10th step for python:file operate (open ,read, write, close) && file operter && windows control && c

1. open ,operte,close

fp = open ( "a.txt" , "r+" )

fw = open ( "b.txt" , "w" )

a = fp.read()

print (a)

s = "aaaaaa"

fw.write(a) #this opertor will be excuted when the file closed,is not imediately to do.

fw.flush() #if we want to inmediately to write it to file in stead of in the end_time to write,

fp.close()

fw.close()

print ( "你好" )

#readline()

a.seek(0)#set the index to start position

another way to open file,it will be automatic to closed the strem for open fil e:

with open(path, "r", encoding="utf-8") as f :

    print("11111"+ f.read())

2. file and dirctory operte

os.rename('./1.txt','./nih/1.txt')

print(os.stat('./1.txt'))#show the information of the file

os.system('notepad')

print(os.path.abspath('.'))

# str1 = ''

# str2 =''

# os.path.join(str1,str2)

# path2=''

# print(os.path.split(path2))

path = "./1.txt"

os.path.isfile(path)#the file exist

path2 = "./nihao/"

os.path.exists(path2)#the dirctory exist

os.path.getsize(path)

os.path.dirname(path)

os.path.basename(path)#get file's name

3. code format

# coding=gbk

# conding=utf8

# *-* conding=gbk *-*

#-!- coding: gbk -!-

4. windows control

import win32con

import win32gui

import time

QQWin = win32gui.FindWindow("TXGuiFoundation", "TIM")

while True:

    win32gui.ShowWindow(QQWin, win32con.SW_SHOW)

    time.sleep(2)

    win32gui.ShowWindow(QQWin, win32con.SW_HIDE)

    time.sleep(2)

# -!- coding: gbk -!-

import win32con

import win32gui

import time,random

import win32com.client

# while True:

#     QQWin = win32gui.FindWindow("TXGuiFoundation", "TIM")

#     win32gui.ShowWindow(QQWin, win32con.SW_SHOW)

#     time.sleep(2)

#     win32gui.ShowWindow(QQWin, win32con.SW_HIDE)

#     time.sleep(2)

# while True:

#     time.sleep(2)

#     x =random.randint(0,900)

#     y = random.randint(0,800)

#     QQWin = win32gui.FindWindow("TXGuiFoundation", "TIM")

#     win32gui.SetWindowPos(QQWin,win32con.HWND_TOPMOST,x,y,20,10,win32con.SWP_SHOWWINDOW )

speak = win32com.client.Dispatch("SAPI.SPVOICE")

speak.Speak("nihao , woshisahua你好")

5. encode and decode

python 3.6 does have the decode function

#-!- coding: gbk -!-

with open(path2,"wb") as f1 :

    str = "sdfd你好"

    f1.write(str.encode('gbk'))

with open(path2, "r") as f2 :

    a = f2.read()

    print("%s"%a)

6. instant data

import pickle

mylist=(1,2,3,4,5)

path = ...

f = open(path,"wb")

pickle.dimp(mylist,f)

f.close()

f2 = open(path,"rb")

m.list = pickle.load(f2)

f2.close()

7. eval

eval(str)

it makes "str" a excute sentence

like :

srt = "print(\"nihao\")"

eval(srt)

the same to 

print("nihao")

str = 1

while str != " " :

    try:

        str = input("输入命令")

        print(eval(str))

    except SyntaxError:

        pass

if we input :

__import__('os').system("dir")

will show the directory like use "dir" in system console does.