1、编写文件修改功能,调用函数时,传入三个参数(修改的文件路径,要修改的内容,修改后的内容)既可完成文件的修改
import os
def file(src_fiule, old_content, new_content):
with open(r'{}'.format(src_fiule), 'rb') as rf,
open(r'{}.swap'.format(src_fiule), 'wb') as wf:
while True:
res = rf.readline().decode('utf-8')
if old_content in res:
data = res.replace('{}'.format(old_content), '{}'.format(new_content))
wf.write(bytes('{}'.format(data), encoding='utf-8'))
else:
wf.write(bytes('{}'.format(res), encoding='utf-8'))
if len(res) == 0:
break
os.remove(r'{}'.format(src_fiule))
os.rename('{}.swap'.format(src_fiule), '{}'.format(src_fiule))
return '修改成功'
if __name__ == '__main__':
inp_src = input("请输入文件路径:").strip()
old_content = input("请输入要修改的内容:").strip()
new_content = input("请输入修改后的内容:").strip()
if inp_src and old_content and new_content:
msg = file(inp_src, old_content, new_content)
print(msg)
else:
print("修改失败")
2、编写tail工具
import time
def tail():
with open("log.txt","rb") as f:
f.seek(0,2)
while True:
new_msg = f.readline()
if len(new_msg)==0:
time.sleep(1)
else:
print(new_msg.decode("utf-8"))
tail()
#另一个文件
def write_log():
with open("log.txt","a",encoding="utf-8") as f:
msg = input("请输入日志内容")
f.write(f"
{msg}")
write_log()
3、编写登录功能
def login(inp_u, inp_p):
with open(r'db.txt', 'rt', encoding='utf-8') as f:
for line in f:
user, pwd = line.strip().split(':')
if inp_u == user and inp_p == pwd:
print("登录成功")
break
else:
print("用户名密码错误")
if __name__ == '__main__':
inp_u = input("用户名:").strip()
inp_p = input("密码:").strip()
login(inp_u, inp_p)
4、编写注册功能
def register(inp_u, inp_p):
with open(r'db.txt', 'a+t', encoding='utf-8') as f:
f.seek(0, 0)
for line in f:
user, *_ = line.strip().split(':')
if inp_u == user:
print("用户名已存在")
break
else:
f.write('{}:{}
'.format(inp_u, inp_p))
if __name__ == '__main__':
inp_u = input("用户名:").strip()
inp_p = input("密码:").strip()
register(inp_u, inp_p)
5、编写用户认证功能
def login():
inp_u = input("用户名:").strip()
inp_p = input("密码:").strip()
with open(r'db.txt', 'rt', encoding='utf-8') as f:
for line in f:
user, pwd = line.strip().split(':')
if inp_u == user and inp_p == pwd:
print("登录成功")
return True
else:
print("用户名密码错误")
return False
def check_user(user_check):
if user_check:
print("有趣的功能")
else:
print("请先登录")
def main():
user_check = False
msg = """
1、登录
2、有趣的功能
"""
tag = True
dic = {
'1': True,
'2': False
}
while tag:
print(msg)
num = input("请输入编号:").strip()
if not num.isdigit() and num not in dic:
print("必须输入指定编号")
else:
if dic[num]:
user_check = login()
else:
check_user(user_check)
if __name__ == '__main__':
main()