Def the update () :

F=open (' student. TXT ', 'r', encoding="utf-8")

Phone=f.r ead ()

Phone=eval (phone)

Print (phone)

F. lose ()

Print (' file read successful ')

Return phone


Phones=update ()

Def write (info) :

F=open (' student. TXT ', 'w', encoding="utf-8")

F.w rite (STR (info))

F. lose ()

Print (' synchronization has been finished)

While True:

Print (' this is a mobile phone management system ')

Print (' 1. Check the inventory mobile phone brands')

Print (' 2. The stock ')

Print (' 3. Shipment)

Print (' 4. Modify the inventory information ')

Print (' 5. Delete mobile phone brands')

Print (' 6. Exit ')

Option=eval (input (' please enter you want to do))

If the option==1:

For phone in phones:

Print (phone)

If the option==2:

Name=input (" please enter the mobile phone brand)

Num=eval (input (' please enter the deposit amount))

For phone in phones:

If the name in the phone. The keys () :

Total=phone [name] + num

Phone [name]=total

Break

The else:

Phones. Append ({name: num})

Print (phones)

Write (phones)

If the option==3:

Name=input (' please enter take mobile phone brands')

Num=eval (input (' please enter the number '))

For phone in phones:

If the name in the phone. The keys () :

If num & lt;=phone [name] :

Total=phone [name] - num

Phone [name]=total

Write (phones)

Print (' please find ')

The else:

Print (' insufficient inventory)

The else:

Print (' the phone does not exist ')

If the option==4:

Name=input (" please enter the mobile phone brand)

Num=eval (input (' please enter the number '))

For phone in phones:

If the name in the phone. The keys () :

Phone [name]=num

Write (phones)

Break

The else:

Print (' the brand does not exist ')

If the option==5:

Name=input (" please enter the mobile phone brand)

For phone in phones:

If the name in the phone. The keys () :

Phones. Remove (phone)

Write (phones)

Break

The else:

Print (' no ')

If the option==6:

Print (' withdrawn ')

Break