python 模块

　　编写一个进度条

#!/usr/bin/env python3

import sys, time
for i in range(31):
    sys.stdout.write('
')#每次固定在开头,清空原行
    sys.stdout.write("%s\%% | %s" % (int(i / 30 * 100), int(i / 30 * 100) * "*"))#int(i / 30 * 100) * "*"代表打印多少个*
    sys.stdout.flush()#强制刷新屏幕
    time.sleep(0.3)#等待多少秒

import sys,time
for i in range(1,100):
    if i < 9:#判断是否是占两位数
        sys.stdout.write('#'+'%'+str(i+1)+"")#进度条退两格，为连接下一个#腾地方
        sys.stdout.flush()#刷新显示
        time.sleep(0.5)
    else:
        sys.stdout.write('#' + '%' + str(i + 1) + "")
        sys.stdout.flush()
        time.sleep(0.5)

time.sleep(5)
print("wake up ....")
print(time.time())#时间戳1970 1 1到现在的过去多少秒
print(time.ctime())#返回当前时间
print(time.ctime(time.time()-86400))#将时间转换成字符串昨天的这个时间
time_obj=time.gmtime(time.time()-86400)
print(time_obj)
print("%d-%f-%s %s:%s" % (time_obj.tm_year,time_obj.tm_mon,time_obj.tm_mday,time_obj.tm_hour,time_obj.tm_min)) #格式化
# import sys
"""

wake up ....
1507429553.1381178
Sun Oct 8 10:25:53 2017
Sat Oct 7 10:25:53 2017
time.struct_time(tm_year=2017, tm_mon=10, tm_mday=7, tm_hour=2, tm_min=25, tm_sec=53, tm_wday=5, tm_yday=280, tm_isdst=0)
2017-10.000000-7 2:25

"""

import datetime
print(datetime.datetime.now())#返回当前系统时间
print(datetime.date.fromtimestamp(time.time()))#时间戳直接转成日期格式
print(datetime.datetime.now() + datetime.timedelta(3))#当前时间加三天
print(datetime.datetime.now() + datetime.timedelta(-3))#当前时间减三天
print(datetime.datetime.now() + datetime.timedelta(hours=3))#当前时间加3小时
print(datetime.datetime.now() + datetime.timedelta(minutes=30))#当前时间加30分钟
"""
运行结果

2017-10-08 11:11:59.362852
2017-10-08
2017-10-11 11:11:59.362852
2017-10-05 11:11:59.362852
2017-10-08 14:11:59.362852
2017-10-08 11:41:59.362852

"""

 sys模块

sys.path()其中有一个目录Python35\lib\site-packages将写好的py放入其中，import 就可以导入，一般import导入则在当前目录，如果想在任何地方都可以导入就放入site-packages中

sys.argv运行后面带的参数

import sys
print(sys.path)
print(sys.argv)
if sys.argv[1] == 'sleep':
    print("hello")
else:
    print("wakeup")
"""

H:python17w4>python timemodle.py sleep
['timemodle.py', 'sleep']
hello

H:python17w4>python timemodle.py sleep
['H:\python17\w4', 'C:\Python27\lib\site-packa
ges\paramiko-1.13.0-py2.7.egg', 'C:\Windows\syst
em32\python27.zip', 'C:\Python27\DLLs', 'C:\Pyt
hon27\lib', 'C:\Python27\lib\plat-win', 'C:\Py
thon27\lib\lib-tk', 'C:\Python27', 'C:\Python27
\lib\site-packages']
['timemodle.py', 'sleep']

 如果想安装django

在Scripts目录中找到pip.exe

在命令行中运行pip.ext install django

卸载pip.exe uninstall django

pickle模块

dumps

loads

初始化，写一个字典存起来

#!/usr/bin/env python3
import pickle
account_dic={
    1000:{
        'name':"aric",
        'passwod':'123',
        'bank_acc':1234556,
        'balance':15000
    },

    1001: {
        'name': "robert",
        'passwod': '456',
        'bank_acc': 334589,
        'balance': 15000
    },

}
f=open('accout.db','wb')
f.write(pickle.dumps(account_dic))#与pickle.dumps(account_dic,f)相同
  #f.write(bytes(json.dumps(account_dic),encoding='utf-8'))#如果用json

f.close()

修改balance程序

#!/usr/bin/env python3
import pickle
file_name='accout.db'
f=open(file_name,'rb')
account_dic=pickle.loads(f.read())
f.close()
account_dic[1000]['balance'] -=500
print(account_dic)
f1=open(file_name,'wb')
f1.write(pickle.dumps(account_dic))
f1.close()

查看之后数据修改的情况

#!/usr/bin/env python3
import pickle
f=open('accout.db','rb')
account_db = pickle.loads(f.read())#可用account_db=picle.load(f)
#account_dic=json.loads(f.read().decode("utf-8"))如果用json

print(account_db)

 json将字典写入文件中

import json
data={101:101,102:"cat"}
f=open('db','w',encoding='utf-8')
json.dump(data,f)
f.close()

读文件

#!/usr/bin/env python3
import json
# data={101:101,102:"cat"}
# f=open('db','w',encoding='utf-8')
# json.dump(data,f)
# f.close()
f=open('db','r',encoding='utf-8')
#n=json.loads(f.read())
n=json.load(f)
print(n)
f.close()