f = open('text.txt','w+')
f.write('World')
print('1.创建text.txt文件，World写入文件')
f = open('text.txt','r+')
f.write('Hello')
print('2.打开text.txt文件,Hello覆盖文件内容')
f = open('text.txt','a')
f.write(' ')
print('3.打开text.txt文件,在文件尾部追加空格" "')
fname = '/home/fan/作业/12/text.txt'
f = open(fname,'a+')
f.write('World')
print('4.打开text.txt,在文件尾部追加World')

f_name = 'text.txt'
f = None
try:
    f = open(f_name)
    print('打开文件成功')
    content= f.read()
    print(content)
except FileNotFoundError as e:
    print('文件不存在,请先使用12.1.py程序创建文件')
except OSError as e:
    print('处理OSError异常')
finally:
    if f is not None:
        f.close()
        print('关闭文件成功')

f_name = 'text.txt'
with open('text.txt') as f:
    content = f.read()
    print(content)

f_name = 'src_file.txt'
with open(f_name,'r',encoding ='gbk') as f:
    lines = f.readlines()
    copy_f_name = 'dest_file.txt'
    with open(copy_f_name,'w',encoding = 'utf-8') as copy_f:
        copy_f.writelines(lines)
        print('复制成功')

f_name = 'logo.png'
with open(f_name,'rb') as f:
    b = f.read()
    copy_f_name = 'logo2.png'
    with open(copy_f_name,'wb') as copy_f:
        copy_f.write(b)
        print('文件复制成功')