_info
print(my_info.name)
my_info.info()

print('-'*40)

import my_info as a
print(a.name)
a.info()

print('-'*40)

from my_info import name
print(name)

print('-'*40)

from my_info import *
print(name)
info()

# 若函数同名，后面的函数会将前面的覆盖

import my_info
import my_info2
print(my_info.name)
my_info2.info()

2.包

learning1:

import admin.Jan as a
print(a.name)

print('-'*40)

from admin import Jan as b
b.info()
# 导入admin包，init代码只执行一次

print('-'*40)

from admin.Jan import name
print(name)

print('-'*40)

from admin.Jan import *
info()

主程序运行

用main 后，阻止代码运行

3. 内置模块

random

import random
random.seed(10)
print(random.random())
print(random.random())

random.seed(10)
print(random.randint(1,100))

for i in range(10):
    print(random.randrange(1, 20, 3))

print('-'*40)

lst = [i for i in range(1, 11)]
print(random.choice(lst))

random.shuffle(lst)
print(lst)

time

import time
now = time.time()
print(now)   # 时间戳

obj = time.localtime()
print(obj)

obj2 = time.localtime(60)
print(obj2)

print(obj2.tm_year)
print(obj2.tm_wday)  # [0,6]表示周一到周天
print(time.ctime())

print(time.strftime('%Y-%m-%d', time.localtime()))
print(time.strftime('%H:%M:%S', time.localtime()))
print(time.strftime('%B', time.localtime()))
print(time.strftime('%A', time.localtime()))

print(time.strptime('2009-09-09', '%Y-%m-%d'))

time.sleep(5)  # 程序等待5s,后继续执行
print('hello world') 

datetime

from datetime import datetime
dt = datetime.now()
print(dt)

# datetime 是一个类，手动创造这个类的对象
dt2 = datetime(2050, 10, 1, 2, 1)
print(dt2, type(dt2))
print(dt2.year)

#  可以比较两个datetime的大小

#  与字符串之间的转换
nowdt = datetime.now()
nowdt_str = nowdt.strftime('%Y/%m/%d %H %M %S')
print(type(nowdt), nowdt)
print(type(nowdt_str), nowdt_str)

timedelta 

from datetime import datetime
from datetime import timedelta

delta1 = datetime(2030,10,1)-datetime(2028,5,5)
print(type(delta1), delta1)

#  通过传入参数的方式创建一个timedelta对象
td1 = timedelta(10, 33)
print(td1)