I am having a problem with shelve......

[Fearx351]

I am new to python and am actually using python as a result of taking a computer science class in college. I am writing a program to fit a hypothetical scenario. Well I have ran into a problem..Please help me!

the traceback and snippet are below.

Code:

import shelve
 
    high_space = 3000
 
    file_sizeh = file_size * week_selec
    h_back = high_space - file_sizeh
    db = shelve.open("netback.dat")
    db['hremspace'] = h_back
    db.close()
    for h_back in hremspace != 3000 :
        print'There are ',db['hremspace'],' Mb\'s left in High priority storage'
        print'after your backup of ',file_sizeh,' Mb\'s'
        db['hremspace'] = h_back
        db['netback'] = back_name
        db['Highprofile'] = file_sizeh
    else:
        for h_back in db['hremspace'] > 0:
            print'There are ',db['hremspace'],' Mb\'s left in High priority storage'
            print'after your backup of ',file_sizeh,' Mb\'s'
            db['hremspace'] = h_back
            db['netback'] = back_name
            db['Highprofile'] = file_sizeh
        else:
            print'There is not enough space to save your backup.'
            print'Please delete a backup and try again.'

File "C:\Users\------\Desktop\finalprojbac.py", line 112, in high_Priority
for h_back in hremspace != 3000 :
NameError: global name 'hremspace' is not defined

[bvdet]

Line number 10 is the problem. The identifier hremspace has not been assigned to any value. The dictionary entry db['hremspace'] was assigned to h_back.

You have another problem on that line. Notice the TypeError:

>>> for item in (1,2,3,4,5) != 3000:
...     print item
...     
Traceback (most recent call last):
  File "<interactive input>", line 1, in ?
TypeError: iteration over non-sequence

Maybe you need something like this:

>>> for item in (1,2,3,4,5):
...     if item != 3000:
...         print item
...         
1
2
3
4
5
>>> 

[Fearx351]

oh ok I guess I was trying to compare a value to a key? I am new to this so its still a big learning process for me . Basically I am trying to check the entry to make sure that value isnt 3000 . The reason being,is that If I didnt 3000 would be assigned everytime the function was executed. Like I said I am new to this and I really couldnt think of any other way around this.

[dwblas]

Try printing first to understand what the dictionary is.

db = shelve.open("netback.dat")
print "hremspace value is", db['hremspace']
db['hremspace'] = 1000
print "hremspace value is now", db['hremspace'] 
x = 100
db['hremspace'] += x
print "hremspace value is now", db['hremspace'] 

print'There are ',db['hremspace'],' Mb\'s left in High priority storage'
print'after your backup of ',file_sizeh,' Mb\'s'

If you are trying to compute the size of the backup or space remaining please supply info on what you wish to do (and sample input data would help).

[Fearx351]

Basically what I want to do is have a set value(backup) and when the user inputs a specific backup. it will access the db and update and or subtract the necessary value.

I will post my current code just so you can get a better idea of what I am trying to do.

##Jeffrey Clark
##IT104
##Professor Brooker
##08/04/2010
##This program will create a network backup for user.
 
def main():
    ##Main Function
 
    get_Command()
 
def get_Command():
    ##Displays the Main Menu
 
    print'[]=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=[]'
    print'[]This program will create a network backup routine for the user.[]'
    print'[]=\=\=\=\=\=\=\=[]/=/=/=/=/=/=/=/=/=/=/=/=/=/=/[]=\=\=\=\=\=\=\=[]'                
    print'                 []..........Main Menu..........[]'
    print'                 []=\=\=\=\=\=\=\=\=\=\=\=\=\=\=[]'
    print'                 []1.Create a New Backup        []'
    print'                 []2.Remove a Backup Item       []'
    print'                 []3.View Current Backups       []'
    print'                 []4.Exit                       []'
    print'                 []=/=/=/=/=/=/=/=/=/=/=/=/=/=/=[]'
    get_Selection()
 
def get_Selection():
    ##Gets the users selection from the Menu
 
    print
    selection = input('Please make a selection from the Menu: ')
 
