Python文件操作

Posted 2021-11-03 iamjames

#读模式
f = open("abc.txt","r",encoding="utf-8")
dat = f.read()
print(dat)
f.close()
#写模式（覆盖）
f_write = open("abc.txt","w",encoding="utf-8")
f_write.write("111 222 333 5555")
f.close()
#追加模式
f_add = open("abc.txt","a",encoding="utf-8")
f_add.write("\n888\n")
f.close()

#句柄
with open("abc.txt","r",encoding="utf-8") as f_read1,        open("abc.txt","a",encoding="utf-8") as f_add1:
    print(f_read1.read())
    print(f_add1.write("989800000\n"))

#从哪个字节开始读

f_read1.seek()

#截取，截取多少个字节，其实就是写

f_write.truncate()

#read很特殊，5不一定代表5个字节

f_read1.read(5)

#光标所在的位置

f_read1.tell()