文件操作之增删改查应用

Posted 柳姑娘

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def delect():
‘删除一行信息‘
# m = www.oldboy2.org
while 1 :
flag = False
m = input(‘please input which url you want to delect:‘)
with open(‘haproxy.conf‘,encoding = ‘utf8‘) as f_read,open(‘delect‘,‘w‘,encoding = ‘utf8‘) as f_write:
for line in f_read:
if line.startswith(‘backend‘)and m in line :
flag = True
continue
if line.startswith(‘backend‘) and flag :
flag = False
if flag :
continue
f_write.write(line)
if m == ‘q‘:
exit()
def select():
‘查找一行信息‘
#m = www.oldboy2.org
while 3:
m = input(‘please input which url you want to selet:‘)
l = []
flag = False
with open(‘haproxy.conf‘, encoding=‘utf8‘)as f_read:
for line in f_read:
if line.startswith(‘backend‘) and m in line:
flag = True
continue
if line.startswith(‘backend‘) and flag:
flag = False

if flag:
l.append(line.strip())

for i in l:
print(i)
if m == ‘q‘:
exit()
def insert():
‘增加一些信息‘
while 1:
url = input (‘please input the url‘)
ttt = input(‘please input what you what to insert:‘)
with open(‘haproxy.conf‘, encoding=‘utf8‘)as f_read,open(‘insert‘,‘a‘,encoding = ‘utf8‘)as f_write:
for line in f_read:
if line.startswith(‘backend‘) and url in line:
f_write.write(line)
f_write.write(‘\t\t‘+ttt+‘\n‘)
else:
f_write.write(line)
if url == ‘q‘:
exit()
def change():
‘改变某一行的信息‘
l = []
flag = True
while 1:
url = input (‘please input the url:‘)
with open(‘haproxy.conf‘, encoding=‘utf8‘)as f_read:
for line in f_read:

if line.startswith(‘backend‘) and url in line:
flag = False
continue
if line.startswith(‘backend‘) and flag == False:
flag = True
if flag == False:
l.append(line.strip())
print(l)
ttt = input(‘please input what you what to change:‘)
ccc = input(‘please input what you want to write:‘)
l[l.index(ttt)]= ccc
with open(‘haproxy.conf‘, encoding=‘utf8‘)as f_read,open(‘change‘, ‘a‘, encoding=‘utf8‘)as f_write:
for line in f_read:

if ttt in line:
f_write.write(ccc+‘\n‘)
continue
f_write.write(line)
if url == ‘q‘:
exit()
def tell_msg():
print("""
********************
删除 : delect
查找 : select
增加 : insert
改变 : change
********************
""" )
msg = {
‘delect‘:delect,
‘select‘:select,
‘insert‘:insert,
‘change‘:change
}
def main():
tell_msg()
m = input(‘please input your choice:‘)
msg[m]()
if m == ‘q‘:
exit()
main()

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