1.打印进度条
import sys,time
for i in range(20):
sys.stdout.write("#")
sys.stdout.flush() #不等缓冲区满就打印输出
time.sleep(0.1)
2. "r+", "w+", "a+" ,"rb" 读写模式， 写读模式， 追加读写模式， 二进制读写模式（一般用于网络传输）
3. with 用法
Sytanx ''' with open("file1.txt") as obj1, open("file2.txt") as ojb2: '''
with 用于避免忘记关闭文件而生
with open("lyric.txt", "r", encoding="utf-8") as f,\
open("lyric_2.txt", "r", encoding="utf-8") as f2:
for line in f:
print(line)