    if selection == 1:
        new_Backup()
    else:
        if selection == 2:
            rem_Backup()
        else:
            if selection == 3:
                readFile()
            else:
                if selection == 4:
                    exit_prog()
                else:
                    print'You have chosen an invalid Option'
                    get_Selection()
 
def new_Backup():
 
    global file_size
    global back_name
    ##Creates a new Backup for user
 
    back_name = raw_input('Please enter the name of the Backup: ')
    file_size = input('Please enter the size of the file you wish to backup in MB\'s:')
    net_week()
 
def net_week():
    ##
    global week_selec
 
    print''
    print'[]How often will the backup be backed up?[]'
    print'[]Make a selection 1-7'
    print'[]'
 
    week_selec = input('Please make a selection from Menu:')
    if week_selec <= 7:
        week_selec = week_selec
    else:
        print'The number you have chosen is out of range'
    file_Prior()
 
def file_Prior():
    ##
 
 
    print''
    print'[]What is the priority level of Backup?[]'
    print'[]1.High Priority'
    print'[]2.Medium Priority'
    print'[]3.Low Priority'
    prior_selec = input('Please make a selection from Menu:')
 
    if prior_selec == 1:
        high_Priority()
    else:
        if prior_selec == 2:
            prior_selec =  m_prior
            med_Priority()
        else:
            if prior_selec == 3:
                prior_selec =  l_prior
                low_Priority()
            else:
                print'You have made an invalid selection'
                file_prior()
 
def high_Priority():
    ##
    global file_sizeh
    print''
    import shelve
 
 
    high_space = 3000
    file_sizeh = file_size * week_selec
    h_back = high_space - file_sizeh
    db = shelve.open('netback.dat')
    db['hremspace'] = h_back
    db['netback'] = back_name
    db['Highprofile'] = file_sizeh
    print db.keys()
 
    if db['hremspace'] != 3000:
 
        print'There are ',db['hremspace'],' Mb\'s left in High priority storage'
        print'after your backup name:',db['netback'],'of',file_sizeh,' Mb\'s'
        db['hremspace'] = h_back
        db['netback'] = back_name
        db['Highprofile'] = file_sizeh
 
    else:
        for h_back in back_name > 0:
            print'There are ',db['hremspace'],' Mb\'s left in High priority storage'
            print'after your backup of ',file_sizeh,' Mb\'s'
            db['hremspace'] = h_back
            db['netback'] = back_name
            db['Highprofile'] = file_sizeh
        else:
            print'There is not enough space to save your backup.'
            print'Please delete a backup and try again.'
 
 
def med_Priority(file_sizem,):
    ##
    print''
    med_space = 5000
 
    file_sizem = file_size * week_selec
    m_back = med_space - file_sizem
 
    if m_back > 0 :
         print'There are ',m_back,' Mb\'s left in Medium priority storage'
         print'after your backup of ',file_sizem,' mb\s'
         write_File()
    else:
        print'There is not enough space to save your backup.'
        print'Please delete a backup and try again.'
 
    import shelve
    ldb = shelve.open("netbackl.dat")
    ldb['netback'] = back_name
    ldb['Medprofile'] = file_sizem
 
def low_Priority(file_sizel,):
    ##
    print''
    low_space = 9000
 
    file_sizel = file_size * week_selec
    l_back = low_space - file_sizel
 
    if l_back > 0 :
         print'There are ',l_back,' Mb\'s left in Low priority storage'
         print'after your backup of ',file_sizel,' Mb\s'
         write_File()
    else:
        print'There is not enough space to save your backup.'
        print'Please delete a backup and try again.'
 
    import shelve
    ldb = shelve.open("netbackl.dat")
    ldb['netback'] = back_name
    ldb['Lowprofile'] = file_sizel
 
def write_File():
    ##
 
    import shelve
    db = shelve.open("netback.dat")
    db['netback'] = back_name
    db['filesize'] = file_size
    print db.keys()
    try:
        print db['netback']
        print db['filesize']
    finally:
        db.close()
 
def readFile(db,):
    ##Opens file to read
    print'asd'
    try:
        print db['netback']
        print db['filesize']
    finally:
        db.close()
main()
 

I am sorry for the unorganized code I am a student and I am still learning.

[Fearx351]

bump....................