제1 부분 day 5 파일 조작

#-----    -----

       1、"r"   2、"w"      3、"a"    4、"r+"     ，     5、"w+"     ，     6、"a+"     

1 with open("   ","r",encoding="utf-8") as f:
2     data = f.read()
3     print(data)
4     f.close()

readlines   

1 with open("   ","r",encoding="utf-8") as f:
2     data = f.readlines()
3     for i in data:
4         print(i.strip())
5 
6 with open("   1","w",encoding="utf-8") as f:
7     f.write("       。     ，   。       。")

#     6   

 1 with open("   ","r",encoding="utf-8") as f:
 2     # print(f.fileno()) #     #3
 3     num1 = 0
 4     for i in f.readlines():
 5         num1 += 1
 6         if num1 == 6:
 7             i = ''.join([i.strip(),'ok'])
 8         print(i.strip())
 9 
10 with open("   ","r",encoding="utf-8") as f:
11     num1 = 0
12     for i in f:  #for     f          ，      
13         num1 += 1
14         if num1 == 4:
15             i = "".join([i.strip(),"ok"])
16         print(i.strip())

#flush   （      ）

 1 import time,sys
 2 
 3 for i in range(30):
 4     sys.stdout.write("*")
 5     time.sleep(0.2)
 6     sys.stdout.flush()
 7 
 8 for i in range(30):
 9     print("*",end="",flush=True)
10     time.sleep(0.2)

#truncate   

1 with open("   1","a",encoding="utf-8") as f:
2     f.truncate(6) #  

#r+         0  

1 with open("   1","a+",encoding="utf-8") as f:
2     f.write("  ") #      
3     f.close()

#w+   

1 with open("   1","w+",encoding="utf-8") as f:
2     f.write("  ")
3     print(f.tell()) #6
4     f.seek(0)
5     print(f.readline())

#a+           

1 with open("   1","a+",encoding="utf-8") as f:
2     print(f.tell())
3     f.write("  ")
4     print(f.tell())
5     print(f.readline())

#    

 1 # f_read = open("   1",'r',encoding="utf-8")
 2 # f_write = open("   2",'w',encoding="utf-8")
 3 #with           
 4 with open("   1",'r',encoding="utf-8") as f_read,open("   2",'w',encoding="utf-8") as f_write:
 5     num1 = 0
 6     for line in f_read:
 7         num1 += 1
 8         if num1 == 5:
 9             line = "".join([line.strip(),"dream
"])
10         f_write.write(line)
11         print(line.strip())
12     f_write.close()
13     f_read.close()