1、通用文件copy工具实现
src_file = input('请输入源文件地址:').strip()
dsc_file = input('请输入目标地址:').strip()
with open(r'{}'.format(src_file), mode='rb')as f1,
open(r'{}'.format(dsc_file), mode='wb')as f2:
for line in f1:
f2.write(line)
2、基于seek控制指针移动,测试r+、w+、a+模式下的读写内容
r+模式 的模式 0:
with open('c.txt', mode='r+t', encoding='utf-8')as f:
l = ['中国
','hello
','haha
']
f.seek(3, 0)
print('1',f.tell()) #3
print(f.readlines()) #['国
', 'hello
', 'haha
', '
']
print('2',f.tell()) #19
f.writelines(l)
print('3',f.tell()) #37
res = f.readlines()
print('4',f.tell())#37
print(res) #[]
w+模式的模式 0:
with open('c.txt', mode='w+t', encoding='utf-8')as f:
l = ['11
','22
','33
']
f.writelines(l)
f.seek(2, 0)
res = f.readlines()
print(res) #['
', '22
', '33
']
a +模式的模式 0:
#文本:haha
with open('c.txt', mode='a+t', encoding='utf-8')as f:
l = ['中国
','hello
','haha
']
print('1',f.tell()) #5
print(f.readlines()) #[]
f.writelines(l)
print('2',f.tell()) #23
res = f.readlines()
print('3',f.tell())#23
print(res) #[]
f.seek(2, 0) #
print('4',f.tell()) # 2
print(f.readlines()) #['ha
', '中国
', 'hello
', 'haha
']
3、tail -f access.log程序实现
import time
with open('access.log', mode='rb')as f:
f.seek(0, 2)
print(f.tell())
while True:
res = f.readline()
print(res)
if res:
print(res.decode('utf-8'), end='')
else:
time.sleep(2)
print('xxxx')