文件的操作_文件的快捷键

#data = open("sql do",encoding="utf -8").read()
#f = open("sql do",'r',encoding="utf-8")#文件句柄
#W 是创建一个文件，会覆盖
#f.read()
#print (data)
'''
f = open("sql2 do",'w',encoding="utf-8")

f.write("我 爱 昊 昊，\n")
f.write("我 爱 大 宝")
'''
f = open("sql2 do",'a',encoding="utf-8")#不覆盖原文件
f.write("\n 我 爱 妈 妈，\n")
f.write("我 爱 姐 姐")
f.close()#关闭
#print (f)
'''
f = open("sql2 do",'r',encoding="utf-8")
#打印多少行
for i in range(5):
    print(f.readline())
 '''
"""
f = open("sql do",'r',encoding="utf-8")
for i in range(10):
    if i > 5:
        print(f.readline())
    else:
        f.readline()
        continue
打印5-10行
"""
"""
N=10
f = open("sql do",'r',encoding="utf-8")
for i in range(N):
    print (f.readline())
f.close()
"""
"""
low loop 
f = open("sql do",'r',encoding="utf-8")
for index,line in enumerate(f.readlines()):
    if index == 9:
        print('-------这个是个分隔符----------')
        continue
    else:
        print (line.strip())
        #多少行不答应，strip是去掉空格，中间换行
"""
"""
#high  loop,一行行取到内存
f = open("sql do",'r',encoding="utf-8")
count = 0
for line in f: #打印只保留一行
     if count == 9:
         print("----你是傻逼-------")
         count += 1
         continue
     else:
        print (line.strip())
     count += 1
"""
"""
tell()光标位置
read()字符
seek()会到某个地方,是字符
enconding#字符编码
flush  #刷新到程序
"""
"""
#进度条
import sys,time
for i in range (20):
    sys.stdout.write("#")
    sys.stdout.flush()
    time.sleep(1)
"""
"""
文件的读写 R+ #文件最后一行
文件的写读W+   #创建新文件在读，还是追加在最后一行 
rb #二进制------网络传输
"""

"""
#修改文件的内容
f = open ("sql do",'r',encoding="utf-8")
f_new = open ("sql_new do",'w',encoding="utf-8")
for line in f:
    if "删除" in line:
        line = line.replace("删除","添加")
    f_new.write(line)
f.close()
f_new.close()
"""

"""
#使用with
with open ("sql do",'r',encoding="UTF-8") as f:#等于 f= openXXXXXXX
#钙语句不需要执行关闭
#打开多个文件with open ("new1") as f1,open ("new2") as f2:
"""