功能类似于收银员,实现食物买卖时存量的增减,可查询食物种类列表,单种食物的存量,总览全部食物的存量。
#!/usr/bin/python
#Filename: bscsystem
import pickle
import commands
import os
if not os.path.exists(’list'):
os.mknod("list")
print 'mkdir "list"'
if commands.getoutput('wc -l list')=='0 list':
an={}
fn=open("list","wb")
pickle.dump(an,fn)
fn.close()
f=open("list","rb")
content=pickle.load(f)
f.close()
while True:
answer=raw_input('show:h check:c buy:b sell:s all:a del:d exit:e \n')
if answer=='h':
for key in content.keys():
print key,
elif answer=='c':
answer=raw_input('which food you want to check?\n')
if content.has_key(answer):
print 'The number of "%s" is "%s"'%(answer,content[answer])
else:
print 'No such food'
elif answer=='b':
na=raw_input('which food?\n')
nu=int(raw_input('how many foods?\n'))
if content.has_key(na):
content[na]=content[na]+nu
print 'The number of "%s" is "%s"'%(answer,content[answer])
else:
content[na]=nu
elif answer=='s':
na=raw_input('which food?\n')
nu=int(raw_input('how many foods?\n'))
if content.has_key(na):
content[na]=content[na]-nu
print 'The number of "%s" is "%s"'%(answer,content[answer])
else:
print 'no such food\n'
elif answer=='e':
break
elif answer=='a':
print content
elif answer=='d':
na=raw_input('which food you want to delete?\n')
if content.has_key(na):
del content[na]
print '"%s" is deleted'%na
else:
print 'no such food'
else:
print 'unknow command'
f2=open("list","wb")
pickle.dump(content,f2)
f2.close()