常用模块练习

常用模块学习

时间模块

import time

一：时间有三种格式（*）

1、时间戳：秒数=>用于时间计算

# start=time.time()
​
# print(start,type(start))

 

2、格式化的字符串=>用于显示给人看

# res=time.strftime("%Y-%m-%d %H:%S:%M %p")
​
# res=time.strftime("%Y-%m-%d %X")
​
# print(res,type(res))

 

3、结构化的时间=>获取时间的某一部分

# res = time.localtime()
​
# res1 = time.gmtime()
​
# print(res,type(res))
​
# print(res.tm_year)
​
# print(res)
​
# print(res1)

 

二：时间转换

2.1 时间戳---》格式化的字符串

# struct_time=time.localtime(3333.3)
​
# res=time.strftime("%Y:%m",struct_time)
​
# print(res)

 

2.2 格式化的字符串---》时间戳

# struct_time=time.strptime("2017-07-03 11:11:11","%Y-%m-%d %H:%M:%S")
​
# res=time.mktime(struct_time)
​
# print(res)

 

三：

# print(time.ctime(3333.3))
​
# print(time.asctime(time.localtime(3333.3)))

 

四：

# time.sleep(3)
​
​
#==========================> datetime模块
import datetime
​
# res=datetime.datetime.now()
​
# print(res)
​
# print(datetime.date.fromtimestamp(time.time()))
​
# print(datetime.datetime.fromtimestamp(time.time()))
​
# res=datetime.datetime.now() + datetime.timedelta(days=3)
​
# res=datetime.datetime.now() + datetime.timedelta(days=-3)
​
# print(res)
​
# res=datetime.datetime.now()
​
# print(res)
​
# new_res=res.replace(year=1999,month=9)

 

print(new_res)

import random

# print(random.random())
​
# print(random.randint(1,3))
​
# print(random.choice([1,'23',[4,5]]))
​
# print(random.sample([1,'23',[4,5]],2))
​
# print(random.uniform(1,3))
​
# item=[1,3,5,7,9]
​
# random.shuffle(item)
​
# print(item)
​
​
# 随机验证码
​
# print(chr(65))
​
# print(chr(90))

1、随机数骰子

def make_code(n=5):
    res = ''
    for i in range(n):
        s1 = str(random.randint(0, 9))
        s2 = chr(random.randint(65, 90))
        res += random.choice([s1, s2])
    return res
​
print(make_code(4))

os 模块

# import os
​
# print(os.listdir("."))
​
# import os
​
# cmd=input(r"""
​
# Microsoft Windows [版本 10.0.17763.1339]
​
# (c) 2018 Microsoft Corporation。保留所有权利。
​
#
​
# %s=====> """ %os.getcwd())
​
# res=os.system(cmd)
​
# print('='*100)
​
# print(res)
​
​
import os
​
# print(__file__)
​
# print(os.path.abspath(__file__))
​
# res=os.path.split("D:/python全栈15期/day21/03 os模块.py")
​
# print(res)
​
# print(os.path.basename("D:/python全栈15期/day21/03 os模块.py"))
​
# print(os.path.dirname("D:/python全栈15期/day21/03 os模块.py"))
​
# print(os.path.exists("D:/python全栈15期/day21/"))
​
# print(os.path.isabs("D:/python全栈15期/day21/"))
​
# print(os.path.isabs("/python全栈15期/day21/"))
​
# print(os.path.isabs("python全栈15期/day21/"))
​
# print(os.path.join("a",'b','D:\c','d.txt'))
​
​
# print(os.path.dirname(os.path.dirname(__file__)))
​
# res=os.path.join(
​
#     __file__,
​
#     "..",
​
#     ".."
​
# )
​
#
​
# print(os.path.normpath(res))

print(os.path.getsize(file))

subprocess模块

import subprocess
​
# pwd ; sasdfasdf ;echo 123
​
obj = subprocess.Popen("diasfdafr", shell=True,
                       stdout=subprocess.PIPE,
                       stderr=subprocess.PIPE
                       )
​
res1=obj.stdout.read()
res2=obj.stderr.read()
​
# print(res1.decode('gbk'))
​
print(res2.decode('gbk'))

import sys

# sys.path
​
# print(sys.argv)
​
# src_file = input("源文件路径：").strip()
​
# dst_file = input("目标文件路径：").strip()
​
# src_file = sys.argv[1]
​
# dst_file = sys.argv[2]
​
#
​
# with open(r"%s" %src_file,mode='rb') as f1,open(r"%s" %dst_file,mode='wb') as f2:
​
#     for line in f1:
​
#         f2.write(line)

实例打印进度条

import time
​
def progress(percent):
    if percent > 1:
        percent=1
    print("\r[%-50s] %d%%" % ("#"*int(50*percent),int(100 * percent)),end='')
​
total_size = 1025
recv_size = 0
​
while recv_size < total_size:
​
    # 每次下载1024
​
•    time.sleep(0.3)
•    recv_size+=1024
​
​
​
percent = recv_size / total_size
​
progress(percent)